Spinal Cord Flashcards Preview

[OS 202] Lecture Exam A > Spinal Cord > Flashcards

Flashcards in Spinal Cord Deck (28):
1

Extent of Spinal Cord

Foramen Magnum -> Lower border of L1 Vertebra/Upper Border of L2

2

Length Spinal Cord

45 cm Males
43 cm Females

3

Origin of Dorsal Root Ganglion and Autonomic Ganglion

Neural Crest

4

At Birth where does spinal cord end?

L3

5

In Adults where does the spinal cord end?

Lower Border L1/Upper Border L2

6

Surgery and Spinal taps are usually at what vertebra onward?

L3

7

How many spinal nerves?
How are they distributed?

8 Cervical
12 Thoracic
5 Lumbar
5 Sacral
1 Coccygeal

31 Pairs Total

8

Cervical Nerves all exit where?
What's the exception?
How about the rest of the spinal nerves?

They usually exit ABOVE the corresponding vertebra

C8 exits BENEATH the C7 vertebrae

The rest exit below the vertebrae

9

Spinal cord is flattened where?

Dorsoventrally

10

Define: Conus Medullaris

Conical termination of spinal cord at the level of L1

11

Location: Conus Medullaris

S2-S4 Cord Segments
Located between L1 and L2 Vertebrae

12

Location: Cauda Equina

S5-L2 Segments

13

Function: Filum Terminale

Anchors end of the spinal cord by inserting at dorsum of coccyx

14

Function: Denticulate Ligaments

Shelves of pia mater that attach the spinal cord to the vertebrae laterally

15

How many neurons in a spinal cord?

1 Billion

16

Funiculi : White Matter :: Grey Matter : ?

Horn

17

[White Matter]

Ascending tracts carry?

Sensory fibers from Spine -> Brain

18

[White Matter]

Descending tracts carry?

Motor impulses from Brain -> Spine

19

Define: Thecal Sac

Membrane of Dura Mater that surrounds the spinal cord and cauda equina

20

Termination Point of Thecal Sac

S1

21

Termination Point of Filum Terminale

S1

22

[Grey Matter]
4 Major Parts

Posterior Gray Horn
Anterior Gray Horn
Lateral Gray Horn
Gray Commissures

23

What types of nuclei are found in the Posterior Gray Horn?

Somatic and Visceral Sensory Nuclei

24

What types of neurons are found in Anterior Gray Horn?
Lateral Gray Horn?

A: Somatic Motor Control
L: Visceral Motor Control

25

Spinal Cord is divided into how many Laminae?

10

26

[Spinal Cord Laminae]

Which are Dorsal?
Which are Ventral?

D: Lamina 1-6
V: Lamina 7-10

27

Function: Lamina 6

Receives proprioceptive input and sensory information
Sites of origin of ascending projections to higher centres

28

Function: Lamina 9

Contains motor neurons supplying limbs