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Hair follicle: the infundibulum is the cup or funnel in which a hair follicle grows. Infundibulum (heart): The infundibulum of the heart, or conus arteriosus, is the outflow portion of the right ventricle. Lung: The alveolar sacs of the lungs, from which the air chambers (alveoli) open, are also called infundibula.
The pituitary stalk, also known as the infundibular stalk, infundibulum, or Fenderson's funnel, is the connection between the hypothalamus and the posterior pituitary, the posterior lobe of the pituitary gland.
Also known as the infundibulum or pituitary stalk, the infundibular stalk bridges the hypothalamic and hypophyseal systems. The median eminence is only occasionally included as part of the posterior pituitary. Other sources specifically exclude it from the pituitary. [5]
Other structures associated with the hair follicle include the cup in which the follicle grows known as the infundibulum, [8] the arrector pili muscles, the sebaceous glands, and the apocrine sweat glands. Hair follicle receptors sense the position of the hair. Attached to the follicle is a tiny bundle of muscle fiber called the arrector pili.
However, only in mammals does the posterior pituitary have a compact shape. In lungfish, it is a relatively flat sheet of tissue lying above the anterior pituitary, but in amphibians, reptiles, and birds, it becomes increasingly well developed. The intermediate lobe is, in general, not well developed in any species and is entirely absent in birds.
Defects in infundibulum development can result in a heart condition known as tetralogy of Fallot. A tendinous band extends upward from the right atrioventricular fibrous ring and connects the posterior surface of the infundibulum to the aorta. The infundibulum is the entrance from the right ventricle into the pulmonary artery and pulmonary trunk.
It has four described parts: the intramural part, isthmus, ampulla, and infundibulum with associated fimbriae. Each tube has two openings: a proximal opening nearest to the uterus, and a distal opening nearest to the ovary. The fallopian tubes are held in place by the mesosalpinx, a part of the broad ligament mesentery that wraps around the tubes.
The diaphragma sellae forms a central opening to accommodate the passage of the pituitary stalk (infundibulum) [1] which interconnects the pituitary gland and the hypothalamus. The diaphragma sellae is an important neurosurgical landmark. [1]