The pars intermedia is a thin band of tissue between the anterior and posterior lobes of the pituitary gland. It is well developed in many animals but small in adult humans, often containing small colloid cysts.
| Location | Pituitary gland in the sella turcica, between the pars distalis and the neurohypophysis |
|---|---|
| Secretes |
|
| Nerve Supply | Hypothalamic nerve fibres |
| Blood Supply | Inferior hypophyseal arteries; Hypophyseal portal veins |
| Venous drainage |
|
Produces small amounts of melanocyte-stimulating hormone; its role in adult humans is limited.
Rathke cleft cysts arise from remnants in this region. They are often found incidentally on MRI and usually need no treatment, but large cysts can cause headache, visual loss or hormone problems.
A benign cyst from embryonic remnants between the pituitary lobes.
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