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The dorsal surface of the body is divided by an oblique ridge, which extends from near the ulnar side of the base to the radial side of the head. The lateral part of this surface serves for the attachment of the fourth interosseus dorsalis; the medial part is smooth, triangular, and covered by the extensor tendons of the little finger.
The extrinsic extensor muscles of the hand are located in the back of the forearm and have long tendons connecting them to bones in the hand, where they exert their action. Extrinsic denotes their location outside the hand. Extensor denotes their action which is to extend, or open flat, joints in the hand.
The distal (tip) finger bones are divided into tuft (the very tip of the bone, at the end of each finger), shaft (the thinner middle section), and base. The rest of the finger bones (the middle finger bones, and the proximal or innermost finger bones) are divided into base, shaft, and condyle (outer end). Extensive tendons surround the joints ...
In human anatomy, the metacarpal bones or metacarpus, also known as the "palm bones", are the appendicular bones that form the intermediate part of the hand between the phalanges and the carpal bones (wrist bones), which articulate with the forearm. The metacarpal bones are homologous to the metatarsal bones in the foot.
fingers: Flexor digitorum superficialis and profundus, lumbricals, and interossei, assisted in the case of the little finger by the flexor digiti minimi brevis: extensor digitorum communis, extensor indicis proprius, and extensor digiti minimi muscle: thumb: flexor pollicis longus and brevis: extensor pollicis longus and brevis
Extensor indicis tendon. Extension of the medial four digits Fourth compartment syndrome: 5 Extensor digiti minimi tendon: Positioned directly over the distal radioulnar joint. Extensor digiti minimi usually has double tendon [2] in the fifth compartment upon inserting onto the little finger Vaughn-Jackson syndrome: 6 Extensor carpi ulnaris tendon
Passing through the first tendon compartment, it inserts to the base of the first metacarpal bone. A part of the tendon reaches the trapezium, while another fuses with the tendons of the extensor pollicis brevis and the abductor pollicis brevis. Except for abducting the hand, it flexes the hand towards the palm and abducts it radially.
The primary function of the extensors is to straighten out the digits. The thumb has two extensors in the forearm; the tendons of these form the anatomical snuff box. Also, the index finger and the little finger have an extra extensor, used, for instance, for pointing. The extensors are situated within 6 separate compartments.