Cord and Roots

Question 1

clark’s nucleus

Answer 1

in intermediate zone

help spinal cord respond to lower limb proprio

Question 2

large fast axon (fiber types)

Answer 2

Muscle spindles (Ia)
Golgi tendon (Ib)
touch, vibe, pressure (II, A-beta)

Question 3

small slow axon (fiber types)

Answer 3

pain/temp (A-delta, C fibers)

Question 4

small slow axon (fiber types)

Answer 4

pain/temp (A-delta, C fibers)

muscle = III, IV

Question 5

Ia, Ib paths

Answer 5

DRG
some to dorsal column
some to ventral horn (reflexes)

Question 6

II, A-beta paths

Answer 6

DRG
some to dorsal column
some to dorsal horn (suppress pain)

Question 7

A-delta, C fiber paths

Answer 7

DRG

to dorsal horn

Question 8

dorsal horn layout

Answer 8

flexors superior
extensors inferior
distal is lateral
proximal is medial

Question 9

types of motor neurons

Answer 9

alpha (contract skeletal muscles)

gamma (make muscle spindles more sensitive to stretch)

Question 10

types of motor neurons

Answer 10

alpha (contract skeletal muscles)

gamma (make muscle spindles more sensitive to stretch)

Question 11

renshaw cells

Answer 11

inhibit alpha motor neurons
affected by tetanus (take up anteretrograde)
cause spasms/lockjaw