Internal Anatomy of the Spinal Cord

Question 1

Sensory information goes into the spinal cord via:

Answer 1

Dorsal roots of spinal nerves

Question 2

Motor “commands” leave the spinal cord via:

Answer 2

Ventral roots of spinal nerves

Question 3

Starts in higher centers (cortex)

Answer 3

Upper motor neurons

Question 4

Sends “commands” to lower motor neurons

Answer 4

Upper motor neurons

Question 5

Upper motor neuron lesion

Answer 5

• Spastic paralysis
• Hyperreflexia
• Hypertonia

Question 6

Starts in the spinal cord (ventral horn cells) and brainstem (cranial nerve nuclei)

Answer 6

Lower motor neurons

Question 7

Cell bodies in the dorsal horn are what type of cells?

Answer 7

Pseudounipolar

Question 8

Cell bodies in the ventral horn are what type of cells?

Answer 8

Multipolar

Question 9

Directly “commands” muscles to contract via spinal and cranial nerves

Answer 9

Lower motor neurons

Question 10

Lower motor neuron lesion

Answer 10

• Flaccid paralysis
• Hyporeflexia
• Areflexia

Question 11

Relay center for pain and temperature

Answer 11

Pericornual cells

Question 12

Involved in “editing” pain

Answer 12

Substania gelatinosa

Question 13

Contains cell bodies of neurons in several tracts, e.g., LSTT (for pain and temp)

Answer 13

Nucleus proprius

Question 14

C8-L2,3 only, involved in proprioception of the lower body

Answer 14

Nucleus Dorsalis (Clarke’s column)

Question 15

T1-L2: Preganglionic sympathetic neuron cell bodies

S2-S4: Preganglionic parasympathetic neuron cell bodies

Answer 15

Intermediolateral cell column

Question 16

Intermediolateral cell column: T1-L2

Answer 16

Preganglionic sympathetic cell bodies

Question 17

Intermediolateral cell column: S2-S4

Answer 17

Preganglionic parasympathetic cell bodies

Question 18

Rexed’s Lamina I

Answer 18

Pericornual cells

Question 19

Rexed’s Lamina II

Answer 19

Substantia gelatinosa

Question 20

Rexed’s Lamina III-VI

Answer 20

Nucleus proprius

Question 21

Rexed’s Lamina VII

Answer 21

• Intermediate zone
• Nucleus dorsalis
• Intermediolateral column

Question 22

Rexed’s Lamina VIII

Answer 22

• Part of ventral horn
• Projections to lamina XI

Question 23

Rexed’s Lamina IX

Answer 23

Motor nuclei

Question 24

Rexed’s Lamina X

Answer 24

Ventral and dorsal gray commissures

Question 25

Structures that carry a specific type of information from lower centers (or periphery) to higher centers

Answer 25

Ascending pathways

Question 26

Deep sensibility includes which modalities?

Answer 26

• Crude touch
• Vibration sense
• Conscious proprioception
• Fine touch
• Stereognosis (3D knowledge)