chapter 12

10. Spinal nerves C5-T1 make up the ____________ plexus. A. sacral B. lumbar C. brachial D. cervical E. radial

C. brachial

5. The perineurium A. surrounds nerve cell bodies. B. surrounds individual axons and their Schwann cells. C. bundles axons into fascicles. D. bundles fascicles into nerves. E. bundles fascicles into axons.

C. bundles axons into fascicles.

8. Dermatomal maps are important clinically because they A. can be used to check for motor function. B. locate the position of cranial nerves. C. can be used to help locate nerve damage. D. indicate what muscles are innervated by each spinal nerve. E. can be used to detect cranial nerve damage.

C. can be used to help locate nerve damage.

6. Which of the following combinations indicates the correct distribution of spinal nerve pairs? A. 7 cervical - 12 thoracic - 6 lumbar - 5 sacral - 1 coccygeal B. 7 cervical - 12 thoracic - 5 lumbar - 6 sacral - 1 coccygeal C. 8 cervical - 12 thoracic - 6 lumbar - 4 sacral - 1 coccygeal D. 8 cervical - 12 thoracic - 5 lumbar - 5 sacral - 1 coccygeal E. 7 cervical - 13 thoracic - 6 lumbar - 5 sacral - 1 coccygeal

D. 8 cervical - 12 thoracic - 5 lumbar - 5 sacral - 1 coccygeal

3. Which of the following is false? A. The dorsal root of the spinal cord conveys sensory (afferent) nerve impulses to the spinal cord. B. The posterior horn of the cord contains the cell bodies of motor neurons. C. The ventral root is formed by the axons of neurons in the lateral and anterior horns. D. The dorsal and ventral roots unite to form spinal nerves. E. The ventral root of the spinal cord conveys motor (efferent) nerve impulses away from the spinal cord.

B. The posterior horn of the cord contains the cell bodies of motor neurons.

7. A man was in an accident and severed his spinal cord between C6 and C7. Which of the following would NOT occur? A. loss of sensation in the trunk below the shoulders, the lower limbs and portions of the arms B. loss of use of the phrenic nerves and paralysis of the diaphragm C. loss of movement in the lower limbs D. loss of the use of the intercostals nerves, and breathing would be affected because the intercostals muscles would be paralyzed E. loss of sensation and movement in the jaw

B. loss of use of the phrenic nerves and paralysis of the diaphragm

2. What space, found between the vertebral wall and the dura mater, is the area for injecting anesthesia for childbirth? A. subarachnoid space B. subdural space C. epidural space D. epipial space

C. epidural space

1. The spinal cord A. controls the reticular activating system. B. stores reflexive memory. C. forms memory engrams. D. links the peripheral nervous system to the brain. E. is characterized by conscious activity.

D. links the peripheral nervous system to the brain.

9. Ventral rami of some spinal nerves join with each other to form a A. ganglion. B. dermatome. C. cord. D. plexus. E. nerve.

D. plexus.

4. Reflexes function in A. removing the body from painful stimuli. B. keeping the body from falling. C. maintaining blood pressure. D. maintaining blood CO2 levels. E. All of these choices are correct.

E. All of these choices are correct.