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Palmaris Longus

Region

Origin & Insertion

['Origin: Medial epicondyle of humerus', 'Insertion: Palmar aponeurosis and flexor retinaculum']

Synergistic Muscles

['FCR', 'FCU']

Joints

['Wrist']

Primary Actions

['Tenses palmar fascia', 'Weak wrist flexion']

Nerve & Spinal Segment

Median nerve

Brachial plexus; C7–C8

Interesting

Absent in ~14% of population. [Netter’s]

Reversal of Action

Anchor hand to flex forearm upward

Common Dysfunctions

Rare functional deficit; tendon often absent unilaterally

How to Stretch

Wrist extension with finger pull.

Trigger Points

How to Strengthen

Wrist curls and grip drills.

Concentric Action

Assist wrist flexion and tensioning palmar aponeurosis

Applications:

Often absent; recruited in adaptive grip strategies or tendon grafting

Eccentric Action

Control release of wrist flexion

Isotonic Action

Squeeze ball + wrist curl combo

Related Conditions

['Median nerve irritation', 'Flexor compartment tightness']

Isometric Action

Hold light wrist flexion

Exercise Ideas

['Grip squeeze', 'Wrist roller', 'Palm tension holds']

Related Blogs

Images

Videos

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