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1. a slight indentation or depression, as one produced in the surface of one organ by pressure exerted by another.
2. a negative imprint of an object made in some plastic material that later solidifies.
3. an effect produced upon the mind, body, or senses by some external stimulus or agent.
an invagination of the base of the skull into the posterior fossa with compression of the brainstem and cerebellar structures into the foramen magnum. Compare: platybasia.
bas·i·lar im·pres·sion(basi-lăr impreshŭn)
Invagination of the base of the skull into the posterior fossa with compression of brainstem and cerebellar structures into the foramen magnum.
pertaining to a base or basal part.
one of the main blood supplies to the brain. It originates from the junction of the two vertebral arteries, runs in a median groove, beneath the medulla and pons, and terminates rostrally at the cerebral circle (of Willis). See also Table 9.
at the base of the skull, usually involving the occipital and basisphenoid bones.