Histology Guide

virtual histology laboratory

Chapter 13 - Endocrine Glands

Endocrine glands synthesize and secrete products, called hormones, into the blood where they are transported to other tissues. They bind with receptors on target cells and alter their function.

Fig 006 Endocrine Glands


The pituitary gland produces and regulates hormones that affect processes throughout the body.

MH 149 Pituitary

MH 150a Pituitary



The thyroid gland produces hormones that primarily influence the metabolic rate and protein synthesis. It is unique in that it stores its hormones extracellularly in large follicles.

MH 151 Thyroid


The parathyroid glands secrete parathyroid hormone that regulates the amount of calcium in the blood and within the bones.

MH 154 Parathyroid


MHS 209 Thyroid-Parathyroid-Thymus


The adrenal glands produce a variety of hormones including adrenaline and the steroids aldosterone and cortisol.

MH 155a Adrenal

MHS 216 Adrenal

Pancreatic Islets

Pancreatic islets (or islets of Langerhans) are 'islands' of endocrine cells located within the pancreas. They secrete hormones (insulin and glucagon) important in regulation of glucose in the blood.

MH 131 Pancreas

MH 133 Pancreas

(aldehyde fuschin)

MHS 211 Pancreas