Make a diagram of the hierarchy of motor control. Position the CPGs, motor cortex, brain stem nuclei, cerebellum, and basal nuclei in this scheme.

The neural machinery of the spinal cord is at the

(a) precommand level

(b) projection level

(c) segmental level

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 hand and digits (two nerves)

 ___; ___ (7) muscles that extend the hand and digits

 ___; ___ (8) skin and extensor muscles of the posterior arm

 ___; ___ (9) fibularis muscles, tibialis anterior, and toe extensors

___; ___, ___, ___, (10) elbow joint

Key A: Plexuses

(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

List the structural components of the peripheral nervous system, and describe the function of each component.

(a) Define plexus.

(b) Indicate the ventral rami of origin of the four major nerve plexuses.

(a) Describe the formation and composition of a spinal nerve.

(b) Name the branches of a spinal nerve (other than the rami communicantes), and indicate their distribution.

Marcus, a football quarterback, suffered torn menisci in his right knee joint when tackled from the side. The same injury crushed his common fibular nerve against the head of the fibula. What locomotor problems did Marcus have after this?

As Luke fell off a ladder, he grabbed a tree branch with his right hand, but unfortunately lost his grip and fell heavily to the ground. Days later, Luke complained that his right upper limb was numb. What was damaged in his fall?

Mr. Frank, a former stroke victim who had made a remarkable recovery, suddenly began to have problems reading. He complained of seeing double and also had problems navigating steps. He was unable to move his left eye downward and laterally. Which cranial nerve was the site of lesion? (Right or left?)