The vagina - anatomy of the vagina
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.
Muscles of the mouth or the lips
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.
The esophagus (Anatomy)
The esophagus is a muscular tube about 25 centimeters in length which is immediately continuous with the lower portion of the pharynx above and with the cardiac portion of the stomach below. It consists of three portions of the cervical, the thoracic, and the abdominal. The thoracic portion is by far the longest, while the abdominal is very short.
Anatomy of the liver
The liver is the largest gland of the human body.It has the shape of a flattened ellipsoid, passes almost transversely across the upper portion of the abdominal cavity, and is composed of two lobes, a much larger right lobe and a smaller left one. It is soft in consistence and has a peculiar brownish-red color.
Histology of the liver
That portion of the liver which is exposed in the abdominal cavity is covered by a reflection of the peritoneum, closely attached to the organ, because its deeper side is continuous with the fibrous structures or interstitial tissue of the liver itself. This serous covering is so thin that the substance of the liver can be readily seen through it.
At the portal fissure, the serous coat having been reflected from it, the liver is covered with a loose areolar tissue in which the main trunks of all but one of the vessels connected with it are situated: namely, the portal vein, hepatic artery, gall-duct, and lymphatics.
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