13. The Peripheral Nervous System

Introduction to the Peripheral Nervous System

Open Question
Name the four major nerve plexuses formed by the ventral rami and the body region served by each.
Multiple Choice
Which of the following structures can be found in the afferent division of the PNS?
Open Question
Match each type of neuroglial cell with its correct function.

____Schwann cells
____Ependymal cells
____Microglial cells
____Oligodendrocytes
____Satellite cells
____Astrocytes

a. Phagocytic cells of the CNS
b. Surround the cell bodies of neurons in the PNS
c. Create the myelin sheath in the PNS
d. Anchor neurons and blood vessels, maintain extracellular environment around neurons, assist in repair of damaged brain tissue
e. Create the myelin sheath in the CNS
f. Ciliated cells in the CNS that produce and circulate the fluid around the brain and spinal cord
Open Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

d. The term nerve is the equivalent of the term neuron.
Open Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

e. There are 31 pairs of spinal nerves and 12 pairs of cranial nerves.
Open Question
The anterior roots of each spinal segment (a) bring sensory information into the spinal cord, (b) control peripheral effectors, (c) contain the axons of somatic motor and visceral motor neurons, (d) do both b and c.
Open Question
Spinal nerves are called mixed nerves because they (a) contain sensory and motor fibers, (b) exit at intervertebral foramina, (c) are associated with a pair of spinal ganglia, (d) are associated with posterior and anterior roots.
Open Question
Match the names of the cranial nerves in column B to the appropriate description in column A. Column A_______(1) causes pupillary constriction_______(2) the major sensory nerve of the face_______(3) serves the sternocleido-mastoid and trapezius muscles_______(4) purely sensory (two nerves)_______(5) serves the tongue muscles_______(6) allows you to chew your food_______(7) impaired in Bell's palsy_______(8) helps regulate heart activity_______(9) helps you hear and maintain your balance_______(10) contain parasympathetic motor fibers (four nerves) Column Ba. abducensb. accessoryc. faciald. glossopharyngeale. hypoglossalf. oculomotorg. olfactoryh. optici. trigeminalj. trochleark. vagusl. vestibulocochlear
Open Question
The connective tissue sheath that surrounds a fascicle of nerve fibers is thea. epineurium,b. endoneurium,c. perineurium,d. epimysium.
Open Question
A sensory region monitored by the posterior rami of a single spinal segment is (a) a ganglion, (b) a fascicle, (c) a dermatome, (d) a ramus.
Open Question
Multiple ChoiceMore than one choice may apply.Which contains only motor fibers?a. b. c. d.
Open Question
The major nerve of the cervical plexus that innervates the diaphragm is the (a) median nerve, (b) axillary nerve, (c) phrenic nerve, (d) common fibular nerve.
Open Question
Multiple ChoiceMore than one choice may apply.Cranial nerves that have some function in vision include thea. trochlear.b. trigeminal.c. abducens.d. facial.
Open Question
The genitofemoral, femoral, and lateral femoral cutaneous nerves are major nerves of the (a) lumbar plexus, (b) sacral plexus, (c) brachial plexus, (d) cervical plexus.
Open Question
Multiple ChoiceMore than one choice may apply.Motor functions of the extensor muscles of the arm, forearm, and fingers would be affected by damage to which one of these nerves?a. Radialb. Axillaryc. Ulnard. Median