Spinal Grey Matter

Question 1

Consists of fine myelinated and un myelinated dorsal root fibers that enter medial portion of this zone

Answer 1

Zone of Lissauer (dorsolateral fasciculus)

Question 2

Láminas located in dorsal horn of spinal cords

Answer 2

I-IV

Question 3

Contains terminals of dorsal root fibers that mediate pain and temp sensations that synapse on posteromarginal nucleus

Answer 3

Lámina I

Question 4

Axons of this nucleus cross opposite side and ascend as lateral spinothalamic tract

Answer 4

Posteromarginal nucleus

Question 5

Contains sustancia gelatinosa

Answer 5

Lamina II

Question 6

Neurons modulate activity of pain and temp afferent fibers and activation of receptors release substance p and glutamate

Answer 6

Sustancia gelatinosa

Question 7

Contain proper sensory nucleus

Answer 7

III-IV

Question 8

Receives input from sustancia gelatinosa and contributes to spinothalamic tract mediating: pain, temp, and crude touch

Answer 8

Proper sensory nucleus

Question 9

Neurons in this lamina receive descending fibers from corticospinal and rubrospinal tracts and give rise to axons that contribute to spinothalamic tracts

Answer 9

Lamina V

Question 10

Present only in cervical and lumbar segments
Median segments: receive muscle spindle and joint afferents
Lateral segments: receive fibers from descending corticospinal and rubrospinal pathways
(Somatic motor processes)

Answer 10

Lamina VI

Question 11

Contains nucleus dorsalis of Clarke, sympathetic preganglionic neurons that make up intermediolateral cell column and renshaw cells

Answer 11

Lamina VII

Question 12

At what level is nucleus dorsalis of Clarke found

Answer 12

C8-L2

Question 13

Nucleus receives muscle and tendon afferents and axons form dorsal spinocerebellar tract which relays information to ipsilateral cerebellum

Answer 13

Nucleus dorsalis of Clarke

Question 14

Level where interomediolateral cell column is found

Answer 14

T1-L2

Question 15

Located in ventral horn of spinal cord

Answer 15

Lamina VIII-IX

Question 16

Neurons receive inputs from descending motor tracts from cerebral cortex and brain stem and contain both alpha and gamma neurons that innervate skeletal muscles

Answer 16

Lamina VIII-IX

Question 17

Neurons that Innervate extensor muscles are located

Answer 17

Ventrally

Question 18

Neurons that innervate flexor muscles are located

Answer 18

Dorsally

Question 19

Neurons that innervate axial muscles are located

Answer 19

Medially

Question 20

Neurons that innervate distal extremities are found

Answer 20

Laterally

Question 21

C3-C5, contains phrenic motor neurons that innervate diaphragm and in thoracic segments innervate intercostal, rib and back muscles

Answer 21

Lamina IX

Question 22

Grey matter surrounding central canal and site of convergence for somatic and visceral afferents

Answer 22

Lamina X