Spinal cord, ascending and descending pathways Flashcards Preview

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Flashcards in Spinal cord, ascending and descending pathways Deck (22):
1

How many pairs of spinal nerves are there?

31

2

What are the 2 enlargements of the spine?

-cervical enlargement

-lumbar enlargement

3

Posterior roots are motor/sensory, whilst anterior roots are motor/sensory.

Posterior roots = sensory

Anterior roots = motor

4

The _____ ligament suspends the spinal cord

Denticulate ligament

5

The inner H of the spinal cord is the ____ matter

H = grey matter

6

What is contained within the central canal of the spinal cord?

CSF

7

What arteries suppl the spinal cord?

3 longitudinal arteries
-1 anterior
-2 posterior

segmental arteries

radicular arteries

8

Where is the epidural space found? What does it contain?

Epidural space is between dura matter and bone. Contains:
-epidural venos plexus
-adipose

9

What is the main neural tract conveying touch, vibration and prorioception up to the somatosensory cortex?

The Dorsal Column Medial Lemniscus System

10

The Dorsal colum medial lemniscus fibres cross in the _____

medulla

11

The Dorsal column medial lemniscus system second order fibres synapse in the _____

thalamus

12

What modalities are carried up to the somatosensory cortex by the Spinothalamic Tracts (anterior and lateral)?

Anterior Spinothalamic tract:
-crude touch
-pressure

Lateral Spinothalamic tract:
-Pain
-Temperature

13

The Spinothalamic tract fibres cross at the _____

spinal cord level

14

Where in the brain do the spinothalamic tract second-order fibres synapse?

Thalamus, with third-order neurons that travel to somatosensory cortex

15

Where in the cerebrum is the primary somatosensory cortex located?

postcentral gyrus

16

What's the location of the primary motor cortex in the brain?

precentral gyrus (of the cerebral cortex)

17

Name the descending (motor) spinal tract.

-Corticospinal (Pyramidal) tract

Extrapyramidal:
-Tectospinal tract
-Reticulospinal tract
-Vestibulospinal tract

18

What is the modality of the corticospinal tract?

fine, precise movement

19

Where do most of the fibres of the corticospinal tract decussate?

medulla

20

How does a Cardiovascular Accident (CVA) at the internal capsule affect the Corticospinal tract, i.e. what is the clinical picture?

spastic paralysis (decorticate posturing)

21

What reflex is mediated by the Tectospinal tract?

Head/neck movements due to visual stimul
-e.g. turning towards moving object

22

Reticulospinal tract fibres originating
-in the pons facilitate flexor/extensor movements;
-in the medulla facilitate flexor/extensor movements

pons = extensor

medulla = flexor