3.1- Spinal Cord Anatomy Review Flashcards Preview

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Flashcards in 3.1- Spinal Cord Anatomy Review Deck (32):
0

Dorsal (Posterior) Horn - ______

1. runs through _________
2. contains __________

sensory

runs thoughout SC except C1
contains large fibers that block pain (gait theory)

1

Lateral Horn - ___________

1. only ________ segments
2. contain cell bodies of _____

autonomic

only T1-L2 segments
contain cell bodies of preganglionic sympathetic neurons

2

Ventral (Anterior) Horn - ______

1. cell bodies of ______
2. present throughout SC but larger in __________

motor

cell bodies of large alpha motor neurons
present throughout the spinal cord, but larger in areas where there is a lot of motor innervation (C-spine, L-spine)

3

What are rexid numbers?

numbered areas of spinal gray matter

4

What are 4 facts about the cervical cord?

1. large with slightly flattened shape
2. large ventral horn due to lots of muscles in the UE to innervate
3. dorsal horn is also large due to sensory input from UE
4. no lateral horn

5

What are 2 facts about the thoracic cord?

1. very small ventral and dorsal horn- little sensory or motor
2. lateral horn is present

6

What is a fact about the gray matter in the lumbar cord?

large ventral and dorsal horn due to large motor and sensory (proprioception) input from LE

7

What are 2 facts about the sacral cord?

1. very small due to few fibers
2. generally size of SC is largely dependent on # of cell bodies (gray matter) entering at that level (fibers generally don't take up much space)

8

What area of the SC has large ventral horn due to lots of muscles in the UE to innervate?

cervical

9

What area of the SC has no lateral horn?

cervical

10

What area of the SC has large ventral & dorsal horn due to large motor and sensory input from LE?

lumbar

11

What area of the SC has very small ventral and dorsal horn?

thoracic

12

What area of the SC is very small due to few fibers and generally size of SC is largely dependent on # of cell bodies (gray matter) entering at that level?

sacral

13

Efferent fibers are in the _____________ Tract.

Afferent fibers are in the __________ & _______ Tract.

Lateral Corticospinal Tract

Dorsal Column System & Lateral Spinothalamic Tract

14

Lateral Corticospinal Tract-
Upper motor neurons originate in the _____ and pass down to the ______ (where they cross). They then run down the SC ____ side as the Lateral Corticospinal Tract.

motor cortex

brainstem

opposite

15

Lateral Corticospinal Tract-
Upper motor neurons originate in the motor cortex & pass down to the brainstem where they cross. They run down SC on opposite side. They synapse in _____ at level of innervations and leave the SC as the _____.

ventral horn

Lower Motor Neuron (Alpha Motor Neuron)

16

Dorsal Column System-
Neuron #1 enters through the _______ and travels up _____ side of the SC before crossing in the ______.

dorsal root ganglion

same side

brainstem

17

Lateral Spinothalamic Tract-
Neuron #1 originates in ______, enter SC through the ______, cross at _____ and ascend in SC in Lateral Spinothalamic Tract.

receptors

dorsal root ganglion

point of entry

18

Lateral Spinothalamic Tract detects ____ and ____.

Dorsal Column System detects ____, ____, and _____.

pain and temp


touch, kinesthesia, and vibration

19

Often SC injury is due to the interruption of the blood supply.

What are the 2 arteries of the SC and what do they supply?

1. Anterior Spinal Artery- anterior 2/3 of spinal cord

2. Posterior Spinal Artery- other 1/3 of SC

20

_______ - one artery formed by the branches of the 2 vertebral arteries and supplies ventral horn, lateral corticospinal tract, lateral spinothalamic tract, part of dorsal horn

anterior spinal artery

21

_______ - splits in 2 branches and supplies dorsal column, part of dorsal horn

posterior spinal artery

22

Cauda Equina-
*injury here results in ______
*injury at _____ may result in both upper and lower motor neuron findings

lower motor neuron lesion

T12 or L1

23

What is the cauda equina?

What is the filum terminale?

composed of dorsal and ventral roots (spinal nerves)

continuation of the pia past the cauda equine that thickens and attaches to the coccyx (anchors)

24

Meninges-
In the SC, the ____ is 1 layer. Past the foramen magnum the ______ layer only continues down the cord.

dura

visceral

25

Meninges-
Dura continues to S2 containing the _____, ____, and ______.

roots, CSF, and filum terminale

26

How far down the SC does the visceral layer of dura go?

S2

27

What is Lumbar cistern?

What are Dentate ligaments?

collection area of CSF (where they do punctures to collect CSF and insert meds)

extensions of the pia that attach to the dura to suspend the SC in the middle

28

______ - collection area of CSF (where they do punctures to collect CSF & insert meds)

lumbar cistern

29

______ - continuations of the pia past the cauda equine that thickens and attaches to the coccyx (anchors)

filum terminale

30

______ - extensions of the pia that attach to the dura to suspend the SC in the middle

dentate ligaments

31

______ - composed of dorsal and ventral roots (spinal nerves)

cauda equina