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In human anatomy, the dorsal interossei (DI) are four muscles in the back of the hand that act to abduct (spread) the index, middle, and ring fingers away from the hand's midline (ray of middle finger) and assist in flexion at the metacarpophalangeal joints and extension at the interphalangeal joints of the index, middle and ring fingers. [1]
The interosseous muscles of the hand are muscles found near the metacarpal bones that help to control the fingers. They are considered voluntary muscles. They are generally divided into two sets: 4 Dorsal interossei - Abduct the digits away from the 3rd digit (away from axial line) and are bipennate. 3 Palmar interossei - Adduct the digits ...
The muscles of the hand are the skeletal muscles responsible for the movement of the hand and fingers. The muscles of the hand can be subdivided into two groups: the extrinsic and intrinsic muscle groups. The extrinsic muscle groups are the long flexors and extensors. They are called extrinsic because the muscle belly is located on the forearm.
Extensor expansion. An extensor expansion (extensor hood, [1] dorsal expansion, dorsal hood, dorsal aponeurosis[citation needed]) is the special connective attachments by which the extensor tendons insert into the phalanges. These flattened tendons (aponeurosis) of extensor muscles span the proximal and middle phalanges. [2]
Except for abducting the hand, it flexes the hand towards the palm and abducts it radially. It is innervated by the deep branch of the radial nerve (C7-C8). [4] The extensor pollicis longus originates on the dorsal side of the ulna and the interosseous membrane. Passing through the third tendon compartment, it is inserted onto the base of the ...
Diagram of segmental distribution of the cutaneous nerves of the right upper extremity. (Dorsal digital nerves of radial nerve at bottom right, in yellow.) Dorsal digital nerves of radial nerve are branches on the dorsum of the hand. They run with the dorsal digital arteries .
Princeps pollicis artery. Palm of left hand, showing position of skin creases and bones, and surface markings for the volar arches. The princeps pollicis artery, or principal artery of the thumb, arises from the radial artery just as it turns medially towards the deep part of the hand; it descends between the first dorsal interosseous muscle ...
Dorsal interossei (Latin: interossei dorsales) may refer to: Dorsal interossei of the hand, musculi interossei dorsales manus. Dorsal interossei of the foot, musculi interossei dorsales pedis. Category: Disambiguation pages.