KERALA PSC / CDPO / BIOLOGY / BRAIN / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

 

KERALA PSC / CDPO / BIOLOGY / BRAIN / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

KERALA PSC / CDPO / BIOLOGY / BRAIN / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

·      The brain is protected by cranial bone and meninges.

·      The brain is marked into forebrain, mid brain and hind brain.

·      The forebrain consists of cerebrum, the largest part of human brain

·      Cerebral cortex is outer layer of cerebrum. It is made of grey matter and contains many layer of nerve cells.

·      Cerebral hemisphere is divided into frontal, parietal, temporal and occipital lobes.

·      The surface of cerebral hemisphere shows many convolutions called Gyri separated by depressions called Sulci.

·      The Gyri increases the surface area of cortex to accommodate more nerve cells.

·      The general sensory or somaesthetic area in parietal lobe perceive general sensation, viz., pain, touch and temperature.

·      The motor area in frontal lobe controls voluntary movement of muscles.

·      The premotor area in frontal lobe is the highest centre of involuntary movements of muscles.

·      The visual and auditory areas are in occipital lobe and are centres for visual and hearing sensation.

·      Association area in the frontal lobe is responsible for association between various sensations and movements.

·      Memory, intelligence, and judgement depends on coordinated and integrated activities of different cortical centres.

·      Hypothalamus: contain higher nerve centres for temperature regulation, hunger, thirst and emotional function. It secretes neuro hormones which control secretions of anterior pituitary hormones. It synthesizes the posterior pituitary hormones.

·      The medulla oblongata controls the involuntary actions

·      The central control of respiratory activity in human body is exercised by medulla oblongata

·      Medulla oblongata has the centres, for regulating the working of the heart contraction of blood vessels and respiratory and digestive movements.

·      The thermoregulatory centre of the human body is hypothalamus

·      EEG (Electro Encephalogram) is used to record changes in the electric potential in various areas of brain.

·      Biological death of a patient means the death of tissues of the brain.

·      Encephalitis is caused by virus

·      Disorder of brain affecting recognition of letters and words is Dyslexia

·      The final weight of the brain in an adult male is 1.4kg and 1.3kg in case of a woman.

·      Cerebellum is second largest portion of brain located at the base, under the cerebrum.

·      Cerebellum contains centres for the maintenance of posture and equilibrium of body and for the muscle tone. It also modulates and moderate voluntary action initiated by the cerebral cortex.

·      Brain stem consists of pons and medulla oblongata. It controls vegetative actions.

KERALA PSC / CDPO / BIOLOGY / BRAIN / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY