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Kolb and Whishaw discuss and provide pictures of the infundibulum on [K&W: 412-416]. 

Pituitary stalk (Wiki)   

Brain: Pituitary stalk
Pituitary gland representation.PNG
Pituitary stalk not labeled, but is the vertical blue portion.

The pituitary stalk (also known as the infundibular stalk 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, and to the apex of the latter the hypophysis or pituitary is attached.[1]

It carries axons from the magnocellular neurosecretory cells of the hypothalamus down to the posterior pituitary where they release their neurohypophysial hormones, oxytocin and vasopressin, into the blood.

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

File:Gehirn, basal - beschriftet lat.svg

Basal view of a human brain
(Infundibulum labeled third from the top on right)