Part A A stoke is caused by bleeding in the brain that disrupts blood flow and s

Question

Part A A stoke is caused by bleeding in the brain that disrupts blood flow and subsequently damages the surrounding brain tissue. Assuming that the following symptoms are being caused by a stroke, diagnose where a stroke is most likely to have occurred given the altered functions listed below. Altered function: Can still hear but loss of auditory reflex O Temporal lobe Frontal lobe Occipital lobe Inferior colliculus of the corpora quadrigemina Submit My Answers Give Up Part B Where might a stroke have occured if sleep becomes distrupted? Epithalamus Midbrain O Pons Thalamus Submit My Answers Give Up

Explanation / Answer

PART A - inferior colliculus of the corpora quadrigemina

colliculus consists of single layer of neurons to
which the lateral lemniscus (auditory fibers) synapses.

Inferior colliculus is the center for auditory reflexes

PART B - PONS

Complex pathways between the reticular formation
of brainstem, diencephalon and cerebral cortex are
involved in the onset and maintenance of sleep.
However, two centers which induce sleep are located
in brainstem:
1. Raphe nucleus
2. Locus ceruleus of pons.
Recently, many more areas that induce sleep are
identified in the brain of animals. Inhibition of ascending
reticular activating system also results in sleep.
1. Role of Raphe Nucleus
Raphe nucleus is situated in lower pons and medulla.
Activation of this nucleus results in non-REM sleep. It is
due to release of serotonin by the nerve fibers arising
from this nucleus. Serotonin induces non-REM sleep.
2. Role of Locus Ceruleus of Pons
Activation of this center produces REM sleep. Noradrenaline
released by the nerve fibers arising from
locus ceruleus induces REM sleep?.

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