Chapter 16 Practice Quiz

The spinal cord extends inferiorly from the brain through the foramen magnum and ends at the level of the __________ vertebra.

L1

Intercostal nerves are the anterior rami of which spinal nerve?

T1-T11

What is a dermatome?

a specific segment of skin supplied by a single spinal nerve

The _____ nerve of the brachial plexus innervates the deltoid and trees minor muscle

axillary

Which nerve of the sacral plexuses is the largest and longest nerve in the body?

sciatic nerve

The anterior roots contain ____________ axons, while the posterior roots contain _____________ axons.

motor; sensory

The space that lies between the dura mater and the periosteum of the vertebrae, and houses areolar connective tissue, blood vessels, and adipose connective tissue is the ___________ space.

epidural

The spinal cord is partitioned into an inner __________ matter region, and an outer ___________ matter region.

gray; white

A spinal nerve splits into ____ branches

two

Which is true of the anterior horns of the spinal cord?

They house cell bodies of somatic motor neurons

Which of the following are ways in which white matter in the spinal cord conveys sensory and/or motor information between the body and the brain?

Ascending tracts conduct sensory impulses from the spinal cord to the brain, descending tracts conduct motor commands from the brain to the spinal cord, each tract conducts either sensory impulses or motor commands, but not both.