External Anatomy of Brain- Diencephalon

Question 1

Diencephalon

Answer 1

Composed of the thalamus and hypothalamus; thalamus is viewed only in saggital section

Question 2

Hypothalamus

Answer 2

Ventral, superior to optic chiasma and infundibulum. Anterior to cerebral peduncles; posterior region comprised of mammillary body. Functions in autonomic nervous system and control, some emotions, basic body maintenance and biological rhythm

Question 3

Mammillary body

Answer 3

Rounded prominence (paired in humans) posterior to optic chiasma. Functions as relay station for reflexes related to smell

Question 4

Infundibulum

Answer 4

Tube attaching pituitary gland to hypothalamus

Question 5

Pituitary Gland

Answer 5

On ventral surface of brain; not a part of diencephalon, but connects to hypothalamus. Secretes hormones controlling many functions

Question 6

Pineal Gland

Answer 6

Single, rounded structure, located dorsally, medial, and anterior to superior colliculi. Function is not well known and is not part of diencephalon.
Pull cerebellum downward to view.