DEEP POSTERIOR COMPARTMENT OF FOREARM-EPL
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SUMMARY
1. O: posterior surface of the middle third of the ulna & interosseous membrane.
EXTENSOR POLLICIS LONGUS
TIP: EPL, EI, SUPINATOR arise from the ulna
2. I: dorsal base of terminal phalanx of the thumb.
3. NS: posterior interosseous division of the radial n.
4. A: extends the distal phalanx of the thumb at the IPJ & CMCJ.
Image: Extensor ppollicis longus muscle. Netter. (2014). Atlas of Human Anatomy, Sixth Edition. 6th ed. Elsevier.
Reference(s)
R.M.H McMinn (1998). Last’s anatomy: regional and applied. Edinburgh: Churchill Livingstone.
Gray, H., Carter, H.V. and Davidson, G. (2017). Gray’s anatomy. London: Arcturus.
