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Adductor Pollicis
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| Adductor Pollicis | |
|---|---|
| Muscle Type | |
| Origin | Oblique fibres: capitate bone and bases of MC2-3.
Transverse fibres: Palmar surface of MC3 |
| Insertion | Transverse head into ulnar side of base of proximal phalanx of thumb. Oblique head into extensor expansion. |
| Action | Adduction of CMCJ. Adduciton and assistance with flexion of MCPJ. Thumb moves towards plane of thumb. Assists in opposition of thumb towards little finger. May assist in extending IPJ (oblique fibres) |
| Synergists | |
| Antagonists | |
| Spinal innervation | C8, T1 |
| Peripheral Innervation | Ulnar Nerve |
| Vasculature | |
Manual Muscle Testing
Patient: Sitting or supine
Fixation: Stabilisation by clinician or resting on table
Test: Thumb adduction towards palm
Pressure: Against medial aspect of thumb, into abduction away from palm
