Final answer:
The infundibulum is the narrow stalk that connects the hypothalamus to the pituitary gland, which has two lobes: the anterior lobe and the posterior lobe.
Step-by-step explanation:
The infundibulum, a narrow stalk, connects the hypothalamus to the pituitary gland. The hypothalamus region, which lies inferior and anterior to the thalamus, is a pivotal area of the brain involved in many regulatory functions of the body. It connects to the pituitary gland through the infundibulum. The pituitary gland itself consists of two parts: an anterior lobe and a posterior lobe, both serving different hormonal functions. The anterior lobe is known as the adenohypophysis, while the posterior lobe, along with the infundibulum, is also referred to as the neurohypophysis. The pituitary stalk, another name for the infundibulum, allows blood vessels and nerves to directly connect the hypothalamus with the pituitary, enabling the transport of hormones and neuronal signals between the two structures.