The Surfaces of the Hemispheres Form Convolutions Called Gyri and Intervening

question 20

Multiple Choice

The surfaces of the hemispheres form convolutions called gyri and intervening furrows called sulci,which serve as anatomic landmarks.Two sulci of particular anatomic importance during surgery are the lateral sulcus,or sylvian fissure,which separates the temporal lobe from the frontal and parietal lobes,and the central sulcus,or fissure of Rolando,which separates the frontal lobe from the parietal lobe.The central sulcus also separates the motor cortex from the sensory cortex.Both the motor and sensory cortices are represented by a map called a homunculus that proportionately shows each body part at the area of the gyri that controls it and illustrates how the number of neurons corresponds to the degree of motor and sensory control required.Select all the true statements about sensory and motor function.

• A) Another name for the homunculus is the dermatome grid.
• B) Areas of fine motor and sensory control have more neurons.
• C) The right motor and sensory cortices control the right side of the body.
• D) The left motor and sensory cortices control the right side of the body.

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