Exam 3: Ascending Tracts

Question 1

Cervical and lumbar enlargements are seen in _____ matter

Answer 1

grey

Question 2

White matter is most abundant

Answer 2

superiorly

Question 3

Typical lower motor neuron

Answer 3

Alpha motor neuron

Question 4

Which motor neuron goes to muscle spindles (stretch receptor)?

Answer 4

gamma motor neuron

Question 5

Propriospinal

Answer 5

communicate between two sides of SC

Question 6

Lamina of Rexed

Answer 6

layers of grey matter, I-X

Question 7

Spinal Ganglia

Answer 7

• unipolar
• centrifugal
• centripetal
• thoracic - 50,000
• cervical and lumbar - 100,000

Question 8

Spinal ganglia enters both ____ and _____ roots

Answer 8

dorsal and ventral

Question 9

Centripetal towards

Answer 9

CNS

Question 10

Centrifugal towards

Answer 10

receptor ganglia enlarged due to innervating extremities

Question 11

Conscious sensation is perceived by the

Answer 11

cerebral cortex (telencephalon)

Question 12

Conscious Sensation: Exteroceptive

Answer 12

vision, hearing, touch, pressure, heat, cold, pain - outside world

Question 13

Conscious Sensation: Proprioceptive

Answer 13

position sense, kinesthetic sense (activate/inactivate muscles; posture)

Question 14

Unconscious sensation is perceived by the

Answer 14

cerebellum (metencephalon)

Question 15

Unconscious Sensation: Proprioception

Answer 15

motor coordination

Question 16

Unconscious Sensation: Enteroception

Answer 16

visceral reflexes

Question 17

First order neuron is in

Answer 17

DRG

Question 18

Second order neuron’s cell body is

Answer 18

ipsilateral

Question 19

Second order neuron’s axon terminates in the

Answer 19

contralateral thalamus

Question 20

Third order neurons are in the thalamus and project to

Answer 20

somatosensory cortex

Question 21

Somatic sensory pathways II are

Answer 21

• somatotopic

- modulated by interneurons

Question 22

Dorsal column - medial lemniscus: function

Answer 22

• proprioception

- discriminative touch

Question 23

Dorsal column - medial lemniscus: first order

Answer 23

DRG

Question 24

Dorsal column - medial lemniscus: second order

Answer 24

N. cuneatus; N. gracilis

Question 25

Dorsal column - medial lemniscus: third order

Answer 25

VPL

Question 26

Dorsal column - medial lemniscus: tracts

Answer 26

- Fasciculus Gracilus, F. Cuneatus - Medial Lemniscus - Corona Radiata

Question 27

Dorsal column - medial lemniscus: tracts | Where do the fibers cross?

Answer 27

medulla

Question 28

Internal capsule is towards the

Answer 28

thalamus

Question 29

ALS function

Answer 29

- pain - temperature - crude touch

Question 30

ALS: Direct pathway

Answer 30

spinothalamic tract

Question 31

ALS: Indirect pathway

Answer 31

spinoreticular tract

Question 32

Spinothalamic: Lateral function

Answer 32

- noxious | - thermal

Question 33

Spinothalamic: Anterior function

Answer 33

light touch

Question 34

Spinothalamic: second order

Answer 34

I, IV, V, III

Question 35

Spinothalamic: third order

Answer 35

VPL

Question 36

Spinothalamic: tracts

Answer 36

- ALS | - spinal lemniscus

Question 37

Spinothalamic: | Where do the fibers cross?

Answer 37

anterior white commissure - lateral: 1 segment - anterior: over several segments

Question 38

Spinoreticular (Paleospinothalamic) Functions:

Answer 38

- awareness | - emotion of sensation

Question 39

Spinoreticular (Paleospinothalamic): second order

Answer 39

V, VI, VII

Question 40

Spinoreticular (Paleospinothalamic): | Where does it end?

Answer 40

reticular formation

Question 41

Spinoreticular (Paleospinothalamic) has no

Answer 41

somatotopography

Question 42

Posterior spinocerebellar

Answer 42

- unconscious proprioception (leg) - second order - Dorsal N. Clarke (VII) - gracile fasciculus - inferior cerebellar peduncle

Question 43

Cuneocerebellar

Answer 43

- unconscious proprioception (arm) - second order - accessory cuneate nucleus - cuneate fasciculus - inferior cerebellar peduncle

Question 44

Cerebellar tracts monitors

Answer 44

reflex arc

Question 45

Anterior spinocerebellar

Answer 45

- crossed | - superior cerebellar peduncle

Question 46

Rostral Spinocerebellar

Answer 46

- superior and inferior cerebellar peduncle | - uncrossed

Question 47

Spinotectal turns head towards

Answer 47

stimulus

Question 48

Spinoolivary

Answer 48

cutaneous and proprioceptive