If the human brain didn't have so many deep crevasses and wrinkles in the cortex, then the:
A) amygdala would not be able to regulate the person's initial emotional responses.
B) fetus would die prenatally because the hypothalamus couldn't regulate the autonomic nervous system.
C) newborn's head would be too large to fit through the mother's birth canal.
D) person would have difficulty performing bodily functions that are not consciously willed.

Question

Quizplus · Accepted Answer

The deep crevasses and wrinkles in the cortex, called sulci and gyri, allow for the brain to fold and compress, thus making it possible for a larger brain to fit through the narrow birth canal during delivery. If the brain were flat, as in some other animals, the newborn's head would be too large to pass through the birth canal, resulting in difficult or fatal delivery. The other choices are not related to the function of sulci and gyri in the brain's structure.

If the Human Brain Didn't Have So Many Deep Crevasses