Neuroanatomy Draw It To Know It

25. Sleep and Wakefulness 445

Pineal gland

Optic

Chiasm

Descending

hypothalamo-

spinal

pathway

Suprachiasmatic

nucleus

Paraventricular

nucleus

Superior

cervical

Retino- ganglion

hypothalamic

pathway

Melatonin

production

& release

Presympathetic

fibers

Postsympathetic

fibers

DRAWING 25-2 Suprachiasmatic Circuitry