The forebrain is the front and largest part of the human brain. It has three parts: the cerebrum (the big thinking part), the thalamus (a relay station for sensory and motor signals), and the hypothalamus (the control centre for hunger, thirst, body temperature and some hormones). Memory hook: "Cerebrum thinks, Thalamus relays, Hypothalamus keeps the body balanced."
The forebrain has three parts: the cerebrum (largest, with grey-matter cortex and two hemispheres joined by the corpus callosum), the thalamus (relay centre for sensory and motor signals), and the hypothalamus (controls temperature, hunger, thirst and secretes hypothalamic hormones).
Your doubts, answered
Is the cerebrum part of the forebrain, or is it separate?
The cerebrum IS part of the forebrain. NCERT clearly says the forebrain consists of cerebrum, thalamus and hypothalamus. The cerebrum is just the largest of these three parts, so students wrongly treat it as a separate main division. Remember: brain = forebrain + midbrain + hindbrain, and cerebrum sits inside the forebrain.
What is the difference between thalamus and hypothalamus?
The thalamus is a major coordinating (relay) centre for sensory and motor signalling. The hypothalamus lies at the base of (just below) the thalamus and controls body temperature, the urge for eating and drinking, and has neurosecretory cells that make hypothalamic hormones. Simple memory: 'hypo' means below, so hypothalamus is below the thalamus and does the body-maintenance jobs.
Which part of the forebrain controls hunger, thirst and body temperature?
The hypothalamus. It contains centres that control body temperature, and the urge for eating (hunger) and drinking (thirst). It also releases hypothalamic hormones from neurosecretory cells. Students often wrongly write cerebrum or thalamus here, but for hunger, thirst and temperature the answer is always the hypothalamus.
Is the corpus callosum grey matter or white matter?
The corpus callosum is a tract of nerve fibres (myelinated fibres) connecting the two cerebral hemispheres, so it is white matter. Grey matter is the cerebral cortex (the outer layer where neuron cell bodies are concentrated). White matter lies inside and is white because of the myelin sheath on the fibres.
Does the limbic system control movement?
No. This is a classic NEET trap. The limbic system, together with the hypothalamus, regulates sexual behaviour and emotional reactions (excitement, pleasure, rage, fear) and motivation. It does NOT control movement. Pairing 'limbic system' with 'controls movement' is wrong.
Where exactly does the cerebrum lie compared to the thalamus?
The cerebrum wraps around the thalamus. NCERT states the cerebrum wraps around a structure called the thalamus, which is the major coordinating centre for sensory and motor signalling. So the thalamus is deep inside, covered by the cerebrum.
⚠️ The NEET trap ✗ The limbic system controls body movement, and the corpus callosum is grey matter. ✓ The limbic system (with the hypothalamus) controls emotions, sexual behaviour and motivation, not movement. The corpus callosum is white matter (a nerve-fibre tract joining the two hemispheres); grey matter is the cerebral cortex. 🧠 NTA loves swapping 'limbic system' functions and grey/white matter. Emotions = limbic; cell bodies (cortex) = grey; myelinated fibres = white.
Real NEET questions
NEET 2024
Statement I: The cerebral hemispheres are connected by a nerve tract known as corpus callosum. Statement II: The brain stem consists of the medulla oblongata, pons and cerebrum. Choose the most appropriate answer.
A · Both Statement I and Statement II are incorrect.
B · Statement I is correct but Statement II is incorrect. ✓
C · Statement I is incorrect but Statement II is correct.
D · Both Statement I and Statement II are correct.
Solution: Statement I is correct: the two cerebral hemispheres are joined by the corpus callosum, a tract of nerve fibres. Statement II is incorrect: the brain stem is made of midbrain, pons and medulla oblongata, not cerebrum. The cerebrum belongs to the forebrain.
NEET 2018
Which of the following structures or regions is incorrectly paired with its functions?
A · Hypothalamus: production of releasing hormones and regulation of temperature, hunger and thirst.
B · Limbic system: consists of fibre tracts that interconnect different regions of brain; controls movement. ✓
C · Medulla oblongata: controls respiration and cardiovascular reflexes.
D · Corpus callosum: band of fibres connecting left and right cerebral hemispheres.
Solution: The limbic system does not control movement. Along with the hypothalamus it regulates sexual behaviour, emotional reactions (excitement, pleasure, rage, fear) and motivation. So this pairing is incorrect; the other three pairings are correct.
NEET 2023 Phase 1
The parts of human brain that help in regulation of sexual behaviour, expression of excitement, pleasure, rage, fear etc. are:
A · Limbic system & hypothalamus ✓
B · Corpora quadrigemina & hippocampus
C · Brain stem & epithalamus
D · Corpus callosum and thalamus
Solution: The inner parts of the cerebral hemispheres plus deep structures like the amygdala and hippocampus form the limbic system. Together with the hypothalamus it regulates sexual behaviour and emotions such as excitement, pleasure, rage and fear.
Solved Neural Control and Coordination NEET PYQs
Try the real previous-year questions from this chapter — each with the answer and a full solution.
The forebrain consists of the cerebrum, the thalamus and the hypothalamus. The cerebrum is the largest part of the human brain.
What connects the two cerebral hemispheres?
A tract of nerve fibres called the corpus callosum connects the left and right cerebral hemispheres. Because it is made of myelinated fibres, it is white matter.
What is the function of the thalamus?
The thalamus is a major coordinating (relay) centre for sensory and motor signalling. The cerebrum wraps around it.
What does the hypothalamus control?
The hypothalamus controls body temperature, the urge for eating (hunger) and drinking (thirst). It also has neurosecretory cells that secrete hypothalamic hormones.
What is the difference between grey matter and white matter in the cerebrum?
Grey matter is the cerebral cortex, where neuron cell bodies are concentrated, giving a greyish colour. White matter is the inner part where fibres are covered with myelin sheath, giving a white appearance.
