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Gurugrah Questions: Your Source for Thoughtful Queries, Your Gateway to Enlightening Answers.
Sequence No.
BIO-2696
Write in brief about mid brain.
Answer:
The portion of brain which is located between the thalams/hypothalamus of the forebrain and pons of hind brain is called the mid brain. Its cavity is very narrow like a canal and it is called cerebral aqueduct/ aqueduct of sylvius or iter which passes through it. The mid brain is divisible into:
1. Cerebral peduncles or crura cerebri: These structures are made up of myelinated neurons that appears like a stalk. They connect the cerebrum with the spinal cord.
2. Corpora quadrigemina: These structures are made up of grey matter forming four lobes globular (round) structures behind aqueduct/at the dorsal portion of the midbrain. Each swelling/lobe is terms as colliculus and collectively called corpora quadrigemina.
The upper - superior colliculi are associated with vision and lower - inferior colliculi are with hearing reflex sentres.
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BIO-2696
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