The Spinal Cord

The the CNS, neurons are grouped by ____. In the PNS, neurons are grouped by ____.

Function

Target

What are the primary functions of interneurons?

Reflex

Relay

The spinal cord extends from the ____ to the ____ vertebrae.

Foramen magnum

L1-L2

In what structure does the spinal cord terminate?

The conus medularis

By what structure is the spinal cord anchored to the coccyx? What is this structure made of?

The filium terminale, which is made of pia mater

What structure is found between the conus medularis and the filium terminale?

The cauda equina

How many cervical, thoracic, lumbar, sacral, and coccygeal vertebrae are there?

7

12

5

5 (fused)

1

How many cervical, thoracic, lumbar, sacral, and coccygeal spinal nerves are there?

8

12

5

5

1

Where do cervical spinal nerves exit the intervertebral foramen?

Above the vertebra of the same number, except C8 emerges above T1

Where do thoracic-coccygeal spinal nerves exit the intervertebral foramen?

Below the vertebra of the same number

Sensory nerves enter the ____ horn while motor nerves enter the ____ horn.

Dorsal

Ventral

Where are autonomic cell bodies found in the spinal cord?

Lateral horns

What vertebral levels correspond with the sympathetic nervous system.

T1-L2

What vertebral levels correspond with the parasympathetic nervous system.

S2-S4

What spinal cord levels contain more white matter?

L and S

What are the ascending tracts found in the spinal cord?

Dorsal column

Spinothalamic

Spinocerebellar