The Midbrain

Question 1

Two pairs of sensory nuclei located in the roof of the midbrain.

Answer 1

Corpora Quadrigemina

Question 2

Receive visual inputs from the thalamus and controls the reflex movements of the eyes, head and neck in response to these visual stimuli.

Answer 2

Superior Colliculi

Question 3

Receive auditory input from nuclei in the medulla oblongata and pons and controls reflex movements of the head, neck, and trunk in response to these auditory stimuli.

Answer 3

Inferior Colliculi

Question 4

Receives information from the cerebrum and cerebellum and issues subconscious motor commands that affect upper limb position and background muscle tone.

Answer 4

Red Nucleus

Question 5

Contains darkly pigmented cells that adjust activity in the basal nuclei of the cerebrum.

Answer 5

Substantia Nigra

Question 6

Nerve fiber bundles on the ventrolateral surfaces of the midbrain. Contain descending fibers that reach the cerebellum by way of the pons and descending fibers that carry voluntary motor commands issued by the cerebral hemispheres.

Answer 6

Cerebral Peduncles

Question 7

A specialized part of the reticular formation. Stimulation makes you more alert and attentive; damage produces unconsciousness.

Answer 7

Reticular Activating System (RAS)

Question 8

Identify the sensory nuclei contained within the corpora quadrigemina.

Answer 8

The superior colliculi and inferior colliculi.

Question 9

Which area(s) of the midbrain control(s) reflexive movements of the eyes, head, and neck?

Answer 9

The superior colliculi.

Question 10

Cranial nerves III to XII arise from which structure?

Answer 10

They arise from the brainstem