The ________ are the Four Masses on the Posterior of the Midbrain

Question

The ________ are the four masses on the posterior of the midbrain.
A) cerebral peduncles
B) reticular formation
C) substantia nigra
D) choroid plexuses
E) corpora quadrigemina

Accepted Answer

The structures described in the question are the corpora quadrigemina, which are four rounded masses located on the posterior surface of the midbrain. Choice A (cerebral peduncles) are two large bundles of nerve fibers on the anterior surface of the midbrain. Choice B (reticular formation) is a diffuse network of neurons in the brainstem. Choice C (substantia nigra) is a structure in the midbrain that produces dopamine and is involved in movement. Choice D (choroid plexuses) are clusters of capillaries that produce cerebrospinal fluid, located in the ventricles of the brain.