Spinal cord gray matter: pgs 23-25

Question 1

What are the different nuclei involved in sensory (receiving, afferent) function in the gray matter?

Answer 1

Substantia Gelatinosa
Nucleus Proprius
Nucleus Dorsalis

Question 2

What is the location of the substantia gelatinosa?

Answer 2

Entire cord in the dorsal horn

Question 3

What is the function of the nucleus of substantia gelatinosa?

Answer 3

Modulates incoming pain impulses

Question 4

What is the location of nucleus proprius?

Answer 4

Entire cord in the dorsal horn

Question 5

What is the function of the nucleus proprius?

Answer 5

Cells receive incoming sensory impulses, especially pain and temperature, touch sensations. Fibers cross and form ascending tracts including lateral spinothalamic tract

Question 6

What is the location of Nucleus dorsalis?

Answer 6

C8-L2 in the dorsal horn

Question 7

What is the function of nucelus dorsalis?

Answer 7

Cells receive sensory impulses concerning nonconscious proprioception. Fibers give rise to dorsal spinocerebellar tracts.

Question 8

The nucleus dorsalis fibers give rise to the dorsal _____________________ tract.

Answer 8

Spinocerebellar

Question 9

What nuclei are located in the ventral horn and function in motor (efferent) LMN?

Answer 9

Medial motor cell column
Lateral motor cell column
Spinal Accessory nucleus
Phrenic nucleus

Question 10

Where is the medial motor cell column located?

Answer 10

Entire cord of the ventral horn

Question 11

What is the function of the medial motor cell column?

Answer 11

LMN cell bodies whose fibers exit the spinal cord and innervate trunk muscles

Question 12

Where is the lateral motor cell column located?

Answer 12

C5-T1 and L2-S3 in the ventral ramus

Question 13

What is the function of the Lateral motor cell columns?

Answer 13

Fibers in the upper division (C5-T1) innervate the upper extremities and the lower division innervates the lower extremities (L2-S3).

Question 14

Where is the spinal accessory nucleus located in the ventral horns?

Answer 14

C1-C6

Question 15

What is the function of the spinal accessory nucleus?

Answer 15

LMN cell bodies whose fibers exit the spinal cord to form the Spinal Accessory nerve that innervates trapezius and sternocleidomastoid muscles.

Question 16

Where is the phrenic nucleus located?

Answer 16

C3, C4, and C5 of the ventral horn keep the diaphram alive.

Question 17

What is the function of the phrenic nucleus?

Answer 17

Fibers form the motor component of the phrenic nerve for innervation of respiratory diaphram, the major organ for respiration

Question 18

What is the function of the Intermediolateral cell column?

Answer 18

Preganglionic sympatheitc cell bodies, fibers exit spinal cord to synapse on ganglia, forms lateral horn in the thoracic cord region.

Question 19

What is the location of the intermediolateral cell column?

Answer 19

T1-L3 in the intermediate zone

Question 20

What is the location of the sacral parasympathetic nucleus?

Answer 20

S2-S4

Question 21

What is the function of the sacral parasympathetic nucleus?

Answer 21

Preganglionic parasympatheit cell bodies, fibers exit spinal cord to synapse on ganglia, provides innervation to descending colon, sigmoid colon and pelvic viscera.

Question 22

The spinal cord is enlarged in the ________ and ___________________ regions.

Answer 22

Cervical (C5-T1) and lumbosacral region (L1-S2)

The enlargement reflect the increased number of neurons needed to innervate the limbs.

Question 23

The nerves of the brachial plexus originate at the ____________ enlargement.

Answer 23

Cervical

Question 24

The nerves of the ____________________ plexus arise from the lumbar enlargement.

Answer 24

Lumbosacral