Scarcity of items despite the available technology for production or the sufficient capacity for sharing.

(anatomy) The inner branch of the carotid artery that supplies the brain, eyes, and other internal structures of the head.

(trigonometry) The area hyperbolic tangent function, i.e., the inverse hyperbolic tangent function.

(anatomy) A branch of the first portion of the maxillary artery that is the largest artery supplying the dura mater, enters the cranium through the foramen spinosum, and divides into anterior and posterior branches in a groove in the greater wing of the sphenoid bone.

(anatomy) Any of the arteries supplying the cerebral cortex.

(anatomy) An artery that arises from the internal carotid artery, forms the anterior portion of the circle of Willis where it is linked to the artery on the opposite side by the anterior communicating artery, and passes on to supply the medial surfaces of the cerebrum.

(anatomy) One of the three arteries in the brain that form parts of the circle of Willis; it connects the anterior cerebral arteries.

(anatomy) An artery supplying the deep structures of the face (as the nasal cavities, palate, tonsils, and pharynx) and sending a branch to the meninges of the brain.

(anatomy) An artery that arises by the terminal forking of the basilar artery where it forms the posterior portion of the circle of Willis and passes on to supply the lower surfaces of the temporal and occipital lobes.

(anatomy) An artery that arises from the internal carotid artery, passes along the lateral fissure, and supplies the lateral surfaces of the cerebral cortex.