1.

Question : Describe the structure of cerebrum add a note on its functions.

Answer»

Solution :1. Structureof cerebrum :
(1) Cerebrum is the largest part of the brain. It FORMS 80-85 % of the brain.
(2) A median longitudinal fissure dividesthe cerebruminto twocerebral HEMISPHERES. These hemispheresare interspheres are interconnected by athick band of transversenervefibrescalledcorpuscallosum.
(3) The outerpart ofcerebrumis called cortex while theinner part is called medulla.

(4) The roof of cerebrumis called pallium. Pallium is highly folded formingsulci and gyri. Sulci are depressionswhile gyri are ridges. The gyriincrease the surfacearea of cerebal cortex.
(5) The ventrolateral walls of cerebrum arethickenedand are called corporastriata.
(6) The cerebral cortexhas three deep sulci, the central , lateraland parieto-oocipital.
(7) These sulci dividethe cerebral hemisphere into four lobes. These are frontal, partietal, occipital and temporal lobes.
(8) The central sulcus separates frontaland parietal lobes. the lateral sulcusseparatesparietaland temporal lobes and the parieto-occipital sulcusseparatesparietaland occipital lobe.
(9) There are three functionalareas in cerebral cortex. viz., sensory,associationand motor area. Sensoryarea analyzesthe sensoryinputs. Association area processesthe information .Motorarea sendsthe motor outputs.
2. Functional areasof cerebrum are :
(1) General motor area and general sensory area.
(2) Association area
(3) Broca's area
(4) Sensory speech areaor Wernick's area.
The functionsgiven below are associatedwith these areas .
(6) Sensory visual area
(7) AUDITORY area.
3. Functions of cerebrum :
(1) The cerebrum CONTROLS the voluntary activities.
(2) The cerebrumperceives various sensorystimuli receivedthroughvision. taste , smell , sound , touch, speech , etc.
(3) It isthe centre of memory, willpower , intelligence resoning and learning.
(4) The cerebrumis the centre for emotions, thoughtsand fellings, pain , plessure, fear, fatigue,pressure,temperature , etc.
(5) It is also the centre for micturition, defecation , weeping , laughing etc.


Discussion

No Comment Found

Related InterviewSolutions