spinal cord part 1

Question 1

what are the 31 spinal segments

Answer 1

• 1-8 cervical
• 1-12 thoracic
• 1-5 lumbar
• 1-5 sacral
• 1 coccygeal

Question 2

each segment communicates with corresponding strips that run from the spinal cord ______ across the body

Answer 2

laterally

Question 3

why is there redundancy within the neural innervation of the dermatomes / myotomes

Answer 3

so that damage to one nerve doesnt totally eliminate all the info in that area

Question 4

each pair of 31 segments of the spinal cord have

Answer 4

two pairs of spinal nerves

Question 5

cervical nerves exit ___

Answer 5

laterally

Question 6

somatic sensory and visceral sensory

Answer 6

alar

Question 7

visceral motor and somatic motor

Answer 7

basal

Question 8

how many synapses dos the visceral motor neurons have

Answer 8

2

Question 9

where does the 2nd neuron come from in the visceral motor?

Answer 9

neural crest

Question 10

the somatic motor neurons only have a _______

Answer 10

single axon

Question 11

is the neural crest involved with the somatic motor neurons?

Answer 11

no

Question 12

how many layers/lamina make up the spinal cord segments?

Answer 12

12 also called rexed’s lamina

Question 13

• limbic muscle innervation

- somatic motor

Answer 13

lateral motor area

Question 14

• trunk muscle innervation

- somatic motor

Answer 14

media motor area

Question 15

• trunk internal organs

- visceral motor

Answer 15

visceral motor area

Question 16

• receives incoming info in the forms of temp and pain
• opiates work at this site
• somatic sensory

Answer 16

substania gelatinosa

Question 17

• receives incoming temp and pain info

- somatic sensory

Answer 17

nucleus proprius

Question 18

• found only in trunk area
• sympathetic system “fight or flight”
• visceral sensory

Answer 18

visceral sensory area

Question 19

• trunk area
• responsible for proprioception (awareness of position, posture, movement)
• somatic sensory

Answer 19

clarke’s columns

Question 20

• upper chest and neck
• somatic sensory
• white matter
• responsible for proprioception along with clarke’s columns

Answer 20

external cuneate nucleus

Question 21

• white matter

- responsible for touch and pressure information

Answer 21

dorsal column nuclei

Question 22

• links sensory portion to motor portion

- coordinates the info between the two via association areas

Answer 22

central gray matter