Motor And Sensory Systems Of The Brain ⛑ Flashcards
(29 cards)
What is discriminative sensation
Touch and pressure
Where do the sensory nerves terminate (e.g c8 -L arm )
The cuneate fascicules
The cuneate nucleus and Gracile nucleus =
Decussation/ crossing over
Located in the lower medulla
The medial is a
White matter tract
First, second and third order neutrons go to …
The primary sensory cortex
The pathway of discriminative sensation aka
Dorsal column / medial lemniscal system
The pathway for touch and pressure
. Cuneate/ glacial fascicules - Cuneate/ glacial nucleus - medial lemniscus medulla/pons/midbrain -internal causal
Spinothalamic tract
Pain and temperature
Sensory Input for p/t….
From free nerve ending
Pain and temperature decussation…at
The anterior white commissure in sp
A+C fibres in dorsolateral tract
= the zone of lissaure
Where do the sensations of p/t and t/p meet?
In the medial lemniscus
T/p first order end = cuneate or gracile nucleus …second order end =
Thalamus
Partway for p/t
Free nerve ending- spinothalamic fibres in sp/ medulla/pons/ midbrain- internal capsule - primary sensory cortex
Myelination
T/p= heavily P/t= none
Conduction speed
T/p=50m/s
P/t=1m/s
Function
T/p and p/t
The first neuron terminates where ? (Both t/p and p/t)
T/p=cuneate/ gracile nucleus
P/t= great matter 1 and 2
Corticospinal tract/ pyramidal tract has how many neurones and travels form …to
Only takes 2 neurones and travels from the motor cortex to the spinal cord
Legion of the upper motor neurone results in
Spastic paralysis
Legion to the lower motor neurones results in ..
Flasied paralysis
What % of neurones cross and what is the tract called
Tract = lateral corticospinal tract = 85% - pyramidal decussation (for fine movements )
What % take the anterior corticospinal tract
10 - 30 %
For big movements
What is the basal ganglia 5
. Covate nucleus . Putamen . Globus palidus . Subthalonic nudeus . Substantial nygria
