BIO LAB Exam #4

Front

What cranial nerve carries visual information from the eyeball to the brain?

Back

Optic nerve

Front

What region acts as a relay center for sensory messages ascending to the cerebrum?

Back

Thalamus

Front

What are arachnoid granulations?

Back

Knoblike projections that protrude superiorly through the dura mater to absorb cerebrospinal fluid into venous blood.

Front

What percentage of total brain mass do the cerebral hemispheres account for?

Back

About 83%.

Front

What is the surface of the cerebral hemispheres marked by?

Back

Shallow grooves called gyri and elevated ridges called sulci.

Front

Which region of the brain contains gyri and sulci?

Back

Cerebrum.

Front

What is the function of the optic nerve?

Back

To transmit visual information from the retina to the brain.

Front

What is the role of the thalamus in the brain?

Back

To act as a relay center for sensory information.

Front

What is the dura mater?

Back

The outermost layer of the meninges that surrounds the brain and spinal cord.

Front

What is the significance of the longitudinal fissure?

Back

It separates the left and right cerebral hemispheres.