Anterolateral System

Question 1

First order neuron in crude touch pathway ends on ……, while 2nd ends on …..

Answer 1

Lamina 4 & 7 = nucleus proprius
VPLN of thalamus

Question 2

Axons of anterolateral system decussate through ….

Answer 2

Ventral white commissure of spinal cord

Question 3

Pathway for crude touch 2nd order axons run in brainstem through …..

Answer 3

Medial leminiscus

Question 4

Injury of spinal cord can hardly cause any loss of ……..sensation

Answer 4

Crude touch

Question 5

Spinoreticular tract ends on …….

Answer 5

Neurons of ponto-medullary reticular formation

Question 6

The spino-reticulo-thalamo-cortical pathway is a route for ……

Answer 6

Slow, dull, aching, affective component of pain

Question 7

Describe the spinotecteal tract

Answer 7

Second order neurons arising from spinothalamic tract decussate and end in the superior colliculi of midbrain.
Responsible for spino-visual reflexes

Question 8

Firstcorder neuron of pain from face wnds on ….., while 2nd ends on ….

Answer 8

Spinal nucleus of trigenimal in pons
Ventral posteromedial n. of thalamus

Question 9

Compare the 3rd order neuron in case of fast & slow pain

Answer 9

F, discriminative comp, axons from VPLN pass in posterior limb of internal capsule then to corona radiata then to sensory area in postcentrak gyrus
S, affective comp, axons from intralaminar nucleus asecnd to ant oart of cingulate cortex (part of limbic system)

Question 10

Compare neo & paleo spino thalamic tracts

Answer 10

N, responsibile for fast discriminative component of pain, fibers are laminated with cervical most medial & sacral most lateral, the ascend in brain stem as spinal leminiscus & end on VPLN of thalamus.
P, affective-motivational aslect of pain, axons from Lam2 cross & ascend as spinoreticular tract making collaterals with reticular formation in brain stem theyvrelay in the intralaminar nucleus if thalamus

Question 11

Fast pain ends on ….., while slow pain ends on ….. in spinal cord

Answer 11

Lamina 1
Lamina 2 (Substantia Gelatonisa of Rolandi)

Question 12

Mention site in which Fibers of 1st o.n. Run in spinal cord of pain & temp

Answer 12

Dorsolateral (Lissauer’s) tract

Question 13

Types of fibers of 1st order neuron in pain pathway

Answer 13

A delta for fast pain
C for slow pain

Question 14

Describe pathway of third order neuron in sensory pathway

Answer 14

A cell in ventral posterolateral nucleus of thalamus, its axon passes through post limb of internal capsule then to corona radiata to reach sensory area of cerebral cortex

Question 15

The neuron which decussates is the …order

Answer 15

2nd

Question 16

First order neuron cell body is found in …..

Answer 16

Dorsal root ganglion

Question 17

Mention stimuli of exteroceptive & proprioceptive pathways

Answer 17

E, crude tough, pain, temperature
P, conscious & unconscious proprioception & fine touch