Spinal Cord - grey and white matter (tracts) Flashcards
What is ventral and what is dorsal?
A dorsal
B ventral
A dorsal root/horn
B ventral root/horn
What is white matter made up of?
Tracts
What are tracts?
Tracts are pathways
Axons transmitting information between higher centres in the brain and peripheral nerves
Are ascending pathways sensory or motor?
Sensory
A dorsal
B ventral
What is the majority of control of the body by the brain?
Contralateral
What is decussation?
Crossing
What is the role of the corona radiata?
Bundle of projection fibres connecting the cortices of the brain with the brainstem via the internal capsule
What do the first order neurones connect to?
Information to the spinal cord
What happens when the first order neurones reaches the spinal cord?
it crosses to the contralateral side
Where does the 2nd order neurone take information to?
Thalamus
What does the 3rd order neurone do?
Take info from thalamus to cerebral cortex
Through internal capsule to corona radiata
Does the ascending tracts always cross over at spinal cord?
No, can be higher up
where do the majority of descending texts cross over?
Medulla in pyramids
What do you call brain peripheral nerves?
Corticobulbar
What do you call spinal peripheral nerves?
Corticospinal
What do you call this tract
What does this tract sense?
Pain and temp
Name these dorsal columns
What do the dorsal columns detect?
Fine touch
vibration
Conscious muscle
Joint sense
Name these tracts
Anterior and posterior spinocerebellar
What do these tracts detect?
Muscle and joint sense to cerebellum
What are lemniscus?
A term used for some ascending (sensory) nerve tracts in the upper part of the medulla, pons, midbrain
A facial
B abducent
What neurone does the reflex arc use?
Inter neurone
How many neurones do ascending tracts have in their pathway?
3
How many neurones do descending neurones have in their pathway?
2
What motor neuron is involved in reflexes?
Lower
What has regulating effects on LMN reflexes?
UMN
Can you have reflexes if the UMN is damaged?
YES
they are exaggerated
Tone is also increased = spasticity
