Question

The folds of the surface of the cerebrum ________.

1) are bathed in spinal fluid.
2) form a network of blood vessels over the brain.
3) increase the surface area of the cerebrum.
4) are called sulci.
5) consist of axons and dendrites of neurons.

Answer 1

The folds on the surface of the cerebrum are designed to increase its surface area, enhancing the brain's functionality. These folds, known as gyri and sulci, are crucial for the cerebral cortex's organization into different functional areas.

Step-by-step explanation:

The folds of the surface of the cerebrum increase the surface area of the cerebrum. These folds consist of hills known as gyri and valleys known as sulci. This increased surface area allows for a greater number of neurons in the cerebral cortex, which enhances brain function.

The sulci and gyri form important landmarks that divide the brain into functional centers. Moreover, these structures are nestled in a protective layer called the pia mater that conforms to their contours. While the cerebrum is protected by the meninges and bathed in cerebrospinal fluid (CSF), these specific folds themselves do not form a network of blood vessels, nor are they comprised solely of axons and dendrites. The folds are also distinct from larger crevasses like the longitudinal fissure that separate the brain into hemispheres.