Chapter 13, Problem 7MC

For each of the following muscles or body regions, identify the plexus and the peripheral nerve(s) (or branch of one) involved. Use choices from keys A and B.

___; ___ (1) the diaphragm ___; ___ (2) muscles of the posterior leg ___; ___ (3) anterior thigh muscles ___; ___ (4) medial thigh muscles ___; ___ (5) anterior arm muscles that flex the forearm ___; ___ (6) muscles that flex the wrist and digits (two nerves) ___; ___ (7) muscles that extend the wrist an digits ___; ___ (8) skin and extensor muscles of the posterior arm ___; ___ (9) fibularis muscles, tibialis anterior, and toe extensors ___; ___, ___, ___, ___ (10) elbow joint

Key A: Pllexuses (a) brachial (b) cervical (c) lumbar (d) sacral Key B: Nerves (1) common fibular (2) femoral (3) median (4) musculocutaneous (5) obturator (6) phrenic (7) radial (8) tibial (9) ulnar