Anatomy study note · Upper limb
Extensor indicis
A deep extensor that gives the index finger its independent extension.
Key points
- Back of ulna → extensor expansion of the index.
- Deep radial nerve.
- Independent extension of the index finger.
- 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 p. 309
- 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
- Extensor pollicis brevis
- Extensor pollicis longus
- Extensor retinaculum of the wrist
- Flexor carpi radialis
- Flexor carpi ulnaris
- Flexor digitorum profundus
- Flexor digitorum superficialis
- Flexor pollicis longus
- Flexor retinaculum and carpal tunnel
- Humerus
- Hypothenar muscles
- Infraspinatus
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