ULNAR NERVE-D.FOREARM

SUMMARY

1. Enters the forearm b/w heads of FCU. 
2. Then descends b/w FCU and FDP medial to ulnar a. 
3. Supplies FCU and medial FDP (tendons which attach to ring & little fingers).
4. Gives palmar cutaneous and dorsal cutaneous branches before entering hand. 

PALMAR CUTANEOUS BRANCH
5. This lies on the retinaculum near the ulnar side of the palmaris longus tendon. Supplies skin over medial palm.

DORSAL CUTANEOUS BRANCH
6. Supplies dorsal aspect of medial 1.5 digits, including nail beds. 

Image: Whitaker, R. and Borley, N. (2016). Instant anatomy. 6th ed. Chichester (West Sussex): Wiley Blackwell, p.126.

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.