Step by Step
Ant
Anterior pituitary — makes its own hormones
Controlled by hypothalamic releasing and inhibiting hormones delivered via portal blood. Makes and releases: FSH (follicle stimulating hormone), LH (luteinizing hormone), ACTH (adrenocorticotropic hormone), TSH (thyroid stimulating hormone), GH (growth hormone), and PRL (prolactin) — remembered by the mnemonic "FLAT PiG."
Post
Posterior pituitary — stores, doesn't make
The posterior pituitary does NOT manufacture its own hormones — it stores and releases hormones actually made by hypothalamic neurons. It releases ADH (vasopressin), triggered by increased blood osmolarity or decreased blood pressure, promoting water retention. It also releases oxytocin, triggered during labor (the Ferguson reflex) and breastfeeding (milk letdown).
Hypo
The hypothalamus is the master controller
The hypothalamus receives input from the brain and releases regulatory hormones that control the anterior pituitary, while directly manufacturing ADH and oxytocin itself (which the posterior pituitary simply stores and releases).
Key
Why this distinction matters
Understanding that the anterior pituitary makes its own hormones (under hypothalamic control via releasing/inhibiting hormones) while the posterior pituitary merely stores hormones made elsewhere (in the hypothalamus) explains why pituitary disorders can affect these two regions very differently.
Applied Walkthrough
1
The hypothalamus produces ADH and oxytocin directly, but rather than releasing them itself, it sends them down to the posterior pituitary for storage and eventual release — meaning the posterior pituitary is really just a storage and release site, not a hormone factory.
2
Meanwhile, the hypothalamus also releases separate regulatory hormones (releasing and inhibiting hormones) that travel via portal blood to the anterior pituitary, instructing it to produce and release its own six hormones: FSH, LH, ACTH, TSH, GH, and PRL.
3
When a woman goes into labor, the Ferguson reflex triggers oxytocin release from the posterior pituitary — even though the oxytocin itself was originally made by hypothalamic neurons, not the pituitary itself.
4
This distinction matters clinically: damage to the anterior pituitary would disrupt hormone production for six different pathways, while damage specifically to the posterior pituitary (or the connection to the hypothalamus) would primarily disrupt ADH and oxytocin release instead.
Exam Application
Exams test whether you can correctly assign each of the eight major pituitary-associated hormones to either the anterior or posterior pituitary, and specifically whether you understand that the posterior pituitary stores hormones made by the hypothalamus rather than manufacturing its own.
⚠ Common Trap
The most common trap is assuming the posterior pituitary manufactures ADH and oxytocin itself — it doesn't; these hormones are actually produced by hypothalamic neurons, and the posterior pituitary simply stores and releases them.
✓ Quick Self-Check
1. What six hormones does the anterior pituitary produce and release?
FSH, LH, ACTH, TSH, GH, and PRL ("FLAT PiG").
Tap to reveal / hide
2. What two hormones does the posterior pituitary release, and where are they actually made?
ADH and oxytocin; both are actually made by hypothalamic neurons, not the posterior pituitary itself.
Tap to reveal / hide
3. What triggers ADH release?
Increased blood osmolarity or decreased blood pressure.
Tap to reveal / hide
4. What triggers oxytocin release?
Labor (the Ferguson reflex) and breastfeeding (milk letdown).
Tap to reveal / hide
5. How does the hypothalamus control the anterior pituitary?
By releasing regulatory (releasing and inhibiting) hormones that travel via portal blood to the anterior pituitary.
Tap to reveal / hide