. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. STOMACH AND INTESTINE. 321 Their diameter is about ^irg-th of an inch, but is also increased towards the pylorus. Tims their length has to their breadth a pro-. Stomach-tube from the middle of the human stomach. Magnified \40 diameters. a, wall of the tube, lined with large oval nu- cleated cells; b, the same oval cells isolated, and magnified 800 diameters; c, nucleated cells of co- lumnar epithelium, occupying the upper parts of the tubes, and the intervening ridges; d, blind ex- tremity of the tube. portion of about 1
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. STOMACH AND INTESTINE. 321 Their diameter is about ^irg-th of an inch, but is also increased towards the pylorus. Tims their length has to their breadth a pro-. Stomach-tube from the middle of the human stomach. Magnified \40 diameters. a, wall of the tube, lined with large oval nu- cleated cells; b, the same oval cells isolated, and magnified 800 diameters; c, nucleated cells of co- lumnar epithelium, occupying the upper parts of the tubes, and the intervening ridges; d, blind ex- tremity of the tube. portion of about 10 to 1. Their form fre- quently so far deviates from that of a simple cylinder as to present slight constrictions or undulations. And occasionally they even exhibit a kind of caecal pouch or blind offset of greater or less length. These pouches usually spring from the lower extremities of the tubes, which generally have a somewhat increased diameter in their neighbourhood.* But with these exceptions, the gastric tubes form simple, straight cylinders, which only widen where they open on the inner surface or cavity of the * These appearances are generally more marked in the separated fragments of a specimen, or on its exposed edges and surfaces, and are certainly often absent. From this and other reasons I have long entertained the suspicion that they are chiefly due to mechanical violence. •)• A widening of diameter which obviously cannot exceed the thickness of the matrix around each tube, and may therefore be easily estimated from the amount of this latter tissue seen in looking at any vertical section of the mucous membrane in sitft. Sujtj). The limitary or basement membraite which forms these tubes precisely resembles this delicate homogeneous layer of the mucous structures generally, except perhaps in the fact of its possessing an even greater tenuity. It is usually seen only as a dark outline, bounding some part of a tube that happens to have been isolated
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