hind-gut

Ileo-colon: the anterior portion of the hind-gut, extending from the mid-gut to the rectum, when not distinctly differentiated into ileum and colon.

Explanation of Terms Used in Entomology John. B. Smith

The anterior end of the fore-gut is separated from the stomodeum by the buccopharyngeal membrane (Fig. 977); the hind-gut ends in the cloaca, which is closed by the cloacal membrane.

XI. Splanchnology. 2. The Digestive Apparatus 1918

—The primitive digestive tube consists of two parts, viz.: (1) the fore-gut, within the cephalic flexure, and dorsal to the heart; and (2) the hind-gut, within the caudal flexure (Fig. 977).

XI. Splanchnology. 2. The Digestive Apparatus 1918

Between the fore-gut and the hind-gut there exists for a time a wide opening into the yolk-sac, but the latter is gradually reduced to a small pear-shaped sac (sometimes termed the umbilical vesicle), and the channel of communication is at the same time narrowed and elongated to form a tube called the vitelline duct.

I. Embryology. 9. Separation of the Embryo 1918

This bend becomes dilated into a pouch, which constitutes the entodermal cloaca; into its dorsal part the hind-gut opens, and from its ventral part the allantois passes forward.

XI. Splanchnology. 2. The Digestive Apparatus 1918

This invagination is termed the proctodeum, and it meets with the entoderm of the hind-gut and forms with it the anal membrane.

XI. Splanchnology. 2. The Digestive Apparatus 1918

Here it exists merely as a narrow, tubular diverticulum of the hind-gut, and never assumes the form of a vesicle outside the embryo.

I. Embryology. 11. Development of the Fetal Membranes and Placenta 1918

—The hind-gut is at first prolonged backward into the body-stalk as the tube of the allantois; but, with the growth and flexure of the tail-end of the embryo, the body-stalk, with its contained allantoic tube, is carried forward to the ventral aspect of the body, and consequently a bend is formed at the junction of the hind-gut and allantois.

XI. Splanchnology. 2. The Digestive Apparatus 1918

—The allantois arises as a tubular diverticulum of the posterior part of the yolk-sac; when the hind-gut is developed the allantois is carried backward with it and then opens into the cloaca or terminal part of the hind-gut: it grows out into the body-stalk, a mass of mesoderm which lies below and around the tail end of the embryo.

I. Embryology. 11. Development of the Fetal Membranes and Placenta 1918

A small part of the hind-gut projects backward beyond the anal membrane; it is named the post-anal gut (Fig. 991), and usually becomes obliterated and disappears.

XI. Splanchnology. 2. The Digestive Apparatus 1918