ANUS
\ˈe͡ɪnʌs], \ˈeɪnʌs], \ˈeɪ_n_ʌ_s]\
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By J.H. Kenneth
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The circular opening situate at the inferior extremity of the rectum, by which the excrement is expelled. The fundament. The body. The seat, (F.) Siege, Fondement. Anus also signifies the anterior orifice of the Aqueduct of Sylvius. By some, this Anus, called, also, Foramen commune posterius, has been supposed to form a communication between the back part of the third ventricle and the lateral ventricles. It is closed up, however, by the tela choroidea, and also by the fornix, which is intimately connected with this. The foramen is situate between the commissura mollis of the optic thalami and the pineal gland.
By Robley Dunglison
By Willam Alexander Newman Dorland
Word of the day
nerve fiber
- a threadlike extension of nerve cell Slender processes of neurons, especially the prolonged axons that conduct nerve impulses. One units trunk; it is axis process a neuron and medullated, i. e. white substance Schwann (myelin), medullated; either the medullated non-axis-cylinder or may not be surrounded by primitive sheath neurilemma, so that there are four forms of nerve-fibers.