TRACTS Flashcards
which tract is for PROPRIOCEPTION and FINE TOUCH & VIBRATION, 2 POINT TOUCH, STRETCH
DORSAL (POSTERIOR) COLUMN MEDIAL LEMNISCUS
where do DORSAL COLUMN MEDIAL LEMNISCUS pathway fibres DECUSSATE
in the MEDULLA
DORSAL COLUMN MEDIAL LEMNISCUS
pathway going from Receptors in the skin to where (through what)
through Ventral Posterolateral Nucleus of Thalamus (synapses)
to PRIMARY SOMATOSENSORY CORTEX in POST-CENTRAL GYRUS
DORSAL COLUMN MEDIAL LEMNISCUS
- travels via FASCICULS CUTANEOUS and synapses at Nucleus Cutaneous at which level
- travels via FASCICULUS GRACILIS and synapses at Nucleus Gracilis at which level
FC - ABOVE T6
FG - BELOW T6
which pathway has 2 DECUSSATIONS therefore making innervation IPSILATERAL
SPINOCEREBELLAR Tract
DORSAL COLUMN MEDIAL LEMNISCUS
1ST ORDER NEURONES collect where before entering spinalcord at FC or FG
in DRG
DORSAL COLUMN MEDIAL LEMNISCUS
join onto 2ND ORDER NEURONES where
MEDULLA
-> DECUSSATE
DORSAL COLUMN MEDIAL LEMNISCUS
3RD ORDER NEURONES where
INTERNAL CAPSULE in POST-CENTRAL GYRUS
fast pain and temperature / noxious mechanical stimuli via which fibre
A - DELTA
cutaneous receptors for non-noxious mechanical stimuli via which fibre
A - BETA
slow pain and temperature / noxious heat and chemical stimuli via which fibre
C
which tract is for PAIN & TEMPERATURE
LATERAL SPINOTHALAMIC Tract
which tract is for CRUDE TOUCH (cannot localise site) and PRESSURE
ANTERIOR / VENTRAL SPINOTHALAMIC Tract
SPINOTHALAMIC PATHWAY comes from which skin RECEPTORS
MERKEL DISCS
FREE NERVE ENDINGS
SPINOTHALAMIC PATHWAY uses which FIBRES
A - DELTA (fast pain)
C (slow pain)
SPINOTHALAMIC PATHWAY goes from skin receptors through the … (synapses) to where
through Ventral Posterolateral nucleus of Thalamus
to PRIMARY SOMATOSENSORY CORTEX in POST-CENTRAL GYRUS
SPINOTHALAMIC Pathway DECCUSATES where
in the ANTERIOR WHITE COMMISSURE at the level of the Spinal Cord where it enters
SPINOTHALAMIC pathway
1st Order Neurones:
in DRG
SPINOTHALAMIC pathway
2ND ORDER NEURONES:
ANTERIOR WHITE COMMISSURE at the same level of the spinal cord where it enters
- after decussating
SPINOTHALAMIC pathway
3RD ORDER NEURONES where:
in THALAMUS - VENTRAL POSTEROLATERAL NUCLEUS
CORTICOSPINAL Tract
starts where and ends where
from PRIMARY MOTOR CORTEX in PRE-CENTRAL GYRUS
to
SPINAL CORD
(-> muscle)
CORTICOSPINAL Tract made up of which cells
PYRAMIDAL CELLS - LAYER V (Int. Pyramidal)
CORTICOSPINAL Tract
DECUSSATES where
90% Decussates in MEDULLA
(Pyramids - anterior)
10% remains IPSILATERAL but will decussate at spinal cord
CORTICOSPINAL Tract
90% that DECUSSATES at MEDULLA forms which pathway and what does it innervate
LATERAL CORTICOSPINAL tract
-> innervates DISTAL MUSCLES
ie hands,feet
CORTICOSPINAL Tract
10% that remains IPSILATERAL will form which pathway and what does it innervate
ANTERIOR CORTICOSPINAL Tract
-> innervates PROXIMAL MUSCLES
ie in trunk
pathway of CORTICOSPINAL Tract from motor cortex to medulla
- INTERNAL CAPSULE
- Midbrain : SUPERIOR PEDUNCLE
- Medulla : anterior PYRAMIDS (decussates)
which pathway is UNCONSCIOUS
SPINOCEREBELLAR TRACT
SPINOCEREBELLAR Tract is for..
PROPRIOCEPTION,
TOUCH,
PRESSURE,
COORDINATION,
Posture
which Skin RECEPTORS are used in SPINOCEREBELLAR Tract
- MEISSNER’S CORPUSCLE
- PASCINIAN CORPUSCLE
- RUFFINI CORPUSLE
SPINOCEREBELLAR Tract
where are the 2 DECUSSATIONS
1st: SPINAL CORD - VENTRAL WHITE
2nd: CEREBELLUM
Ventral tract (below L2) : SUPERIOR PEDUNCLE
Dorsal (C8-L2) or cuneocerebellar (above C8) :
Inferior Peduncle
SPINOCEREBELLAR Tract
where are the 1ST ORDER NEURONS
DRG
SPINOCEREBELLAR Tract
where are the 2ND ORDER NEURONS
SPINAL CORD - Lateral White (after decussating)
which Tract comes from MERKELS DISCS and FREE NERVE ENDINGS
SPINOTHALAMIC
- Pain, Temperature, Pressure, Crude Touch
DORSAL COLUMN MEDIAL LEMNISCUS is for what
Sensory Ascending Conscious
PROPRIOCEPTION, FINE TOUCH, VIBRATION
SPINOTHALAMIC is for what
Sensory Ascending Conscious
PAIN, TEMP, CRUDE TOUCH, PRESSURE
SPINOCEREBELLAR is for what
Sensory Ascending Unconcious
PROPRIOCEPTION,
TOUCH,
PRESSURE,
COORDINATION,
POSTURE
CORTICOSPINAL is for what
Motor Descending Conscious
VOLUNTARY MOVEMENT
which tract(s) DECUSSATES at MEDULLA
- DORSAL COLUMN MEDIAL LEMNISCUS
- LATERAL CORTICOSPINAL (90%)
which tract(s) DECUSSATES in SPINAL CORD
- SPINOTHALAMIC
- SPINOCEREBELLAR 1ST Decussation
- CORTICOSPINAL - last 10%
which tract innervation is IPSILATERAL
SPINOCEREBELLAR
(2 decussations)
which tract is for PAIN
LATERAL SPINOTHALAMIC
which tract uses FASCICULUS CUNEATUS and GRACILIS
DORSAL COLUMN MEDIAL LEMNISCUS
