MUSCLES-LUMBRICALS

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SUMMARY


1. From each of the 4 FDP tendons arises a lumbrical which passes along the radial side of the MCPJ. 

2. On the palmar surface of the deep transverse metacarpal ligament, each develops a tendon which runs in a fibrous lumbrical canal to reach the extensor expansion on the dorsum of the 1st phalanx. 

3. 2 ulnar lumbricals are innervated by ulnar n. & 2 radial lumbricals are innervated by median n.
 
4. These flex the MCPJ.
Paste-9500cca6e7aadff060fd7c71402a040d98526ae0.jpg
Image: Case courtesy of OpenStax College, Radiopaedia.org. From the case rID: 44017 [Accessed 27 Apr 2020].

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.