Ch. 14.3- Section anatomy of the spinal cord and spinal roots

Question 1

Which median sulcus is narrower? Anterior or posterior?

Answer 1

Posterior

Question 2

What region is most superficial? The white or gray matter?

Answer 2

White matter

Question 3

Gray commisure

Answer 3

The bar of gray matter the connects the two sides of the gray matter of the spinal cord.

Question 4

What are the three horns of the gray matter?

Answer 4

Posterior, lateral, and anterior horns.

Question 5

What are the posterior horns made of?

Answer 5

Interneurons (neurons that are completely within the CNS.

Question 6

Where do sensory neurons extend from in the spinal cord?

Answer 6

They extend through the posterior root and synapse with the dendrites and cells bodies within the posterior horn.

Question 7

What are the subdivision of the posterior horn?

Answer 7

Somatic sensory nuclei and visceral sensory nuclei.

Question 8

Somatic sensory nuclei

Answer 8

Site for synapses between the somatic sensory neurons that extend fro the somatic sensory receptors and the interneurons within the posterior horns of the spinal cord.

Question 9

What examples of somatic sensory receptors?

Answer 9

Tactile and proprioreceptors.

Question 10

Visceral sensory nuclei

Answer 10

Locations for the synapses of visceral sensory neurons and that extend from the visceral sensory receptors to the interneurons within the posterior horns of the spinal cord.
These are things like baroreceptors and chemoreceptors.

Question 11

Anterior horns

Answer 11

Gray matter that is made of the dendrites and cells bodies of somatic motor neurons. These collectively for the somatic motor nuclei. The axons of these extend to somatic effectors.

Question 12

What are somatic effectors?

Answer 12

The muscles that can be controlled consciously and voluntarily.

Question 13

Poliomyelitis

Answer 13

Caused by one of three strains of polio virus.

Specific type of virus that attacks somatic sensory neurons in the anterior horns of the spinal cord.

Question 14

Lateral horns

Answer 14

Located only within T1-L2.
Due to the presence of dendrites and cell bodies of autonomic motor neurons. Together they form the autonomic motor nuclei.
These inert autonomic (visceral) effectors.

Question 15

Autonomic (visceral) effectors

Answer 15

Body structures that are not consciously controlled or voluntary.
(cardiac muscle, smooth muscle, and glands)

Question 16

Gray commisure

Answer 16

Houses un-myelinated axons.

Serves as. the communication rough between the right and left sides of the spinal cord.

Question 17

What is the structural name for a distinct portions of the white matter of the spinal cord?

Answer 17

Funiculus

Question 18

Posterior funiculus

Answer 18

Lies between the posterior gray horns on the posterior side of the cord and the posterior median sulcus.

Question 19

Lateral funiculus

Answer 19

White matter on each lateral side of the spinal cord.

Question 20

What are the branches of the posterior funiculus?

Answer 20

Fasciculus Gracilis- Medial

Fasciculus Cuneatus- Lateral

Question 21

Anterior Funiculus

Answer 21

White matter that is on the anterior side of the cord between the anterior horns and the anterior median fissure.

Question 22

White commisure

Answer 22

White connection between anterior funicular.