interossei muscles innervation

Interosseux dorsaux ou interossei dorsales. [5], All interossei pass dorsal to the transverse metacarpal ligament but slightly volar to the flexion-extension axes of rotation of the MP joints. [4][5][6], The palmar interossei are supplied by the palmar metacarpal artery of the deep palmar arch. [3], When the MP joints are flexed, the transverse metacarpal ligament enhances the function of the distal interossei by acting as a pulley and preventing them from becoming slack, further increasing the effectiveness of IP extension. These are located anteriorly on the hand. In the hand there are four dorsal Interossei which lie superficially, inbetween the metacarpals on the dorsum of the hand. For each anatomic structure the different terms used in the literature are recalled. The exact typographic relation … The first dorsal interosseous, the most consistent, is inserted entirely into the base of its proximal phalanx and the extensor hood there. All palmar interossei originate along the shaft of the metacarpal bone of the digit on which they act. The first dorsal interosseous is also able to rotate the index finger slightly at the metacarpophalangeal joint and assist adductor pollicis in thumb adduction. all except the two outermost muscles, the first interosseus and abductor digiti minimi) because they are attached directly to the extension mechanism. The dorsal interossei of the hand are four muscles which are located between each of the metacarpals. [7], Abductor digiti minimi, the "fifth dorsal interosseus", This article incorporates text in the public domain from page 464 of the 20th edition of Gray's Anatomy (1918), Interossei dorsales of left hand, superior view, First dorsal interosseous compartment syndrome, Origin, insertion and nerve supply of the muscle,, Wikipedia articles incorporating text from the 20th edition of Gray's Anatomy (1918), Articles to be expanded from December 2013, Creative Commons Attribution-ShareAlike License, on the radial side of the base of the second proximal phalanx (index finger) and the, on the radial side of the third proximal phalanx (the middle finger) and the, on the ulnar side of the third proximal phalanx (the middle finger) and the, on the ulnar side of the fourth proximal phalanx (the ring finger) and the, This page was last edited on 5 December 2019, at 11:20. The dorsal interosseous muscles are bipennate, with each muscle arising by two heads from the adjacent sides of the metacarpal bones, but more extensively from the metacarpal bone of the finger into which the muscle is inserted. The plantar interossei muscles originate from medial side of the third, fourth and fifth metatarsal bones. Nerf ulnaire C8 Th1. The plantar interossei insert at the proximal phalanges of the third, fourth and fifth digits of the foot. Insertion. 0. The palmar interossei, in contrast, have only distal insertions. Between the heads of dorsal interossei two, three, and four, a perforating branch from the deep palmar arch is transmitted. le 2ième : sur les faces adjacentes des 2ième et 3ième métacarpiens. The interossei can, thus, be divided into a proximal and a distal group: the proximal interossei are mainly affecting the metacarpophalangeal (MP) joints, whereas the distal interossei are mainly affecting the interphalangeal (IP) joints (but, with continued action, will also affect the MP joints. [4], The dorsal interossei abduct the index, middle, and ring fingers. Insertions proximales: ils s'insèrent sur les faces latérales des métatarsiens de l'espace interosseux correspondant. )[3], All interosseous muscles of the hand, with the exception of the first and second lumbricals (the most radial two are innervated by the median nerve), are innervated by the deep branch of the ulnar nerve. [3], Compartment syndrome rarely occurs in the first dorsal interosseous compartment of hand. It can be treated by simple fasciotomy. This is in contrast to the dorsal interossei, which abduct the fingers away from the middle finger. Derek Moore 0 % Topic. [1] They are smaller than the dorsal interossei of the hand. [8], The pollical palmar interosseous muscle (PPIM) is absent in non-human primates, and is probably an autapomorphic muscle unique to the human thumb (together with flexor pollicis longus) which probably evolved from the oblique portion of adductor pollicis. Innervation. Origin and insertion. [3], When the MP joints are being flexed, the position of the interossei moves away volarly from the flexion-extension axes of the MP joints until they are nearly perpendicular to the proximal phalanx. Il faut rappeler que l'axe du pied passe par le deuxième rayon ou orteil. In effect, their ability to flex at the MP joints will depend on the position of the MP joints:[3], When the MP joints are extended, all interossei pass through the flexion-extension axes of the MP joints and their contribution there is therefore negligible, though they still play important roles as joint stabilizers (i.e. preventing MP hyperextension). [4], The palmar interosseous muscles adduct the fingers towards the middle finger. 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 hand's midline (ray of middle finger) and assist in flexion at the metacarpophalangeal joints and extension … Palmar interossei are unipennate muscles of the palmar surface of the hand. The dorsal interossei 1-2 pull the digits 2-3 laterally (radial abduction), The dorsal interossei 3-4 move the digits 3-4 medially (ulnar abduction). At the same time, the increasingly taut collateral ligaments of the MP joints cancel out the abduction-adduction component to increase the force of flexion (resulting in a strong grip). All three intrinsic groups of muscles pass palmar to the axis of the metacarpophalangeal joints, and therefore contribute to flexion there. Extension at the interphalangeal joints cannot be produced by the extensor digitorum alone, but active contraction of one of the three aforementioned intrinsic groups will because of their direct contribution to the extensor mechanism.

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