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The palmar plate moves in three phases during joint flexion. First, it slides back toward the hand. Next, it is lifted away from the proximal phalanx by the A3 pulley. Last, a lip on the middle phalanx rolls into a recess on the plate. If the A3 pulley is not intact, the normal three phases of motion do not occur and instead the plate crumples. [7]
Palmar aspect. Palmar ligament labelled as volar ligament. The palmar ligament is thinner and more flexible in its central-proximal part. On both sides it is reinforced by the so-called check rein ligaments. The accessory collateral ligaments (ACL) originate at the proximal phalanx and are inserted distally at the base of the middle phalanx ...
Superficial palmar arch, common palmar digital arteries, deep palmar arch, dorsal digital artery: Nerve: Third and fourth deep branch of ulnar nerve, first and second median nerve: Actions: Flex metacarpophalangeal joints, extend interphalangeal joints: Identifiers; Latin: musculi lumbricales manus: TA98: A04.6.02.065: TA2: 2532: FMA: 37385 ...
The extrinsic muscle groups are the long flexors and extensors. They are called extrinsic because the muscle belly is located on the forearm. The intrinsic group are the smaller muscles located within the hand itself. The muscles of the hand are innervated by the radial, median, and ulnar nerves from the brachial plexus. [1]
The deep transverse metacarpal ligament is a narrow fibrous band. It blends with the palmar metacarpophalangeal ligaments. Its palmar surface is concave where the flexor tendons pass over it. Behind [clarification needed] it, the tendons of the interosseous muscles of the hand pass to their insertions. [citation needed]
The intrinsic muscles of the thumb can be divided into two groups; the thenar eminence and other muscles. The thenar eminence refers to the group of muscles on the palm at the base of the thumb. The three muscles composing the thenar eminence are the abductor pollicis brevis, flexor pollicis brevis and opponens pollicis. [5]
Collateral ligament of interphalangeal joints of hand; Collateral ligaments of metacarpophalangeal joints; Conoid ligament; Coracoacromial ligament; Coracoclavicular ligament; Coracohumeral ligament; Costoclavicular ligament
The palmar interosseous muscles adduct the fingers towards the middle finger. This is in contrast to the dorsal interossei, which abduct the fingers away from the middle finger. In addition (like dorsal interossei) they flex the finger at the metacarpo-phalangeal joint and extend the finger at the interphalangeal joint and thus assist the ...