UNIT ONE - Spinal Cord ASN

What horns contain somatic and visceral sensory nuclei?

posterior (dorsal) horns

What horns contain somatic motor neurons?

anterior (ventral) horns

A spinal nerve contains

axons of motor and sensory neurons

The ventral root of a spinal nerve contains

axons of motor neurons

The dorsal root of a spinal nerve contains

axons of sensory neurons carrying afferent information

Which of the following are true regarding spinal cord tracts? a) tracts within the spinal cord can contain both descending and ascending information b) tracts are primarily located within the gray matter of the spinal cord c) ascending tracts carry sensory information toward the brain d) descending tracts carry motor commands into the spinal cord e) tracts are mixed, containing both motor and sensory axons

c,d

In gross dissection, the filum terminale and the long ventral and dorsal roots are collectively referred to as the

cauda equina

The H shaped mass in the center of the spinal cord is dominated by

cell bodies of neurons and neuroglial cells

The anterior horns are the largest in the ________ regions

cervical and lumbar

The white matter of the spinal cord is organized into anterior, posterior, and lateral....

columns

The spinal cord ends inferiorly at the

conus medularis

The cervical enlargement... a) occurs in the proximal cervical segments C1-C2 b) is the only enlargement in the spinal cord c) contains only gray matter d) supplies nerves to the upper extremity e) all of the above

d

Every spinal cord segment is associated with a pair of ____, which contain the cell bodies of sensory neurons.

dorsal root ganglia

The gray matter of the spinal cord is organized into anterior, posterior, and lateral...

horns

What horns are found only between segments T1 and L2?

lateral horns

What horns contain visceral motor neurons?

lateral horns