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Upper Limb: The Hand - Essay Example

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This essay discusses the anatomy of the human hand which has four dorsal interossei muscles. They originate from metacarpal bones and inserted into extensor expansion of extensor digitorum tendon and proximal phalanges. Further, these muscles are not visible on cadaver 22…
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Upper Limb: The Hand
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Download file to see previous pages The emanation of the trapezium is palpable but it cannot be seen because it inserts deep into the lateral side of first metacarpal nerve. The median nerve where innervation occurs is seen on cadaver 37 but not on 22.
The abductor policies Brevis muscle acts as an abductor of the human thumb. This muscle is thin, flat and situated under the skin. Further, this muscle emanates from scaphoid bone and flexor retinaculum which is not seen on cadaver 22 but visible on cadaver 24. Additionally, this muscle is innervated by the median nerve found on the human hand. This median nerve innervation is not seen on cadaver 22 but on cadaver 24 (Yokochi and Rohen 57).
Opponents digit minim muscles are triangular in shape and are located at the base of abductor minim digit, flexor Brevis minim digit, and Palmaris Brevis. It originates from the hamate bone and carpal ligament (seen on cadaver 37 but not on 22). It is inverted by the ulnar nerve. This muscle moves the fifth metacarpal on the carpometacarpal joint.
Abductor digit minim muscle is located on the ulnar of the palm of the human hand. This muscle emanates from pisiform bone, flexor retinaculum and pisohamate ligament which is seen on cadaver 37 but not on 22. It inserts into the proximal phalanx and the palmar bone of the metacarpophalangeal joint of the fifth finger. It is innervated by deep ulnar nerve seen on cadaver 24 but not on 22. The abductor digit minim develops from primordial muscle at an early age.
Flexor digit minim Brevis muscle moves the fifth finger. It originates from the convex layer of hamate bone seen on cadaver 24 but not on 22, and palmer layer of flexor retinaculum seen on cadaver 24 but not on 22. It is inserted at the ulnar side by the first phalanx of the fifth finger. Innervation is by ulnar nerve (Lederman and Lynette 311-12).
The central compartment of the human hand has the adductor policies and lumbrical muscles. ...Download file to see next pagesRead More
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