Palmaris Profundus
Forearm & Wrist
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Palmaris profundus is sometimes called musculus comitans nervi mediani because it can travel very close to the median nerve, sometimes even sharing a connective-tissue sheath with it — which is why it can occasionally be involved in carpal tunnel symptoms.
Function
Weak wrist flexion and possible tensioning of the palmar aponeurosis; clinically important because it may occupy space near the median nerve in the carpal tunnel.
Origin
Variable. Reported origins include the radius, ulna, fascia of flexor digitorum superficialis, the common flexor origin, the flexor pollicis longus region, or palmaris longus.
Insertion
Usually the deep aspect of the palmar aponeurosis; some descriptions report attachment near or deep to the flexor retinaculum.
Innervation
Variable; reported from the median nerve, anterior interosseous nerve, or ulnar nerve.