T3: SPINAL CORD

Question 1

What is the cone-shaped end of the spinal cord?

Answer 1

Conus Medullaris

Question 2

A space filled with CSF and contains the Cauda Equina

Answer 2

Subarachnoid Space

Question 3

A bundle of spinal nerves in the conus medullaris at the L2 SC segment level

Answer 3

Cauda Equina/’Horse Tail”

Question 4

The dura mater which extends to S2, is known as?

Answer 4

Dural Sheath

Question 5

What is located between the dura and inferior surface of the neural canal, where an “epidural injection” is inserted?

Answer 5

Epidural Space

Question 6

The area of the spinal cord which a pair of dorsal and ventral roots arise

Answer 6

SC Segments

Question 7

A formation of the anterior and posterior roots joining together, to form a bony channel between adjacent vertebrae, to form a spinal nerve

Answer 7

Intervertebral Foramen

Question 8

Which root carries Afferent information?

Answer 8

Dorsal/Posterior Root

Question 9

Which root carries Efferent information?

Answer 9

Ventral/Anterior Root

Question 10

The Ventral Root carries Efferent information to the…?

Answer 10

Spinal Cord to Muscles and Viscera

Question 11

The lumbar and sacral spinal nerve roots below the conus medullaris form the…?

Answer 11

Cauda Equina

Question 12

How many pairs and segments of spinal nerves are there?

Answer 12

31 pairs/segments

Question 13

What divides the spinal cord into right and left sides?

Answer 13

• Anterior Median Fissure

- Posterior Median Sulcus

Question 14

Consists of cell bodies of neurons, neuroglia, unmyelinated axons and the dendrites of interneurons and motor neurons.

Answer 14

Gray Matter

Question 15

Filled with CSF and runs longitudinally through the length of the entire spinal cord. And contiguous with the ventricular system of the brain

Answer 15

Central Canal

Question 16

Which horn contains the cell bodies of lower motor neurons (LMN)?

Answer 16

Ventral/Anterior Horn

Question 17

What is the “collective term” for the brainstem and SC?

Answer 17

Neuraxis

Question 18

What does the LMNs in the cranial nerves innervate?

Answer 18

Muscles of the head

Question 19

LMNs leave the SC to innervate..?

Answer 19

Muscles of the body

Question 20

The lateral horn is present at the ___ levels of the spinal cord, specifically through _______ vertebra

Answer 20

14 Levels

T1 - L2

Question 21

What system outflow is via the T1-L2 cell bodies in the lateral horn?

Answer 21

Sympathetic NS

Question 22

What is the Sympathetic NS referred to as?

Answer 22

Thoracolumbar Outflow

Question 23

LMN are motor neurons whose cell bodies are found in the? (2 locations)

Answer 23

• Ventral Horn

- Cranial Nerve Nuclei of the brainstem

Question 24

What innervates the LMN, and its “link”.

Answer 24

• Innervates skeletal muscle fibres for all voluntary movement
• Act as a link between UpperMN and muscles

Question 25

A LMN type that innervate extrafusal fibres - involved in muscle contraction

Answer 25

Alpha Motor Neurons

Question 26

A LMN type that innervates intrafusal muscle fibres, with 1a sensory afferents compose muscle spindles. Sensing body proprioception.

Answer 26

Gamma Motor Neurons

Question 27

Bundled axons in the CNS

Answer 27

Tracts

Question 28

Sensory tracts travel toward the brain

Answer 28

Ascending Tracts

Question 29

Motor tracts travel away from the brain

Answer 29

Descending Tracts