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81auditory nerve — Anat. either one of the eighth pair of cranial nerves, consisting of sensory fibers that conduct impulses from the organs of hearing and from the semicircular canals to the brain. Also called acoustic nerve. [1715 25] * * * …
82axial skeleton — Anat. the skeleton of the head and trunk. [1870 75] * * * …
83basal disk — Anat. the flattened basal surface by which coelenterate polyps attach to the substrate. Also called pedal disk. * * * …
84basal ganglion — Anat. any of several masses of gray matter in each cerebral hemisphere. [1910 15] * * * …
85basilar membrane — Anat. a supporting membrane, esp. the membrane that supports the organ of Corti in the ear and aids in translating sound vibrations into electrical signals. [1865 70] * * * …
86basilic vein — Anat. a large vein on the inner side of the arm. [1660 70; < L vena basilica royal vein] * * * …
87bile duct — Anat. a large duct that transports bile from the liver to the duodenum, having in humans and many other vertebrates a side branch to a gallbladder for bile storage. [1765 75] * * * …
88bony labyrinth — Anat. See under labyrinth (def. 6a). * * * …
89brachial plexus — Anat. a network of nerves in the armpits and neck, innervating the shoulders, arms, and hands. [1855 60] * * * …
90brachiocephalic vein — Anat. either of two major veins, formed by the merger of the subclavian and internal jugular veins, that drain blood from the head and arms. [1850 55] * * * …
