Which makes up the structure of the hypothalamus?

The structure of the hypothalamus is made up of nerve endings of neurosecretory cells, mamillary bodies, third ventricle, and the optic chiasm. Hypothalamus is the part of the nervous system that connects the endocrine system to it. 

The eruption of Mount Saint Helens has proved to have dramatically change the abiotic and biotic factors of its environment. As what was shown in the image just  24 years from its eruption, we can already observe that animal life began to populate the region due to its sufficient vegetation.