Anatomy study note · Upper limb
Palmaris longus
A small superficial flexor with a long slender tendon that runs in front of the flexor retinaculum into the palmar aponeurosis. It is absent in about 10% of people.
Key points
- Medial epicondyle → flexor retinaculum + palmar aponeurosis.
- Median nerve.
- Absent in ~10%.
- Runs superficial to the flexor retinaculum.
- Limb muscles: in situ from limb-bud mesenchyme.
- Upper limb bud C4–T2; lower limb bud L2–S2.
- Skeletal muscle: multinucleated, peripheral nuclei, striated.
- Epimysium → perimysium → endomysium.
The full note in the atlas also covers
Origin · Insertion · Action · Nerve supply · Histology · Development
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Written from
- Snell’s Clinical Anatomy by Regions, 10th ed., ch. 3, PDF pp. 284–286, 308
- Inderbir Singh’s Human Embryology, ch. 7, PDF p. 109; ch. 10, PDF pp. 142–145
- BRS Cell Biology & Histology, 7th ed., ch. 8, PDF pp. 135–144
More from the upper limb
- Pectoral nerves
- Pectoralis major
- Pectoralis minor
- Phalanges of the hand
- Pronator quadratus
- Pronator teres
- Radial artery
- Radial nerve
- Radioulnar joints and interosseous membrane
- Radius
- Rhomboid major
- Rhomboid minor
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