Spinocerebellar/Trigeminal

Question 1

What are the 3 spinocerebellar pathways

Answer 1

ventral spinocerebellar
Dorsal spinocerebellar
Cuneocerebellar

Question 2

How many order neurons does the spinocerebellar path have

Answer 2

1st and 2nd order neurons

bypass the thalmus

Question 3

What are the sensory receptors of the spinocerebellar pathway

Answer 3

Pancian/ruffini corpuscles (in articular capsul)- A beta fibrs

mm spindles- alpha a fibres

Question 4

What is the first order neuron of ventral spinocerebellar tract (+ origin lvls)

Answer 4

DRG below L2/3 and then synapse in lamina 7

Question 5

What is the first order neuron of the dorsal spinocerebellar tract (+ origin lvls)

Answer 5

DGR C8/t1-L2/3 andthen synapse in dorsal nucleus of clarke

Question 6

What is the first order neuron of the cunaocerbellar fibres (+ origin lvls)

Answer 6

DRG c2-8 and enter and bypass grey matter to synapse at accessory cuneatus nucleus

Question 7

Path of 2nd order neuron of ventral spinocerebellar tract

Answer 7

From lamina 7 (2nd order) cross midline thy ant white commisure and ascend as ventral spinocerebellar tract. At midbrain they cross back thru sup medullary vellum to project to IL cerebellum

Question 8

Functions of ventral spinocerebellar tract

Answer 8

unconsious prop of lower limbs

Question 9

2nd order neurons of dorsal spinocerebellar tract and path

Answer 9

dorsal nuc of clarke (2nd order). axons enter IL white column (post) and project into the IL cerebellum

Question 10

Function of dorsal spinocerebellar tract

Answer 10

Inconsious prop of trunk/axial mm

Question 11

2nd order neurons of coneocerebellar tract and patj

Answer 11

accessory cunate nucleus in medulla (2nd). axons leave and enter into Inf cerebellar peduncle to project to IL cerebellar hemisphere

Question 12

Function of cuneocerebellar tract

Answer 12

unconsous prop of upper limbs/neck

Question 13

What oocurs in brown sequard syndrome

Answer 13

spinal cord hemisection but symptoms of ataxia are masked because of damage to lat corticospinal tract

Question 14

What is hereditary spinal ataxia and what does it affect

Answer 14

early onset (10-15y old) with degeneration of ventral spinocerebellar tract and dorsal spinocerebellar tract

Question 15

What is the function of the trigeminal pathway

Answer 15

all sensations from CL face/neck

Question 16

What is the first order neuron of the trigeminal pathway

Answer 16

trigeminal ganglion

Question 17

How do general sensory signal project to the 2nd order neuron in the trigeminal path

Answer 17

pass thru trigeminal ganglion forming sensory root of trigeminal n and project to chief sensory/pontine nucleus

Question 18

How do pain signals project to the 2nd order neuron in trigeminal path

Answer 18

form spinotrigeminal tract and descend thru medulla to synapse on different parts of spinal root of trigeminal n (lower down is lower on the face)

Question 19

What does the spinal nucleus of trigeminal also get input from

Answer 19

CN7, 9, 10

Question 20

Path of proprioceptive signals of trigeminal

Answer 20

bypass trigeminal ganglion and synapse in mesenphalic nu in midbrain

Question 21

What does the mesenpahlic nuc have connection w

Answer 21

relay local signals into motor nuclei of trigeminal, facial anmbigous, hypoglossal to create unconscious awareness of these mm

Question 22

Where are the second order neurons in trigeminal pathway (3)

Answer 22

chief sensory/ponite nuc
spinal nuc
mesencephalic nuc

Question 23

Path from second order neurons to third in trigeminal path

Answer 23

axons cross midline @ medulla and form CL trigeminal lemniscus and travel up referred to as ventral trigeminal thalamic fibres

Question 24

3rd order neuron of trigeminal path

Answer 24

VPM and travel to inf 1/3 of post central gyrus

Question 25

In lat medullary syndrome what would be affected in trigeminal

Answer 25

loss of pain/thermal sense on CL side of face

Question 26

What will damage to trigeminal root ganglia cause

Answer 26

CL loss pain/thermal/touch og gace
loss of corneal reflex
paralysis off masticatory mm on left

Question 27

What would a lesion in the thalmus or post central gyrus cause

Answer 27

all sensation lost CL