Fill in the Blanks Epithalamus A&POnline version Unit two by Kirsten Storemski 1 epithalamus Habenular activity body humans nuclei rhythms day superior eye night gonad puberty pineal circadian The is to the thalamus . The is involved in emotional and visceral response to orders . The is the of the brain . It is influenced by and length . The pineal body controls , which are the sleep and wake cycles . The pineal body is also involved in the onset of , which would influence in . In mammals , it controls seasonal estrus cycles in many mammals .