Exam 2 Study Guide 6 Flashcards Preview

7303 Neuroanatomy > Exam 2 Study Guide 6 > Flashcards

Flashcards in Exam 2 Study Guide 6 Deck (28):
1

How is the SC organized?

by region (cervical, thoracic, lumbar, sacral, cauda equina)

2

How are SC segments identified?

by same designation as their corresponding spinal nerves

1 segment = 2 vertebrae and the disc between them

3

What are SC segments named for?

vertebral level where they exit the vertebral canal

4

What structures comprise the spinal region?

all neural structures contained within the vertebrae

- spinal cord
- dorsal roots
- ventral roots
- spinal nerves (brief)
- meninges

5

What structures comprise the spinal cord?

- columns
- horns
- grey matter
- white matter
- rexed lamina
- fissure
- sulci
- blood supply

6

CSF located here

subarachnoid space

7

organization of motor axons exiting the spinal cord

ventral rootlets form a ventral root

8

dorsal root contains

sensory axons that bring info to the SC and enter it via rootlets

9

large diameter sensory fibers (function)

proprioception and touch info

10

Where are large diameter sensory fibers found?

medially

11

small diameter fibers (function)

pain and temperature

12

Where are small diameter sensory fibers found?

laterally

13

Dorsal horn processes:

sensory info

14

Lateral horn processe:

autonomic info

15

Ventral horn processes:

motor info

16

Most of the gray matter of the SC is composed of

spinal interneurons

17

Where are lateral horns found?

T1-L2 segments

18

What is a spinal nerve?

joining of a dorsal and ventral root in the IV foramen

carry all sensory and motor of a single spinal segment

19

What are Rexed's laminae?

functionally and structurally distinct areas of spinal cord gray matter

20

tract: Contralateral fractionation of movement, particularly of hand movements

lateral CST

21

tract: Control of neck, shoulder and trunk muscles

medial CST

22

tract: Facilitates contralateral upper limb extensors

rubrospinal

23

tract: Facilitates postural muscles and gross limb movements

reticulospinal

24

tract: Adjusts activity in neck and upper back muscles

medial vestibulospinal

25

tract: Ipsilaterally facilitates LMN’s to extensors, inhibits LMN’s to flexors

lateral vestibulospinal

26

tract: Enhances the activity of interneurons and LMN’s in SC

ceruleospinal/raphespinal

27

recurrent inhibition causes inhibition of these groups

- agonists
- synergists

28

Loss of Renshaw cells creates

loss of fine motor skills