Chapter 16 Quiz

The anterior root of a spinal nerve contains

axons of motor neurons only

The radial nerve originates from the ______ plexus.

brachial

The tapered inferior end of the spinal cord is called the

conus medullaris

Axons cross from one side of the spinal cord to the other through a region called the

gray commissure

lower limbs are supplied by neurons from the _____ of the spinal cord

lumbosacral enlargement

The white matter of the spinal cord is composed primarily of

myelinated axons

Which structure provides motor innervation to the deep back muscles and receives sensory information from the skin of the back?

posterior ramus

The subarachnoid space contains _______, and the epidural space contains _______.

CSF; fat, connective tissue, and blood vessels

Identify the meningeal layer immediately deep to the subdural space

arachnoid mater

Which statement is true about intercostal nerves?

they originate from the thoracic part of the spinal cord