. A textbook in general zoology. Zoology. 212 FISHES The gullet opens into the stomach, which consists of an anterior region that extends straight back and ends blindly; a posterior region that leaves the anterior region at right angles near its middle; and three long, cylindrical, blind sacs, the caeca (Fig. 148). The intestine begins just back of the C£eca and after one or two turns terminates at the anal opening. The liver lies in the anterior end of the body cavity and has on its posterior surface a gall bladder which empties its bile through a short duct into the anterior part of the inte
. A textbook in general zoology. Zoology. 212 FISHES The gullet opens into the stomach, which consists of an anterior region that extends straight back and ends blindly; a posterior region that leaves the anterior region at right angles near its middle; and three long, cylindrical, blind sacs, the caeca (Fig. 148). The intestine begins just back of the C£eca and after one or two turns terminates at the anal opening. The liver lies in the anterior end of the body cavity and has on its posterior surface a gall bladder which empties its bile through a short duct into the anterior part of the intestine. Circulatory system. — The heart of the perch lies between the gills and is in close relation to them. It is inclosed in. Eff^erdgiU arteries WepctMc art^y^ CmdalarleTy CauddLveln 'idneif Tf„i,rF 1' — ~. \ 'Mvm&ntarj/canal neoTv UepaUcvem t,iver ' Fig. 149.—• Circulation of a fish. the pericardi?! cavity which is entirely separate from the main body cavity. The heart consists of three parts, the sinus venosus, the thin-walled auricle, and the muscular ventricle, placed in the order named, beginning at the posterior end. The ventricle pumps the blood from its anterior end through a large artery that sends a branch to the lower end of each gill. The blood then flows upward through the gill filaments and leaves them from the dorsal ends through arteries that finally meet in the median plane on the dorsal side of the body cavity and form the dorsal. 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 Herrick, Glenn W. (Glenn Washington), 1870-1965. New York, Cincinnati [etc. ] American Book Company
Size: 2915px × 857px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
