Question

Choose the correct term from the key to respond to the statements describing various brain areas.
Key:
a. Cerebellum
b. Corpora quadrigemina
c. Corpus callosum
d. Striatum
e. Hypothalamus
f. Medulla
g. Midbrain
h. Pons
i. Thalamus
(1) basal nuclei involved in fine control of motor activities
(2) region where there is a crossover of fibers of descending pyramidal tracts
(3) control of temperature, autonomic nervous system reflexes, hunger, and water balance
(4) houses the substantia nigra and cerebral aqueduct
(5) relay stations for visual and auditory stimuli input; found in midbrain
(6) houses vital centers for control of the heart, respiration, and blood pressure
(7) brain area through which all the sensory input is relayed to get to the cerebral cortex
(8) brain area most concerned with equilibrium, body posture, and coordination of motor activity

Accepted Answer

Step 1: Identify the brain area associated with basal nuclei involved in fine control of motor activities. Recall that basal nuclei (or basal ganglia) are clusters of neurons that regulate voluntary motor control and procedural learning. From the key, the term 'Striatum' (d) corresponds to this function. Step 2: Determine the brain region where there is a crossover of fibers of descending pyramidal tracts. This crossover, known as decussation, occurs in the medulla oblongata, which controls vital autonomic functions. From the key, 'Medulla' (f) is the correct choice. Step 3: Find the brain area responsible for control of temperature, autonomic nervous system reflexes, hunger, and water balance. These functions are regulated by the hypothalamus, so select 'Hypothalamus' (e). Step 4: Identify the brain area that houses the substantia nigra and cerebral aqueduct. Both structures are located in the midbrain, so choose 'Midbrain' (g). Step 5: Recognize the relay stations for visual and auditory stimuli input found in the midbrain. These are the corpora quadrigemina, so select 'Corpora quadrigemina' (b). Step 6: Determine the brain area housing vital centers for control of the heart, respiration, and blood pressure. These centers are located in the medulla, but since medulla is already used, confirm the correct match is 'Medulla' (f). Step 7: Identify the brain area through which all sensory input is relayed to reach the cerebral cortex. This is the thalamus, so select 'Thalamus' (i). Step 8: Find the brain area most concerned with equilibrium, body posture, and coordination of motor activity. This is the cerebellum, so choose 'Cerebellum' (a).

Verified video answer for a similar problem:

Key Concepts

Basal Nuclei and Motor Control

Brainstem Structures and Vital Functions

Sensory Relay and Integration Centers