10). The phrenic nerves arise from the A. cervical plexuses. B. brachial plexuse

Question

10). The phrenic nerves arise from the

A. cervical plexuses.

B. brachial plexuses.

C. lumbar plexuses.

D. sacral plexuses.

11). Which of the following are adrenergic fibers?

A. parasympathetic postganglionic fibers

B. sympathetic postganglionic fibers

C. parasympathetic preganglionic fibers

D. sympathetic preganglionic fibers

12). When a neuron becomes more excitable as a result of incoming subthreshold stimulation, it is said to be

A. facilitated.

B. amplified.

C. converged.

D. diverged.

13). In the central nervous system, myelin is formed by

A. Schwann cells.

B. oligodendrocytes.

C. astrocytes.

D. microglial cells.

14). Within the meninges, cerebrospinal fluid occupies the

A. lumbar enlargement.

B. gray commissure.

C. epidural space.

D. subarachnoid space.

Explanation / Answer

10.) Phrenic nerves arise from the cervical plexus. 11.) B. sympathetic postganglionic fibers 12.) A. facilitated 13.) B. oligodendrocytes 14.) D. subarachnoid space

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