23.4 Epithalamus Flashcards
1
Q
What structure is highlighted?
A
Diencephalon (contains the epithalamus)
2
Q
Where is the epithalamus in relation to the rest of the brain?
A
A small component of the diencephalon at the posterior thalamus
Mainly comprised of the pineal gland
Above the origin of the aqueduct
3
Q
What is the principle molecules secreted by the pineal gland?
A
Melatonin
4
Q
What types of neurons are found in the suprachiasmatic nucleus?
A
GABAergic
5
Q
What stimulates melatonin secretion?
A
*Darkness which stops SCN GABAergic signals
Activates postganglionic sympathetic fibres resulting in melatonin secretion from the pineal gland
