Front view of human nose
Cross-section of the interior of a nose
|Artery||sphenopalatine artery, greater palatine artery|
|Nerve||external nasal nerve|
The human nose is the most protruding part of the face that bears the nostrils and is the first organ of the respiratory system. The nose is also the principal organ in the olfactory system. The shape of the nose is determined by the nasal bones and the nasal cartilages, including the nasal septum which separates the nostrils and divides the nasal cavity into two. On average the nose of a male is larger than that of a female.
The main function of the nose is respiration, and the nasal mucosa lining the nasal cavity and the paranasal sinuses carries out the necessary conditioning of inhaled air by warming and moistening it. Nasal conchae, shell-like bones in the walls of the cavities play a major part in this process. Filtering of the air by nasal hair in the nostrils prevents large particles from entering the lungs. Sneezing is a reflex to expel unwanted particles from the nose that irritate the mucosal lining. Sneezing can transmit infections, because aerosols are created in which the droplets can harbour pathogens.
Another major function of the nose is olfaction, the informing of odours that the sense of smell carries out. The area of olfactory epithelium, in the upper nasal cavity contains specialised olfactory cells responsible for this function.
There are many plastic surgery procedures on the nose, known as rhinoplasties available to correct various structural defects or to change the shape of the nose. Defects may be congenital, result from nasal disorders or from trauma and these are carried out by reconstructive surgery. Procedures used to change a nose shape electively are carried out by cosmetic surgeries.
- 1 Structure
- 2 Blood supply and drainage
- 3 Nerve supply
- 4 Development
- 5 Function
- 6 Clinical significance
- 7 Society and culture
- 8 Evolutionary hypotheses
- 9 Neoteny
- 10 See also
- 11 References
- 12 External links
Several bones and nasal cartilages make up the bony-cartilaginous framework of the nose, and the internal structure. The nose is also made up of types of soft tissue such as skin, epithelia, mucous membrane, muscles, nerves, and blood, and in the skin there are sebaceous glands.
The framework of the nose is made up of bone and cartilage which provides strong protection for the internal structures of the nose. The arrangement of the cartilages allows flexibility through muscle control to enable airflow to be modified.
The nasal part of the frontal bone ends in a serrated nasal notch that articulates at the front with the paired nasal bones, and at the sides with the small lacrimal bones and with the frontal process of each maxilla. The nasal bones in the upper part of the nose are joined together by the midline internasal suture. They join with the septal cartilage at a junction known as the rhinion. The rhinion is the midpoint of the internasal suture at the join with the cartilage, and from the rhinion to the apex, or tip, the framework is of cartilage.
Above and to the back, the bony upper part of the nasal septum is made up of the perpendicular plate of the ethmoid bone, and the bony lower part is made up of the vomer bone that lies below. The floor of the nose is made up of the incisive bone and the horizontal plates of the palatine bones, and this makes up the hard palate of the roof of the mouth. The two horizontal plates join together at the midline and form the posterior nasal spine that gives attachment to the musculus uvulae in the uvula.
The internal roof of the nasal cavity is composed of the horizontal, perforated cribriform plate of the ethmoid bone through which pass sensory fibers of the olfactory nerve (CN1). Below and behind the cribriform plate, sloping down at an angle, is the face of the sphenoid bone.
The two maxilla bones join at the base of the nose at the lower nasal midline between the nostrils, and at the top of the philtrum to form the anterior nasal spine. This thin projection of bone holds the cartilaginous center of the nose.
The septal nasal cartilage, extends from the nasal bones in the midline, to the bony part of the septum in the midline, posteriorly. It then passes along the floor of the nasal cavity. The septum is quadrangular; the upper half is atttached to the two lateral nasal cartilages which are fused to the dorsal septum in the midline, and laterally attached, with loose ligaments, to the bony margin of the anterior nasal aperture, while the inferior ends of the lateral cartilages are free (unattached); the minor alar cartilages are adjacent to the lateral cartilages in the fibroareolar connective tissue.
Beneath the lateral cartilages lay the major alar cartilages, which swing outwards, from medial attachments, to the caudal septum in the midline (the medial crura) to an intermediate crus (shank) area. Finally, the major alar cartilages flare outwards, above and to the side (superolaterally), as the lateral crura; these cartilages are mobile, unlike the upper lateral cartilages. Furthermore, some persons present anatomical evidence of nasal scrolling—i.e. an outward curving of the lower borders of the upper lateral-cartilages, and an inward curving of the cephalic borders of the alar cartilages.
The nasal root is the top of the nose that attaches the nose to the forehead. The nasal root is above the bridge and below the glabella, forming an indentation known as the nasion at the frontonasal suture where the frontal bone meets the nasal bones.
The nasal ridge (nasal dorsum) is the border between the root and the tip of the nose which in profile can be variously shaped.
The skin of the nose varies in thickness along its length. From the glabella to the bridge the skin is thick, fairly flexible, and mobile. It tapers to the bridge where it is thinnest and least flexible as it adheres to the bony framework. The rest of the skin of the lower nose is as thick as the top section and has more sebaceous glands. The glands produce sebum in a higher concentration than on other parts of the body.
The nasal cavity is the large internal space of the nose. The cavity is divided into two cavities (fossae) by the nasal septum, which separates the nostrils. The division into two fossae enables the functioning of the nasal cycle that slows down the air conditioning process. The nasal vestibule is the frontmost part of the nasal cavity, and is enclosed by cartilages. On the lateral wall of each cavity are three shell-like bones called conchae, arranged as superior, middle, and inferior conchae. Below each concha is a corresponding superior, middle, and inferior nasal meatus. The conchae are also known as turbinates. Sometimes when the superior concha is narrow, a fourth supreme nasal concha is present situated above and sharing the space with the superior concha. The conchae extend along the length of the nasal cavity.
The internal structures and cavities, including the conchae and paranasal sinuses form an integrated system for the conditioning (moistening and warming) and filtering of the air breathed in through the nose. This functioning also includes the major role of the nasal mucosa, and the resulting conditioning of the air before it reaches the lungs is important in maintaining the internal environment and proper functioning of the lungs. The turbulence created by the conchae and meatuses optimises the warming, moistening, and filtering of the mucosa. A major protective role is thereby provided by these structures of the upper respiratory tract, in the passage of air to the more delicate structures of the lower respiratory tract.
At the back of the nasal cavity there are two openings, one from each fossa, called choanae that give entrance to the nasopharynx and rest of the respiratory tract. The choanae are also called the posterior nostrils.
There is a nasal valve area in the nose that is responsibe for providing resistance to the flow of air. This enables increased warming and moistening of the air. Two valves are often referred to for this area, an internal nasal valve and an external nasal valve. The internal nasal valve is the narrowest part of the airway. The internal nasal valve is in the middle third of the nose and the external nasal valve is in the alar wall. The angle between the septum and the sidewall needs to be sufficient for unobstructed airflow.
The vestibule of the nose is lined with skin. A mucous ridge known as the limen nasi separates the vestibule from the rest of the nasal cavity and marks the change from the skin of the vestibule to the respiratory epithelium of the rest of the nasal cavity. This area is also known as a mucocutaneous junction that has a dense microvasculature. The respiratory epithelium is a ciliated tissue with mucus-secreting goblet cells, that maintains the nasal moisture and protects the respiratory tract from infection and atmospheric particulates. The respiratory epithelium also covers the paranasal sinuses. This lining of the sinuses is closely adhered to the membrane of the underlying bone and is referred to as mucoperiosteum.
There are narrow openings called sinus ostia from the paranasal sinuses that allow drainage into the nasal cavity. Adults have a high concentration of cilia in the ostia. The increased cilia and the narrowness of the sinus openings allow for an increased time for moisturising, and warming. The cilia in the sinuses beat towards the openings into the nasal cavity. Most of the ostia open into the middle meatus and the anterior ethmoid, that together are termed the osteomeatal complex. The maxillary sinus is the largest of the sinuses and drains into the middle meatus.
The shape of the nose varies widely due to differences in the nasal bone shapes and formation of the bridge of the nose. Some nose shapes were classified for surgeries by Eden Warwick in Nasology 1848:
Class I. The aquiline nose.
Other terms are used to describe the shape of the nose, and can also include a reference to the nasal index used to classify ethnicity: Leptorrhine describes a long, narrow nose. Hyperleptorrhine is a very long, narrow nose with a nasal index of 40 to 55. Platyrrhine is a short, broad nose. Paul Topinard developed the nasal index for studies in India. The nasal index is the ratio of the width of the nose to the nasal height. Some of the types used in Nasology are also used by Topinard. He took narrow shapes as in 1-5 to be European; medium width shape 6 were "yellow races"; broad nose shape 7 were African, and broad nose shape 8 were taken to be Melanesian and Australian Aboriginal.
Some deformities of the nose are named, such as the pug nose and the saddle nose. The pug nose is characterised by excess tissue from the apex that is out of proportion to the rest of the nose. A low and underdeveloped nasal bridge may also be evident. A saddle nose is mostly associated with trauma to the nose but can be caused by other conditions such as cocaine abuse and leprosy.
Some birth defects such as Down syndrome commonly present a small nose with a flattened nasal bridge. This can be due to the absence of one or both nasal bones, shortened nasal bones, or nasal bones that have not fused in the midline.
The movements of the nose are controlled by groups of facial and neck muscles that are set deep to the skin. There are four interconnected groups connected by the superficial fascia that covers, invests and forms the terminations of the muscles.
The compressor muscle group includes the transverse nasalis muscle.
The dilator muscle group includes the dilator naris muscle that expands the nostrils; it is in two parts: (i) the dilator naris anterior muscle, and (ii) the dilator naris posterior muscle.
Blood supply and drainage
- Internal carotid
The main branches from the interior carotid are the anterior ethmoidal artery, and the posterior ethmoidal artery that supplies the septum, and these derive from the ophthalmic artery. One of the terminal branches of the ophthalmic artery is the dorsal nasal artery which divides into two branches. One branch crosses the root of the nose and joins with the angular artery, and the other branch joins with the lateral nasal branch of facial artery which supplies the nasal ridge and alae.
- External carotid
The lateral walls of the nasal cavity and the septum are suppled by the sphenopalatine artery, and by the anterior and posterior ethmoid arteries. There is additional supply from the superior labial artery and the greater palatine artery.
The nasal ridge is supplied by branches of the internal maxillary artery (infraorbital) and the ophthalmic arteries from the common carotid artery system.
Veins of the nose include the angular vein that drains the side of the nose, receiving lateral nasal veins from the alae. The angular vein joins with the superior labial vein. Some small veins from the nasal ridge (dorsum) drain to the nasal arch of the frontal vein at the root of the nose.
In the posterior region of the cavity, specifically in the posterior part of the inferior meatus is a venous plexus known as Woodruff's plexus. This plexus is made up of large thin-walled veins with little soft tissue such as muscle or fiber. The mucosa of the plexus is thin with very few structures.
The nasal part of the lymphatic system arises from the superficial mucosa, and drains posteriorly to the retropharyngeal lymph nodes, and anteriorly to either the upper deep cervical lymph nodes (in the neck), or to the submandibular glands (in the lower jaw), or into both the nodes and the glands of the neck and the jaw.
- Ophthalmic innervation
- Nasociliary nerve – conveys sensation to the skin area of the nose, and the mucous membrane of the anterior (front) nasal cavity.
- Anterior ethmoid nerve – conveys sensation in the anterior (front) half of the nasal cavity: (a) the internal areas of the ethmoid sinus and the frontal sinus; and (b) the external areas, from the nasal tip to the rhinion: the anterior tip of the terminal end of the nasal-bone suture.
- Posterior ethmoid nerve – serves the superior (upper) half of the nasal cavity, the sphenoids, and the ethmoids.
- Intratrochlear nerve – conveys sensation to the medial region of the eyelids, the palpebral conjunctiva, the nasion (nasolabial junction), and the bony dorsum.
- Maxillary innervation
- Maxillary nerve – conveys sensation to the upper jaw, the face and the nostrils.
- Internal nasal branches of infraorbital nerve – conveys sensation to the septum.
- Zygomatic nerve – through the zygomatic bone and the zygomatic arch, conveys sensation to the cheekbone areas.
- Sphenopalatine nerve – divides into the lateral branch and the septal branch, and conveys sensation from the rear and the central regions of the nasal cavity.
The supply of parasympathetic nerves to the face and the upper jaw (maxilla) derives from the greater superficial petrosal (GSP) branch of cranial nerve VII, the facial nerve. The GSP nerve joins the deep petrosal nerve (of the sympathetic nervous system), derived from the carotid plexus, to form the vidian nerve (in the vidian canal) that traverses the pterygopalatine ganglion (an autonomic ganglion of the maxillary nerve), wherein only the parasympathetic nerves form synapses, which serve the lacrimal gland and the glands of the nose and of the palate, via the (upper jaw) maxillary division of cranial nerve V, the trigeminal nerve.
At four weeks, gestational age, the neural crest cells (the precursors of the nose) begin their caudal migration (from the posterior) towards the midface. Two symmetrical nasal placodes (the future olfactory epithelium) develop inferiorly. In the sixth week they invaginate to form two nasal pits. The nasal pits then divide into the medial and the lateral nasal processes (the future upper lip and nose). The medial processes then form the septum, the philtrum, and the premaxilla of the nose; the lateral processes form the sides of the nose; and the mouth forms from the stomodeum (the anterior ectodermal portion of the alimentary tract), which is inferior to the nasal complex.
A nasobuccal membrane separates the mouth from the nose; respectively, the inferior oral cavity (the mouth) and the superior nasal cavity (the nose). As the nasal pits deepen, said development forms the choanae, the two openings that connect the nasal cavity and the nasopharynx (upper part of the pharynx that is continuous with the nasal passages). Initially, primitive-form choanae develop, which then further develop into the secondary, permanent choanae.
At ten weeks, the cells differentiate into muscle, cartilage, and bone. Problems at this stage of development can cause birth defects such as choanal atresia (absent or closed passage), facial clefts and nasal dysplasia (faulty or incomplete development) or extremely rarely polyrrhinia the formation of a duplicate nose.
The nose is the first organ of the upper respiratory tract in the respiratory system, and its main function is the supply and conditioning of inhaled air to the lungs. The nose is responsible for warming and moistening the air and providing its passage to the rest of the respiratory tract. Another function is to filter the air by removing particulates. The three positioned nasal conchae in each cavity provide four grooves as air passages, along which the air is circulated and moved to the nasopharynx.
Nasal hair in the nostrils traps large particles preventing their entry into the lungs. Sneezing is an important reflex initiated by irritation of the nasal mucosa to expel unwanted particles through the mouth and nose. Photic sneezing is a reflex brought on by different stimuli such as bright lights.
The nose also plays the major part in the olfactory system. It contains an area of specialised cells, olfactory receptor neurons responsible for the sense of smell. The nasal conchae also help in olfaction function, by directing air-flow to the olfactory region.
Normal speech is produced with pressure from the lungs. This can be modified using airflow through the nose in a process called nasalisation. This involves the lowering of the soft palate to produce nasal vowels and consonants by allowing air to escape from both the nose and the mouth. Nasal airflow is also used to produce a variety of nasal clicks called click consonants. The paranasal sinuses act as sound chambers in vocal resonation.
One of the most common medical conditions involving the nose are nosebleeds (epistaxes). Most of them occur in Kiesselbach's plexus, a vascular plexus involving four arteries. Another common condition is nasal congestion, usually a symptom of infections or other inflammations of the nasal lining (rhinitis), such as in allergic rhinitis or vasomotor rhinitis (resulting from nasal spray abuse). Most of these conditions also cause anosmia, which is the medical term for a loss of smell. This may also occur in other conditions, for example following trauma, in Kallmann syndrome or Parkinson's disease.
Because of the special nature of the blood supply to the human nose and surrounding area, it is possible for retrograde infections from the nasal area to spread to the brain. For this reason, the area from the corners of the mouth to the bridge of the nose, including the nose and maxilla, is known as the danger triangle of the face.
Specific systemic diseases, infections or other conditions that may result in destruction of part of the nose (for example, the nasal bridge, or nasal septal perforation) are rhinophyma, skin cancer (for example, basal cell carcinoma), granulomatosis with polyangiitis, systemic lupus erythematosus, rheumatoid arthritis, tuberculosis, syphilis, leprosy and exposure to cocaine, chromium or toxins. The nose may be stimulated to grow in acromegaly.
A common anatomic variant is an air-filled cavity within a concha known as a concha bullosa. In rare cases a polyp can form inside a bullosa. Usually a concha bullosa is small and without symptoms but when large can cause obstruction to sinus drainage.
Chronic nasal obstruction resulting in breathing through the mouth can greatly impair or prevent the nostrils from flaring. One of the causes of snoring is nasal obstruction, and anti-snoring devices such as a nasal strip help to flare the nostrils and keep the airway open. The surgical procedure to correct breathing problems due to disorders in the nasal structures is called a rhinoplasty, and this is also the procedure used for a cosmetic surgery when it is commonly called a "nose job". For surgical procedures of rhinoplasty the nose is mapped out into a number of subunits and segments. This uses nine aesthetic nasal subunits and six aesthetic nasal segments. A septoplasty is the specific surgery to correct a nasal septum deviation.
Society and culture
Nose-picking is a common, mildly taboo habit. Medical risks include the spread of infections, nosebleeds and, rarely, perforation of the nasal septum. When it becomes compulsive it is termed rhinotillexomania. The wiping of the nose with the hand, commonly referred to as the "allergic salute", is also mildly taboo and can result in the spreading of infections as well. Habitual as well as fast or rough nose wiping may also result in a crease (known as a transverse nasal crease or groove) running across the nose, and can lead to permanent physical deformity observable in childhood and adulthood.
In certain Asian countries such as China, Japan, South Korea, Malaysia, Thailand and Bangladesh rhinoplasty is common to create a more developed nose bridge or "high nose". Similarly, "DIY nose lifts" in the form of re-usable cosmetic items have become popular and are sold in many Asian countries such as China, Japan, South Korea, Taiwan, Sri Lanka and Thailand. A high-bridged nose has been a common beauty ideal in many Asian cultures dating back to the beauty ideals of ancient China and North India.
Clive Finlayson of the Gibraltar Museum said the large Neanderthal noses were an adaption to the cold, Todd C. Rae of the American Museum of Natural History said primate and arctic animal studies have shown sinus size reduction in areas of extreme cold rather than enlargement in accordance with Allen's rule. Therefore, Todd C. Rae concludes that the design of the large and prognathic Neanderthal nose was evolved for the hotter climate of the Middle East and Africa and remained unchanged when they entered Europe 
Miquel Hernández of the Department of Animal Biology at the University of Barcelona said the "high and narrow nose of Eskimos" and "Neanderthals" is an "adaption to a cold and dry environment", since it contributes to warming and moisturizing the air and the "recovery of heat and moisture from expired air".
Stephen Jay Gould has noted that larger noses are less neotenous, especially the large Grecian nose. Women have smaller noses than men due to not having increased secretion of testosterone in adolescence. Smaller noses, along with other neotenous features such as large eyes and full lips, are generally considered more attractive on women. Werner syndrome, a condition that causes the appearance of premature aging, causes a "bird-like" appearance due to pinching of the nose while, conversely, Down syndrome, a neotenizing condition, causes a flattening of the nose.
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