Endocrine System Comprehensive
Study Guide
1. The Pancreas
● Functional Anatomy:
○ Unique Status: It is the only organ with both Endocrine (secretes
insulin/glucagon into blood) and Exocrine (secretes digestive enzymes into
ducts) functions.
○ Comparison: Ovaries, Thyroid, and Pituitary are strictly endocrine glands.
● Acute Pancreatitis:
○ Pathology: Inflammation causing autodigestion and pancreatic necrosis.
○ Clinical Manifestations: Jaundice (biliary obstruction) and Decreased
Exocrine Function.
○ Rule Out: Do not confuse with Spider Angiomas (sign of Liver Cirrhosis) or
Thrombocytopenia.
2. The Pituitary Gland ("The Master Gland")
● Anatomy:
○ Anterior Pituitary: Controls the Thyroid, Adrenal Cortex, and Reproductive
organs. Secretes FSH & LH (regulate ovaries/testes).
○ Posterior Pituitary: Secretes ADH (fluid balance) and Oxytocin.
● Disorders & Tumors:
○ Prolactinoma: A tumor (40% of pituitary tumors) secreting excess
Prolactin.
■ Symptoms: Infertility, Amenorrhea, and Hirsutism (excess hair).
■ Key Differentiator: Unlike Cushing's, these patients typically maintain a
Normal Body Weight.
○ Trauma/Radiation Damage: The gland is vulnerable to brain injury or
head/neck radiation.
■ Pan-Hypopituitarism Signs:
■ Reproductive: Low libido, Hot flashes, Amenorrhea (Low FSH/LH).
■ Renal: Polyuria & Excessive Thirst (Diabetes Insipidus due to low
ADH).
■ Metabolic: Unexplained weight gain (Secondary Hypothyroidism).
● Differentiation from other glands:
○ Pineal: Secretes Melatonin (Circadian rhythm).
○ Parathyroid: Regulates Calcium.
○ Thyroid: Regulates Cell growth/metabolism (T3/T4).
Study Guide
1. The Pancreas
● Functional Anatomy:
○ Unique Status: It is the only organ with both Endocrine (secretes
insulin/glucagon into blood) and Exocrine (secretes digestive enzymes into
ducts) functions.
○ Comparison: Ovaries, Thyroid, and Pituitary are strictly endocrine glands.
● Acute Pancreatitis:
○ Pathology: Inflammation causing autodigestion and pancreatic necrosis.
○ Clinical Manifestations: Jaundice (biliary obstruction) and Decreased
Exocrine Function.
○ Rule Out: Do not confuse with Spider Angiomas (sign of Liver Cirrhosis) or
Thrombocytopenia.
2. The Pituitary Gland ("The Master Gland")
● Anatomy:
○ Anterior Pituitary: Controls the Thyroid, Adrenal Cortex, and Reproductive
organs. Secretes FSH & LH (regulate ovaries/testes).
○ Posterior Pituitary: Secretes ADH (fluid balance) and Oxytocin.
● Disorders & Tumors:
○ Prolactinoma: A tumor (40% of pituitary tumors) secreting excess
Prolactin.
■ Symptoms: Infertility, Amenorrhea, and Hirsutism (excess hair).
■ Key Differentiator: Unlike Cushing's, these patients typically maintain a
Normal Body Weight.
○ Trauma/Radiation Damage: The gland is vulnerable to brain injury or
head/neck radiation.
■ Pan-Hypopituitarism Signs:
■ Reproductive: Low libido, Hot flashes, Amenorrhea (Low FSH/LH).
■ Renal: Polyuria & Excessive Thirst (Diabetes Insipidus due to low
ADH).
■ Metabolic: Unexplained weight gain (Secondary Hypothyroidism).
● Differentiation from other glands:
○ Pineal: Secretes Melatonin (Circadian rhythm).
○ Parathyroid: Regulates Calcium.
○ Thyroid: Regulates Cell growth/metabolism (T3/T4).
