Foramen rotundum

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Foramen rotundum of Sphenoid
Gray145.png
Sphenoid bone. Upper surface. (Foramen rotundum labeled at center left)
Foramen rotundum.png
Base of the skull. Upper surface. Sphenoid is yellow, and arrows indicate the foramen rotundum.)
Details
Latin foramen rotundum ossis sphenoidalis
Identifiers
Gray's p.150
Dorlands
/Elsevier
f_12/12373564
TA A02.1.05.035
FMA FMA:53154
Anatomical terms of bone

The foramen rotundum is a circular hole in the sphenoid bone that connects the middle cranial fossa and the pterygopalatine fossa.

Structure[edit]

The foramen rotundum is one of the several circular apertures (the foramina) located in the base of the skull, in the anterior and medial part of the sphenoid bone.

The mean area of the foramina rotunda is not considerable, which may suggest that they play a minor role in the dynamics of blood circulation in the venous system of the head.[1]

Development[edit]

The foramen rotundum evolves in shape throughout the fetal period, and from birth to adolescence. It achieves a perfect ring-shaped formation in the fetus after the 4th fetal month. It is mostly oval-shaped in the fetal period, and round-shaped after birth (generally speaking). After birth, the rotundum is about 2.5 mm and in 15- to 17-year olds about 3 mm in length. The average diameter of the foramen rotundum in adults is 3.55 mm. This was according to a developmental study published in The Hokkaido Journal of Medical Science on the foramen ovale, the foramen spinosum and the foramen rotundum, and according to a study about the postnatal enlargement of the foramina rotundum, ovale and spinosum and their topographical changes published in the Anatomischer Anzeiger.[2][3]

Function[edit]

The maxillary nerve passes through and exits the skull via the pterygopalatine fossa and the foramen rotundum.

The foramen rotundum contains the maxillary branch (V2) of trigeminal cranial nerve (CN V).

History[edit]

Etymology[edit]

Foramen is the Latin term designating a hole-like opening. It derives from the Latin forare meaning to bore or perforate. Here, the opening is round as indicated by the Latin rotundum meaning round.

Additional images[edit]

See also[edit]

References[edit]

This article incorporates text from a public domain edition of Gray's Anatomy.

  1. ^ Reymond J, Charuta A, Wysocki J (2005). "The morphology and morphometry of the foramina of the greater wing of the human sphenoid bone". Folia Morphologica 64 (3): 188–93. PMID 16228954. 
  2. ^ Yanagi S (1987). "Developmental studies on the foramen rotundum, foramen ovale and foramen spinosum of the human sphenoid bone". The Hokkaido Journal of Medical Science 62 (3): 485–96. PMID 3610040. 
  3. ^ Lang J, Maier R, Schafhauser O (1984). "Postnatal enlargement of the foramina rotundum, ovale et spinosum and their topographical changes". Anatomischer Anzeiger 156 (5): 351–87. PMID 6486466. 

External links[edit]