Palmaris Longus Muscle
Palmaris longus is a small muscle of the anterior compartment of forearm. It is not a very important muscle and is absent in about 14% of the population. Although it may be absent in some people, its relative functions are not lost and are performed by other anterior muscles of forearm.
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Deltoid Muscle Biceps Brachii Brachioradialis Muscle Palmaris Longus Muscle Extensor Carpi Radialis Longus Muscle Extensor RetinaculumDorsal Interossei Muscle Extensor Carpi Ulnaris Muscle Extensor Digitorum Communis Muscle Extensor Carpi Radialis Brevis Muscle Triceps Brachii Muscle Biceps Brachii Muscle Posterior Brachialis Muscle
Palmaris Longus Muscle
It is a fusiform muscle with a small belly. It has a long tendon that passes superficial to flexor retinaculum. This cord like tendon joins the palmar aponeurosis in the end.
It originates from medial epicondyle of humerus, also known as the common flexor origin. It is inserted to distal half of flexor retinaculum and the apex of the palmar aponeurosis.
Palmaris longus is supplied by the ulnar artery through small muscular branches.
The innervation of PL is provided by the median nerve (C7, C8).
It performs an important function of flexing the hand at wrist joint. It also causes tension in the palmar fascia. However, this muscle is not the only muscle to perform these actions, as other muscles can compensate for Palmaris longus in its absence.
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ORIGIN AND INSERTION
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