8/13/2023 0 Comments Hand extensor compartments![]() ![]() The thumb has two extensors in the forearm the tendons of these form the anatomical snuff box. The primary function of the extensors is to straighten out the digits. The tendons unite with the interosseous and lumbrical muscles to form the extensorhood mechanism. The extensors are located on the back of the forearm and are connected in a more complex way than the flexors to the dorsum of the fingers. The human thumb also has other muscles in the thenar group ( opponens and abductor brevis muscle), moving the thumb in opposition, making grasping possible. The thumb has one long flexor and a short flexor in the thenar muscle group. The flexors allow for the actual bending of the fingers. The deep flexor attaches to the distal phalanx, and the superficial flexor attaches to the middle phalanx. They insert by tendons to the phalanges of the fingers. The fingers have two long flexors, located on the underside of the forearm. Extrinsic Įxtensor compartments of wrist (back of hand) Palmaris brevis which is a superficial muscle and adductor pollicis are also intrinsic muscles. The intrinsic muscle groups are the thenar ( thumb) and hypothenar ( little finger) muscles the interossei muscles ( four dorsally and three volarly) originating between the metacarpal bones and the lumbrical muscles arising from the deep flexor (and which are special because they have no bony origin) to insert on the dorsal extensor hood mechanism. The muscles of the hand are innervated by the radial, median, and ulnar nerves from the brachial plexus. The intrinsic group are the smaller muscles located within the hand itself. They are called extrinsic because the muscle belly is located on the forearm. The extrinsic muscle groups are the long flexors and extensors. The muscles of the hand can be subdivided into two groups: the extrinsic and intrinsic muscle groups. The muscles of the hand are the skeletal muscles responsible for the movement of the hand and fingers.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |