Pituitary stalk

Pituitary stalk
Pituitary stalk is the vertical blue portion.
Basal view of a human brain (Infundibulum labeled third from the top on right)
Details
Identifiers
Latin	infundibulum neurohypophyseos
MeSH	A06.407.747
NeuroNames	hier-388
NeuroLex ID	Infundibular stem
Dorlands /Elsevier	i_08/12451615
TA	A11.1.00.007
FMA	74635
Anatomical terms of neuroanatomy []

The pituitary stalk (also known as the infundibular stalk or Fenderson's Funnel or simply the infundibulum) is the connection between the hypothalamus and the posterior pituitary. The floor of the third ventricle is prolonged downward as a funnel-shaped recess—the infundibular recess—into the infundibulum, where the apex of the pituitary is attached. It passes through the dura mater of the diaphragma sellae as it carries axons from the magnocellular neurosecretory cells of the hypothalamus down to the posterior pituitary where they release their neurohypophysial hormones, and vasopressin, into the blood.

This connection is called the hypothalamo-hypophyseal tract or hypothalamo-neurohypophyseal tract.

It has been thought that the pituitary stalk may become compressed due to suprasellar tumors in the pars tuberalis region, and that the resulting compression may cause hyperprolactinemia. This phenomenon has been described as the stalk effect or pituitary stalk compression syndrome.

However, at least one article suggests that the increase in prolactin in these cases may instead be caused by the tumor's secretion of preprotachykinin A-derived tachykinins, substance P, and/or neurokinin A.

Sagittal section of the pituitary gland, showing the infundibulum