Free nerve ending
|Free nerve ending|
|Latin||terminatio neuralis libera|
A free nerve ending (FNE) is an unspecialized, afferent nerve ending, meaning it brings information from the body's periphery toward the brain. They function as cutaneous receptors and are essentially used by vertebrates to detect pain.
Free nerve endings are unencapsulated and have no complex sensory structures, unlike those found in Meissner's or Pacinian corpuscles. They are the most common type of nerve ending, and are most frequently found in the skin. They mostly resemble the fine roots of a plant. They penetrate the epidermis and end in the stratum granulosum. FNE infiltrate the middle layers of the epidermis and surround hair follicles.
Rate of adaption 
Free nerve endings can detect temperature, mechanical stimuli (touch, pressure, stretch) or pain (nociception). Thus, different free nerve endings work as thermoreceptors, cutaneous mechanoreceptors and nociceptors. In other words, they express polymodality.
Fiber types 
- MacIver M, Tanelian D (1993). "Free nerve ending terminal morphology is fiber-type-specific for A delta and C fibers innervating rabbit corneal epithelium". J Neurophysiol 69 (5): 1779–83. PMID 8509835.
- Hada R (1990). "[Difference in responses of free nerve endings and Ruffini-type endings innervating the cat mandibular periosteum to square wave pressure stimuli, ramp mechanical stimuli and triangular vibrations]". Shikwa Gakuho 90 (2): 161–80. PMID 2135092.
- Textbook in Medical Physiology And Pathophysiology: Essentials and clinical problems. Copenhagen Medical Publishers. 1999 - 2000
- Cleland C, Hayward L, Rymer W (1990). "Neural mechanisms underlying the clasp-knife reflex in the cat. II. Stretch-sensitive muscular-free nerve endings". J Neurophysiol 64 (4): 1319–30. PMID 2258749.
- Somatosensory System from Dr. Daley of North Carolina Wesleyan College.