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Question

Name the parts of human forebrain indicating their respective functions.

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Solution

The forebrain is the largest part of the brain most of which is cerebrum. Other important structures include the thalamus, hypothalamus and the limbic system.

The cerebrum is divided into two cerebral hemispheres connected here by a mass of whiter matter known is corpus callosum. Each hemisphere is split into four lobes. The surface of each hemisphere is made up of grey matter known as the cerebral cortex that is folded to increase the surface area, various structures of forebrain are given below

Brain Region Structure FunctionDiencephalonThalamusOrganising sensory informationDiencephalonHypothalamusEndocrine system,thermoregulationDiencephalonPituitaryEndocrine systemTelencephalonCerebral cortexConsciousness, language, etcTelencephalonLimbic systemMemory, motivation, emotionsTelencephalonOlfactory bulb/lobesSmell

Thalamus

The thalamus has many functions including processing and relaying sensory information selectively to various parts of the cerebral cortex, translating signals to the cerebral cortex and also regulating states of sleep and wakefulness. The thalamus plays a major role in regulating arousal levels of consciousness and levels fo activity.

Hypothalamus

The functions of the hypothalamus are mainly related to the overall regulation of the endocrine system and closely related to the pituitary gland.

Pituitary

The function of the pituitary is mainly related to the production of hormones as part of the endocrine system.

Cerebral cortex

The cerebral cortex is essential for memory, attention, awareness, thought, language and consciousness. The cerebral cortex is connected to structures such as the thalamus and the basal ganglia, sending information to them along efferent connections and receiving information from them via afferent connections.

Motor cortex

The motor cortex areas of the brain are located in both hemispheres of the cortex are related to controlling voluntary movements, especially fine movements.

Sensory Areas

The sensory areas are the areas that receive and process information from the senses. Inputs from the thalamus are called primary sensory areas where vision hearing and touch are processed. The two hemispheres of the cerebral cortex receive information from the opposite (contal lateral) side of the body.

The association areas of the brain function to produce a perception of the world enabling an animal to interact with their environment effectively. The frontal lobe or prefrontal association complex is involved in planning actions and movement.

Limbic system

The limbic system is principally responsible for emotions and the various types of emotion can affect the activity of the Autonomic Nervous System (ANS) facilitated by the hypothalamus.

Olfactory Bulb

The olfactory bulb is responsible for olfaction concerned with the sense of small plays.


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