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The Brain. WALT That there are distinct areas of the brain That each area has a different function. 27.5.2 Structure of The Brain. Longitudinal section through a human brain. Regions and Functions of the Brain - The brain is divided into 3 regions:

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the brain
The Brain
  • WALT
  • That there are distinct areas of the brain
  • That each area has a different function

27.5.2 Structure of The Brain

Longitudinal section through a human brain

Regions and Functions of the Brain

- The brain is divided into 3 regions:

the forebrain, midbrain & the hindbrain

1. The Forebrain

The cerebrum is divided into two cerebral hemispheres connected by nerve fibres

The surface is folded to increase the surface area for increased co-ordination

This is the centre for thinking, memory, reasoning, imagination, learning & voluntary actions

areas of the brain
Areas of the brain

sensory areas receive impulses from the receptors;

removal of these areas results in loss of the senses

motor areas send impulses to the effectors; if these areas are damaged, no responses will be evoked;

association areas correlate impulses from different receptors and assist in producing the appropriate responses

the midbrain
The Midbrain

This includes the optic lobes for vision

The floor is the hypothalamus essentialfor homeostasis:

main controlling region for the autonomic nervous system;

two centres (sympathetic & parasympathetic);

controls complex patterns of behaviour such as feeding, sleeping;

monitor composition of blood;

acts as an endocrine gland

the hindbrain
The Hindbrain

The cerebellum: a centre for muscular co ordination and body balance

The medullar oblongata: This is the reflex centre for controlling involuntary actions such as breathing, heartbeat, swallowing, coughing, sneezing, and salivation;

Any damage of the medulla oblongata may lead to death

internal structure of the brain
InternalStructure of the Brain

-The grey matter: This is the outer layer of the brain and consists of nerve cell bodies only

-The white matter: This is inside the brain and consists of nerve fibres only

Remember--This is the reverse of the medulla oblongata & spinal cord, the distribution of grey and white matters is the reverse with the grey matter inside and the whiote matter outside