Histology of the Endocrine System Flashcards
What is an exocrine gland?
Secrete onto a surface either directly or via a duct
What is an endocrine gland?
Secrete internally, usually into cardiovascular gland, ductless gland.
Hormone
What are exclusive Endocrine Glands?
Hypothalamus Pituitary gland Pineal gland Thyroid gland Parathyroid gland Adrenal gland Islets of Langerhans
What organs contain hormone-secreting glands?
Heart
Kidney
Thymus
Testes/Ovaries
What role does the Hypothalmus play?
Main visceral control center for the body:
Controls body temp, hunger, sleep/wake, thirst, sexual behavior, endocrine
Homeostasis
What are the 3 divisions of the Anterior Pituitary gland?
Pars distalis
Pars intermedia
Pars tuberaalis
What are the 7 hormones secreted by the Anterior Pituitary?
Human Growth Hormone (HGH) Thyroid-stimulating hormones (TSH) Follicle-stimulating hormones (FSH) Lutinizing hormone (LH) Prolactin (PRL) Adrenocorticotropic hormone (ACTH) Melanocyte-stimulating hormone (MSH)
What are the 2 divisions of the Posterior Pituitary gland?
Pars nervosa
Infundibulum
What are the hormones secreted by the Posterior Pituitary?
Oxytocin (OT) Antidiuretic hormone (ADH)
What are the 2 divisions of the Adrenal glands?
Cortex
Medulla
What does the Cortex of the Adrenal gland make?
Steroids
What does the Medulla of the Adrenal glands make?
Catecholamines
What are the Islets of Langerhans?
Endocrine portion of the pancreas
What are the cells of the Islets of Langerhan?
beta-cells
alpha-cells
delta-cells
Beta-cells of Islets of Langerhans
Make up 70% of Islets, towards center
Make insulin
Alpha-cells of Islets of Langerhans
Make up 17%, toward periphery
Make glucagon
Delta-cells of Islets of Langerhans
Make up 7%, toward periphery
Make somatostatin
Inhibits insulin and glucagon
Thyroid gland
Lobulated gland
Made up of follicles
Borders are Follicular cells
Follicular cells
In Thyroid gland
Secrete T3 and T4 cells
Parafollicular glands
Larger than follicular cells Make calcitonin (CT)
Parathyroid gland
Make Parathyroid hormone (PTH)