Meissner's corpuscle

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Meissner's corpuscles (discovered by the anatomist Georg Meissner (1829-1903)) are a type of mechanoreceptor and more specifically, a tactile corpuscle (corpusculum tactus). They are distributed throughout the skin, but concentrated in areas especially sensitive to light touch, such as the fingertips, palms, soles, lips, tongue, face and the skin of the male and female genitals. They are primarily located just beneath the epidermis within the dermal papillae.

Meissner's corpuscles are encapsulated unmyelinated nerve endings, which consist of flattened supportive cells arranged as horizontal lamellae surrounded by a connective tissue capsule. A single nerve fiber meanders between the lamellae and throughout the corpuscle. Any physical deformation in the corpuscle will cause an action potential in the nerve. Since they are rapidly adapting or phasic, the action potentials generated quickly decrease and eventually cease. If the stimulus is removed, the corpuscle regains its shape and while doing so (ie: while physically reforming) causes another volley of action potentials to be generated. (This is the reason one stops "feeling" one's clothes.) Because of their superficial location in the dermis, these corpuscles are particularly sensitive to touch and vibrations, but for the same reasons, they are limited in their detection because they can only signal that something is touching the skin. Feelings of deep pressure (from a poke, for instance) are generated from Pacinian corpuscles (the only other type of phasic tactile mechanoreceptor), which are located deeper in the dermis, and some free nerve endings. Also, Meissner's corpuscles do not detect pain; this is signalled exclusively by free nerve endings.

[edit] External links

• Donald L. Rubbelke D.A. Tissues of the Human Body: An Introduction. McGraw-Hill. 1999 Meissner's and Pacinian corpuscles
• Dawn A. Tamarkin, Ph.D. Anatomy and Physiology Unit 15 Vision and Somatic Senses: Touch and Pressure
• S Gilman. Joint position sense and vibration sense: anatomical organisation and assessment. Journal of Neurology Neurosurgery and Psychiatry 2002;73:473-477

This box: view • talk • edit Nervous system, receptors: somatosensory system
Medial lemniscus: Touch/mechanoreceptors: Pacinian corpuscles - Meissner's corpuscles - Merkel's discs - Ruffini endings - Free nerve endings - Hair cells - Baroreceptor Proprioception: Golgi organ - Muscle spindle (Intrafusal muscle fiber) Spinothalamic tract: Pain: Nociceptors Temperature: Thermoreceptors

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fr:Corpuscule de Meissner pt:Corpúsculo de Meissner ru:Тельце Мейснера

This page uses content from the English-language version of Wikipedia. The original article was at Meissner's corpuscle. The list of authors can be seen in the page history. As with Psychology Wiki, the text of Wikipedia is available under the GNU Free Documentation License.