A transverse section of the adult spinal cord shows white matter in the periphery, gray matter inside, and a tiny central canal filled with CSF at its center. Surrounding the canal is a single layer of cells, the ependymal layer.
Cortisol is commonly referred to as the stress hormone.. The hormone is secreted by the adrenal glands and released into the bloodstream as a fight or flight response to stress. The highest quantities of cortisol are produced in the early morning hours and then production slowly tapers off throughout the day.
High Cortisol Levels (Hypercortisolism, Cushing Syndrome) The Hormone Cortisol. Cortisol is the main type of glucocorticoid â a group of hormones secreted by the outer cortex portion of the adrenal glands that sit on top of each kidney. These glucocorticoids are sterol hormones and cortisol (hydrocortisone) is a natural corticosteroid.