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The larynx is an irregular tubular dilatation of the respiratory tract proper which connects the pharynx with the trachea and transmits air to the actual respiratory passages.
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The stomach is a sac-like dilatation of the digestive tube intervening between the oesophagus and the intestine.
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There may be recognized in the nose a base, which is directed downward, and a root, situated between the two orbits; the rounded anterior surface is directed forward and upward and is termed the dorsum, and it terminates in the tip of the nose, or apex nasi. The margins representing the lower borders of the base pass backward from the tip to form the alee, and they constitute the lateral boundaries of the nostrils (nares), which are separated from each other by the antero-inferior portion of the nasal septum, the membranous septum.
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The vagina is a rather capacious and markedly dilatable musculo-mucous canal, which extends from the uterus to the external genitalia. When collapsed it is markedly flattened from before backward, so that its lumen corresponds to the letter H, the anterior and posterior walls being in contact, while small recesses occur on either side. The anterior wall is usually concave posteriorly, the posterior wall being correspondingly convex anteriorly.
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All around the oral opening eleven muscles are laid out: one initially, of annular form, the labial or orbicular one of the lips, which governs its occlusion then a series of ten others which from the various areas of the face, come to fit on its circumference like so many convergent rays. They are, from top to bottom: the common elevator of the wing of the nose and the upper lip; the very elevator of the upper lip; the canine one; the minor zygomatic muscle; the big zygomatic; the buccinator; the risorius; the triangular one of the lips; the square of the chin; the muscle of the bunch of the chin.
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