Unit 1: Spinal Cord Neuroanatomy

Question 1

L1: ________ secondary neurons cross the midline in the spinal cord.

Answer 1

Pain and Temperature sensation

Question 2

L1: Lower Motor Neuron syndrome is classified as _____ paresis.

Answer 2

Flaccid

Question 3

L1: Second-order pain/temperature sensory neurons synapse with a third-order neuron in the ______.

Answer 3

Ventral Posterolateral Nucleus of the Thalamus

Question 4

L1: Soma of primary sensory neurons reside in the ______.

Answer 4

dorsal root ganglion

Question 5

L1: The third-order sensory neuron innervates the _______.

Answer 5

Primary sensory cortex

Question 6

L1: Upper Motor Neuron syndrome is classified as ______ paresis.

Answer 6

Spastic

Question 7

L1: Vibration/Proprioception second-order sensory neurons synaps with a third-order neuron in the _______.

Answer 7

Ventral Posterolateral Nucleus of the Thalamus

Question 8

L2: ___% (the majority) of corticospinal fibers decussate in the _______.

Answer 8

80; medullary pyramid

Question 9

L2: Axons in the lateral corticospinal tract arise on the _______ side of the cortex.

Answer 9

contralateral

Question 10

L2: Axons in the lateral corticospinal tract synapse in the _______.

Answer 10

Ventral gray matter of the spinal cord

Question 11

L2: Axons of the primary sensory neuron for pain or temperature enter the spinal cord and ascend or descent in _________.

Answer 11

Lissauer’s fasciculus

Question 12

L2: Corticospinal fibers that do not decussate in the medulla cross the midline via the ________.

Answer 12

Ventral white commissure

Question 13

L2: Pain or temperature primary sensory neurons synapse at the _______. (___ matter of the _____ horn)

Answer 13

Substantia gelatinosa; gray; dorsal

Question 14

L2: Pelvic splanchnic preganglionic parasympathetic fibers are found in the _______

Answer 14

Lateral gray horn T12-L1

Question 15

L2: The fasciculus gracilis carries fibers for the _____ extremity and is located more _______.

Answer 15

Lower; medially

Question 16

L2: The internal capsule transects the ______.

Answer 16

Striatum

Question 17

L2: The second-order pain/temperature sensory neuron ascends in the ________ part of the spinal cord.

Answer 17

anteriolateral

Question 18

L2: The second-order pain/temperature sensory neuron crosses the midline via the ________.

Answer 18

Ventral white commissure

Question 19

L2: The striatum consists of the _____ and the _______.

Answer 19

Caudate nucleus, putamen

Question 20

L2: Vibration/Proprioception primary sensory neurons (lower extremity) ascend in the spinal cord in the _______.

Answer 20

Fasciculus Gracilis

Question 21

L2: Vibration/Proprioception primary sensory neurons (lower extremity) synapse with a second-order neuron in the ______.

Answer 21

Nucleus Gracilis

Question 22

L2: Vibration/Proprioception primary sensory neurons (upper extremity) ascend in the spinal cord in the _______.

Answer 22

Fasciculus Cuneatis

Question 23

L2: Vibration/Proprioception primary sensory neurons (upper extremity) synapse with a second-order neuron in the ______.

Answer 23

Nucleus Cuneatis

Question 24

L2: Vibration/Proprioception second-order sensory neurons cross the midline via the ______.

Answer 24

Medial Lemniscus

Question 25

L2: Vibration/Proprioception sensory neurons reach the brain via the ________ system

Answer 25

posterior cord/medial lemniscal