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CNS (Spinal cord (Corticospinal tract neurones cortex upper motor…
CNS
Spinal cord
Lissauer's fasciculus
Anterior white commissure
Decussation of tracts:
Axons cross from left side of body to right and vice versa
Corticospinal tract
neurones cortex upper motor nuerones
Ventral
Axial motor
Lateral
Limb movements
Pre central gyrus
Through internal capsule into brain stem
75-90% fibres deccusate at medulla (limbs)
Axial fibres don't decussate here
Decussation of pyramids at medulla
Lateral corticospinal tract
Already decussated
Synpase neurone anterior horn
Anterior corticospinal tract
deccusate through anterior white commissure
Synapsing neurone anterior horn grey matter
Anterior horn axial
Lower motor neurone
Dorsal column/Posterior column
Fine movements + propioception
Gracile
Cuneate
4 nerve endings for fine touch
Pacininan
Ruffini
Meisners
Merkel
Spinothalamic tract
Anterior
Crude touch
Lateral
Pain & temp
Spinocerebellar tracts
unconcious propioceptive information
From muscles to cerebellum
Cuneocerebellar tract
Propioceptive info from upper limbs to ipsilateral cerebellum
Anterior spinocerebellar tract
Propioceptive info from lower limbs
deccusate twice, terminate in ipsilateral cerebellum
Posterior spinocerebellar tract
lower limbs to ipsilateral cerebellum
Rostral spinocerebellar tract
Propioceptive information form upper limbs to ipsilateral cerebellum
Medial leminscus pathway
propioception, fine touch and vibration
Lower limb
GRACILE FASCIULUS
Upper limb
Dorsal root ganglion
psuedounipolar: axon runs in two directions
SYNPASE
Dorsal column
CUNEATE FASICULUS
Medulla: targets for dorsal column
Cuneate and Gracile nucleus
SYNAPSE
CROSS OVER
deccusation at medulla
internal arcuate fibres
Medial leminscus
Ventral posterolateral nucleus of thalamus
SYNAPSE
POST CENTRAL GYRUS:
PRIMARY SENSORY CORTEX
Sensory tracts
Dorsal column
medial leminscal pathway :check:
Spinothalamic :check:
Lateral
pain and temp
Anterior
crude touch
Lissauer's fasciculus
Psuedounipolar
cell bodies dorsal root ganglion
Ascends or descends Lissauer's fasciculus
Synpase grey body
Dorsal horn grey matter
cell bodies: Nucleus proprius
DECCUSATE
Anterior white commissure
Ascends via spoinothalmic fasciculus
Ascends brainstem to thalamus
Post central gyrus
primary sensory cortex
Dorsal column medial leminscus pathway
Motor tracts
Cotricospinal
pyramidal :check:
Lateral
Anterior