Question

multiple choice 2 points
the right and left cerebral hemispheres are separated from each other by _______
many sulci
the brainstem
many gyri
the corpus callosum
the longitudinal fissure

Explanation:

Identify the anatomical question

The question asks for the anatomical structure that separates the right and left cerebral hemispheres of the brain.

Analyze the anatomical structures

• Many sulci: Sulci are shallow grooves on the surface of the cerebral cortex that separate adjacent gyri, not the two hemispheres.
• The brainstem: This structure connects the cerebrum and cerebellum to the spinal cord and does not separate the hemispheres.
• Many gyri: Gyri are the ridges or folds on the brain's surface, not separating structures.
• The corpus callosum: This is a thick band of nerve fibers that connects the left and right hemispheres, allowing them to communicate, rather than separating them.
• The longitudinal fissure: This is the deep groove that physically separates the left and right cerebral hemispheres along the midline.

Determine the correct option

The deep midline groove separating the two cerebral hemispheres is the longitudinal fissure.

Answer:

• many sulci
• the brainstem
• many gyri
• the corpus callosum
• the longitudinal fissure (Correct answer)