Bmb: Labs 5 And 6

Front 1

Shoulders

Back 1

C4

Front 2

Thumb

Back 2

C6

Front 3

Little finger

Back 3

C8

Front 4

Anterior thigh

Back 4

L2

Front 5

Medial leg

Back 5

L4

Front 6

Lateral leg

Back 6

L5

Front 7

Little toe

Back 7

S1

Front 8

What information do the spinocerebellar tracts carry?

Back 8

Unconscious proprioception

Front 9

Describe how the spinocerebellar system works.

Back 9

1. Proprioceptors send info to the cerebellum on the ipsilateral side

2. Cerebellum integrates and processes info from proprioceptors, tactile receptors, and motor neuron pools.

3. Cerebellum sends info to muscle groups to modulate their responses on the ipsilateral side

*Allows movements to be performed smoothly and accurately

Front 10

Where do spinocerebellar receptors travel in the spine?

Back 10

Peripheral area of lateral columns

Front 11

Why is it nearly impossible to localize a lesion along the spinocerebellar tract?

Back 11

Lesions in this tract are commonly involved with other motor tracts (both of which resulting in paralysis)

-Hard to distinguish one cause from the other

Front 12

What nuclei are the first processing center of the dorsal column/medial lemniscus pathway?

Back 12

Gracile and cuneate nuclei

Front 13

Where is the substantia gelatinosa?

Back 13

Lamina II of dorsal horn

Front 14

What vascular territories house the medial lemniscus and the ALS in the medulla?

Back 14

ML- paramedian vascular zone

ALS- dorsolateral vascular zone

Front 15

What is Wallenberg syndrome?

Back 15

Ischemic occlusion of the vertebral artery or PICA, resulting in:

1. Contralateral pain and temp loss in trunk and limbs

-Lose the ALS in the rostral medulla

2. Ipsilateral pain/temp loss in face

-Lose trigeminothalamic tract

3. Horner’s syndrome (ipsilateral)

-Lose sympathetic fibers

And more...

Front 16

When do the medial lemniscus and ALS meet?

Back 16

Lateral tegmentum of rostral pons

Front 17

How does the PAG affect pain transmission?

Back 17

Sends projections to raphe nuclei (homes of serotonergic neurons)

*These ultimately inhibit the pain response

Front 18

What is Brodmann’s area 1, 2, and 3?

Back 18

Primary somatosensory cortex

Location: post-central gyrus

Function: touch

Front 19

How does the trigeminothalamic system enter the pons?

Back 19

Through the middle cerebellar peduncle

Front 20

Where do the central processes of discriminative touch in the trigeminothalamic system terminate?

Back 20

Main sensory nucleus of CN V in the pons

Front 21

Where does the spinal trigeminal nucleus extend to?

Back 21

Mid pons to rostral spinal cord

Front 22

Where is the primary cell body for proprioception in the trigeminothalamic tract?

Back 22

Mesencephalic trigeminal nucleus

Front 23

What divisions of the trigeminal nerve contain motor and sensory fibers?

Back 23

Mandibular division (V3)

Front 24

What does the trigeminal ganglion contain?

Back 24

All sensory fibers for the face and the meninges (parts innervated by CN V)

Front 25

What is the relationship of the VTTT to the medial lemniscus as they ascend the Brainstem?

Back 25

VTTT is always dorsal

Front 26

What is the C1 dermatome?

Back 26

Doesn’t exist!

No dorsal/sensory root for C1

Front 27

What afferent and efferent limbs cause the jaw jerk reflex?

Back 27

Afferent- sensory part of V3 (GSA)

Efferent- motor part of V3 (BE)

Front 28

What are the afferent and efferent limbs of the corneal reflex?

Back 28

Afferent- V1 (GSA)

Efferent- VII (BE)