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71alimentary canal — Anat., Zool. a tubular passage functioning in the digestion and absorption of food and the elimination of food residue, beginning at the mouth and terminating at the anus. [1755 65] * * * or digestive tract Pathway along which food travels when… …
72amniotic fluid — Anat., Zool. the watery fluid in the amnion, in which the embryo is suspended. * * * …
73annular ligament — Anat. the ligamentous envelope surrounding a part, as the joints of the wrist or ankle or the head of the radius. [1835 45] * * * …
74anterior pituitary — Anat. See under pituitary gland. * * * …
75aortic valve — Anat. a semilunar valve between the aorta and the left ventricle of the heart that prevents the blood from flowing back into the left ventricle. * * * …
76aqueous humor — Anat. the limpid watery fluid that fills the space between the cornea and the crystalline lens in the eye. [1635 45] * * * …
77association fiber — Anat. any of several nerve fibers connecting different areas of the cerebral cortex in the same hemisphere. [1875 80] * * * …
78atrioventricular bundle — Anat. a bundle of specialized muscle fibers regulating the heartbeat by conducting impulses from the right atrium to the ventricles. Also called bundle of His. * * * …
79atrioventricular node — Anat. a small mass of muscular fibers at the base of the wall between the atria, conducting impulses received from the sinoatrial node by way of the atrioventricular bundles and, under certain conditions, functioning for the sinoatrial node as… …
80auditory canal — Anat. the narrow passageway from the outer ear to the eardrum. [1895 1900] * * * …
