Brain Cerebrum Question And Answers

Cerebrum And Functional Areas

Question 1: Define the cerebrum and discuss the surfaces of the cerebral hemisphere.

Answer. The cerebrum is the largest part of the brain. It is divided into two halves by a median longitudinal cerebral fissure. Each half is called the cerebral hemisphere. The cerebrum is highly evolved in human beings.

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Surfaces Of the Cerebral Hemisphere. Each cerebral hemisphere has three surfaces.

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Superolateral Surface: It is convex in conformity with the shape of the skull cap. It is the most convex and most extensive of the three surfaces.

Medial Surface: It is flat and vertical. It is separated from its fellow on the opposite side by the falx cerebri lying in the median longitudinal fissure, but below the falx cerebri, the two hemispheres are joined together by a large bundle of white fibres – the commissure called the corpus callosum. In a separated cerebral hemisphere, the corpus callosum is seen as a C-shaped mass of white fibres.

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Inferior Surface: It is uneven to adopt the floors of the anterior and middle cranial fossae. It is divided by a deep horizontal fissure (the stem of the lateral sulcus) into an anterior orbital part (related to the floor of the anterior cranial fossa) and a posterior tentorial part (related to the floor of the middle cranial fossa and the upper surface of the tentorium cerebelli).