0071509674.pdf

• Digital abductionis a function of the dorsal interossei (“DAB”—dorsal
  abduction); digital adduction is a function of palmar interossei (“PAD”—
  palmaradduct).


• The ulnar arteryis the principal supply to the superficial palmar arch in
  the hand.


• Lymphatic drainagefrom the palmar hand and digits is toward the dor-
  sal subcutaneous space of the hand, explaining the extreme swelling of
  this region that accompanies infections of the digits or volar surface.


• Radial sensory functionis tested in the web space of the thumb; ulnar
  sensory functionis tested along the fifth digit. The digital branchesof
  the median and ulnar nerves lie along the sides of the fingers where they
  may be anesthetized (see figure below).

44 Anatomy, Histology, and Cell Biology

Radial n.

Median n.

Ulnar n.

Superficial br

of radial n.

Isolated supply of

radial n. (C6–C7)

Volar digital br

of median n.

Isolated supply

of ulnar nerve