Hellow guys, Welcome to my website, and you are watching Live Surgery: Hand Anatomy - What is a Pacinian (Lamellar) Corpuscle?. and this vIdeo is uploaded by Dr Thomas McClellan at 2015-10-22T07:39:49-07:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.
| Name | Live Surgery: Hand Anatomy - What is a Pacinian (Lamellar) Corpuscle? |
| Video Uploader | Video From Dr Thomas McClellan |
| Upload Date | This Video Uploaded At 22-10-2015 14:39:49 |
| Video Discription | www.MPSurgery.com www.Hnad411.com What is a Pacinian Corpuscle? Mechanoreceptors are specialized structures that provide information to the central nervous system about touch, pressure, vibration, and cutaneous tension. There are four main types of mechanorecptors located within the hand; Meissner’s corpuscles, Pacinian corpuscles, Merkel’s disks, and Ruffini’s corpuscles Pacinian corpuscles make up 10–15% of the cutaneous receptors in the hand. These structures are nerve endings in the skin responsible for sensitivity to vibration and pressure. They respond only to sudden disturbances and are especially sensitive to vibration. The vibrational role may be used to detect surface texture, e.g., rough vs. smooth. Pacinian corpuscles act as very rapidly adapting mechanoreceptors. Groups of corpuscles respond to pressure changes, e.g. on grasping or releasing an object. The Pacinian corpuscle is oval-shaped and approximately 2 mm in length. The entire corpuscle is wrapped by a layer of connective tissue. It has 20 to 60 concentric lamellae composed of fibrous connective tissue and fibroblasts, separated by gelatinous material. The lamellae are very thin, flat, modified Schwann Cells. In the center of the corpuscle is the inner bulb, a fluid-filled cavity with a single afferent unmyelenated nerve ending. Pacinian corpuscles are rapidly adapting receptors that detect gross pressure changes and vibrations in the skin. Deformation in the corpuscle causes the action potentials to be generated by opening pressure-sensitive sodium ion channels. These corpuscles are especially susceptible to vibrations, which they can sense even centimeters away. It is thought that they respond to high-velocity changes in joint position. These structures were named after Filippo Pacini (1812-1883) who discovered them in 1831 during a dissection class. |
| Category | Education |
| Tags | Lamellar Corpuscle | Hand Surgery (Medical Specialty) | Anatomy (Field Of Study) | Hand (Anatomical Structure) | McClellan | Plastic Surgery | Hand Surgery | Medicine (Field Of Study) | Morgantown | West Virginia |
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