Question: what is the main parts of the endocrine system?
Answer: Hypothalamus. The hypothalamus is located at the base of the brain, near the optic chiasm ﻿﻿﻿where the optic nerves behind each eye cross and meet. ... 
Pineal body. ... 
Pituitary. ... 
Thyroid and parathyroid. ... 
Thymus. ... 
Adrenal gland. ... 
Pancreas. ... 
Ovary.