Page 1 of 1: physiology-decerebrate rigidity

kannan · Credits: 6918 My Scrapbook

not true

a]decorticate rigidity is greater than decerebrate rigidity
b]righting reflexes are absent in decerebrate animal
c]visual righting reflex is present in thalamic animal
d]decorticate rigidity is seen only when the animal is at rest

ans given is [a].i cud not find the reason in ganong

also what abt b? i understood from ganong that eventho cortex is abset righting reflexes can be present like that mediated by labyrinth and visual stimuli

pls clarify

dr4jc · Credits: 4396 My Scrapbook

Decerebrate rigidity is seen when the seperation from the body is at the level of the brain stem and decorticate rigidity is when seperation is at the level of the cortex....so which do u think is more dangerous??....decerebrate rite...brain death....righting reflexes can b present in decorticate animal but not in decerbrate since the brain stem(sup colliculus)..is reqd there...

kannan · Credits: 6918 My Scrapbook

yes , i got it, righting reflexes are in most part integrated in midbrain, and in decerebrate animal, section is made at the upper border of pons, so the reflex will be absent.

thanks dr4jc

ahmedasif · Credits: 534 My Scrapbook

hey thanx for adding to my knowledge too dr4jc

doctor189 · Credits: 1560 My Scrapbook

good question

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