Anatomy Of Ascending Tracts Flashcards
1) Lateral spinothalamic trad.
Function
conscious Ascending tracts (pain, Temp.) from the body and face
Fast Pain Lamina representation of the body
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Lamina I, IV VIII pyrimidal
slow pain of the body Lamina respresentation
Laming 2 substantia gelatinose of Rolandi
which short Tract connected to pain tract
Lissaure’s short tract
2nd order neuron of fast pain on the body
Laminated:
Cervical most medial
Sacral most Lateral.
Deccussate to opposite side at Level of spinal Cord.
end on VPLN of Thalamus.
2nd order neuron of slow pain on the body
After Decussation
Ascend in spinoreticular tract in brainstem make collaterals with Reticular formation
Relay on interlaminar nucleus of Thalamus
3rd order neuron of slow pain on body ( dull , Affective)
inter laminar nucleus to Ant. part of cingulate gyrus. (Limbic system)
3rd order neuron of Fast pain on body (Discrimitative)
VPLN. To post central gyrus (sensory area).
(pain_Temp) from face
1st order neuron on
Trigeminal ganglia (pseudo unipolar cells of DRG)
Periphal process (opthalamic, Maxillary
Central process
Spinal nucleus of TG
2nd order neuron of face pain
from Spinal nucleus of TG to
End in VPMN of thalamus
Decussate opposite side of spinal cord.
3rd order neuron of face pain
From VPMN to Lower part of postcentral gyrus.
2) Ventral Spino thalamic tract
Conscious crude touch and pressure sensations
Relay lamina of 1st order neuron of crude touch
nucleus propius
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2nd order neuron of crude touch
Decussate→ Ascend→ join Medial Leminiscal → End VPLN of thalamus
importance of spino reticular tract
a route for dull, aching, affective pain
End of spino tectal Tract.
Importance
Superior colliculli of midbrain
For : Spino visual reflexes Head trun toward light Source.
3) Medial leminiscal
Doral column tract
Carry
Fine touch- deep pressure.
- vibration - proprioception
position in Spinal cord
occupy dorsal white column
Lamination
cervical most Lateral
sacral most Medial
Conscious proprioception and fine touch of upper body above T6
Cuneo Cerebellartract from accessory cuneate nucleus Laterally
Nucleus for Conscious proprioception of Lower part of the body
through Gracille nucleus Medially
Level of decussation
gracillie and cuneate faciulus of Medulla
1st order neuron of DCT
DRG → Gracille+ Cuneate of Medulla.
2nd order neuron of DCT.
across to Median plan→ ascend→ VPLN of thamus
