palmaris longus muscle

Palmaris longus (PL) muscle is a superficial, weak flexor of the wrist located in the anterior compartment of the forearm. It is one of the extrinsic muscles of the hand.

Summary

• origin: medial epicondyle of the humerus
• insertion: palmar aponeurosis
• arterial supply: anterior ulnar recurrent artery 
• innervation: median nerve
• action: weak flexor of the wrist and elbow; tightens palmar aponeurosis during power grip

Variant anatomy

Palmaris longus is often absent, more commonly unilaterally absent than bilaterally. There is ethnic variation in prevalence of absence:

• in ~3% of Asians
• in ~5% of African-Americans
• in ~14 (range 12-16%) of whites (Caucasians/Hispanics)

Related pathology

Due to its long tendon and short muscle belly, palmaris longus is often used as a donor tendon and its absence is not associated with any functional deficit .

Siehe auch:

• Unterarmmuskeln
• Musculus palmaris brevis
• akzessorische Muskeln von Unterarm Hand und Handgelenk
• Musculus palmaris profundus
• Varianten des Musculus palmaris longus

und weiter:

• Handgelenksmuskulatur
• Hypertrophie Musculus palmaris longus