Lecture 19: Structure and layout of the spinal cord

Question 1

What is grey matter?

CNS

Answer 1

cell bodies & unmyelinated axon

Question 2

What is white matter?

CNS

Answer 2

myelinated axon

Question 3

Where are cell bodies of sensory neurons located?

Answer 3

• dorsal root ganglion

Question 4

What part of the spinal cord does somatic efferent information leave from?

Answer 4

ventral horns via ventral roots

Question 5

What part of the spinal cord does autonomic efferent information leave from?

Answer 5

lateral horns via ventral roots

Question 6

What part of the spinal cord does sensory afferent information enter through?

Answer 6

• dorsal horns via dorsal roots

Question 7

Spinal nerves are mixed nerves meaning they contain both:

Answer 7

• sensory and motor neurons

Question 8

What do spinal nerves branch off and form?

Answer 8

-ventral & dorsal ramus

Question 9

In PNS what surrounds axon?

Answer 9

endoneurium

Question 10

Axons in PNS are bundled together to form fascicles which are surrounded by :

Answer 10

perineurium

Question 11

What surrounds the outside of a nerve?

Answer 11

epineurium

Question 12

Where are cell bodies of motor neurons located?

Answer 12

ventral root ganglion

Question 13

Where does the spinal cord begin?

Answer 13

• foramen magnum

Question 14

Where does the spinal cord end?

Answer 14

• L1/L2 lumbar level

Question 15

What is the filum terminale?

Answer 15

• extends from conus medularis to the end of the spinal cavity
• it anchors the spinal cord

Question 16

What is the conus medularis?

Answer 16

• end of the spinal cord is a tapered cone