The surface of human cortex
A) is smooth in a human brain.
B) is convoluted by grooves and bulges.
C) contains cell bodies that give rise to a whitish appearance.
D) is about 250 square feet in area.
E) is about 30 mm in thickness.

Question

Quizplus · Accepted Answer

The surface of human cortex is convoluted by grooves and bulges known as gyri and sulci. This increases the surface area of the cortex to fit more neurons within the limited space of the skull.

Answer: E
 The thickness of the human cortex varies between regions but is approximately 2-4 mm on average. Therefore, option E stating that it is about 30mm in thickness is incorrect.

The Surface of Human Cortex