Question:
What are the major parts of the brain ? Mention the function of different parts.
Solution:
Major Parts of Brain
Fore-Brain: Olfactory lobes (2), Cerebral hemispheres (2) or cerebrum, Diencephalon.
Mid-Brain: Cerebral peduncles, Corpora quadrigemina.
Hind Brain: Pons, Cerebellum, Medulla oblongata.
Functions
- Olfactory Lobes: Receive sensation of smell from olfactory epithelium and relay the same to temporal lobes of cerebral hemispheres.
- Cerebral Hemispheres:
- Frontal Lobes: Centres of intelligence, control of movements and facial muscles, speech.
- Parietal Lobes: Taste and cutaneous sensations with some components of speech.
- Temporal Lobes: Hearing, smell, recall of audiovisual memory, some components of speech.
- Occipital Lobes: Sight.
- Diencephalon: Hypothalamus part regulates activity of smooth muscles and functions as control centre for hunger, thirst, fatigue, sleep, sweating, temperature and emotions. Pituitary gland and pineal gland are components of diencephalon.
- Corpora Quadrigemina: Superior – sight reflexes. Inferior – auditory reflexes.
- Cerebellum: Controls posture and equilibrium.
- Pons: Part of respiratory centre.
- Medulla Oblongata: Centre for reflexes, blood pressure, heart beat, breathing.