. The anatomy of the common squid : Loligo pealii, Lesueur. Loligo pealii; Mollusks -- Anatomy. 41 and in front of tlie lieart which lies between the nephridium and the pancreas. The rectum lies just beneath the skin of the lower surface of the visceral mass. Its upper surface is next to the ventral part of the nephridium and to the ink sac which separates it from the anteiior vena cava. The rectum is about half as long as the liver and it extends from the level of the hinder end of the liver to the middle of the same. The forward end of the rectum is attached to the liver case by a mesen- ter
. The anatomy of the common squid : Loligo pealii, Lesueur. Loligo pealii; Mollusks -- Anatomy. 41 and in front of tlie lieart which lies between the nephridium and the pancreas. The rectum lies just beneath the skin of the lower surface of the visceral mass. Its upper surface is next to the ventral part of the nephridium and to the ink sac which separates it from the anteiior vena cava. The rectum is about half as long as the liver and it extends from the level of the hinder end of the liver to the middle of the same. The forward end of the rectum is attached to the liver case by a mesen- tery-like fold of skin. It ends in a small anal chamber from which it is separated by an anal sphincter. The ink sac opens into the anal chamber and the cham- ber opens into the mantle cavity through the transversely oval anus which is bounded by an upper and a lower lip. A pair of ovate leaf-like processes, the rectal valves, sup- ported on short round stalks are attached at each side of the anus. The wall of the intestine and rectum has the usual circular and longitudinal muscles and, with the exception of the distal part of the rectum, is lined by a ciliated columnar epithelium in which are scattered go-. FV Fig. 13. blet cells. The epithelium of the middle of the rectum is non-ciliated and contains a large number of goblet cells while that of the ventral end is palisadal, non- ciliated, and contains a large number of characteristic cells (Text figure 18). Each of these cells has a single process from one to four times as long as the cell and one half or less the breadth of the cell. The majority of the processes are blunt, but some of them taper out into fine points while a few are knobbed or contain a vacuole in the free end. The processes vaiy in size from mere. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original wo
Size: 1388px × 1799px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookauthoramericanmuseumofnaturalhistory, bookyear1910
