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- This is part of brain which connects spinal part.
- Comprises of Midbrain, Pons and Medulla oblongata.
Midbrain:
- Small area of brain which form < 1% of total brain.
- Formed of four lobes collectively known as Corpora quadrigemina.
- Anterior pairs called superior caniculus which control movement of eye and heat to locate objects.
- Posterior pairs called inferior caniculus which control movement of ear and head to locate sound.
- Two cranial nerve exit from midbrain.
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Pons:
- Part of hindbrain
- It is solid mass that connect cerebral cortex to medulla oblongata and cerebellum.
- Co-ordinates two sides of cerebral hemisphere
- Regulates sleep, swallowing, facial expressions, etc.
- Blood supply: pontine arteries, branches of basilar artery.
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Medulla oblongata:
- Posterior most part of brain
- Control different involuntary activities like cardiac centre – control heartbeat, respiratory centre – control respiration, salivary centre – control salivation, etc
- 4 cranial nerve exit from here
- Blood supplies of medulla are anterior spinal artery and posterior inferior cerebellum.