. Class book of economic entomology [microform] : with special reference to the economic insects of the northern United States and Canada. Insect pests; Entomologie; Entomology; Insectes nuisibles, Lutte contre les; Insect pests; Insectes nuisibles. 36 ECONOMIC KNTOMOLOOY s\r. Fig. 30.—Dorsal view of ali- mentary eanal of the larva of the budmoth (Tmelocera ocellana). Ph., Pharynx: ()".. oesophagus; SM., suspensory muscles; vis- ceral trachea; of left side; MalpiKhian tubules; A/«.. mesen- teron; small intestine; In., intestinal nerve; R., rectum. directly into the stomach
. Class book of economic entomology [microform] : with special reference to the economic insects of the northern United States and Canada. Insect pests; Entomologie; Entomology; Insectes nuisibles, Lutte contre les; Insect pests; Insectes nuisibles. 36 ECONOMIC KNTOMOLOOY s\r. Fig. 30.—Dorsal view of ali- mentary eanal of the larva of the budmoth (Tmelocera ocellana). Ph., Pharynx: ()".. oesophagus; SM., suspensory muscles; vis- ceral trachea; of left side; MalpiKhian tubules; A/«.. mesen- teron; small intestine; In., intestinal nerve; R., rectum. directly into the stomach which is long. Further digestion occurs here through the action of secretions of the coeca/ lubes, often called the gastric ccera, which con- sist of glandular pouches emptying into the anterior end of the stomach. Most of the digested food is here absorbed and passes into the circulation. Pos- terior to the stomach is the which consists of three parts—ileum, colon, and reclum. Into the ileum open the Malpighian tubes which are excretory in function, similar to the kidneys of higher animals. The undigested portions of food are expelled through the recltm: and anus. Some variations may be noted. The oisophagus is long in those insects that suck their food, and short in herbivo- rous forms. In sucking insects the giz- zard may be absent, and the crop is often a side pocket of the oesophagus (Fig. 30). Structurally, the wall of the alimen- tary canal consists of: 1. An epitlielial layer of cells which secrete the intima or lining layer. 2. The delicate basement membrane. 3. Circular muscles. 4. Longitudinal muscles, which aid in constricting and enlarging the canal (Fig. 31). From an embryological point of view the alimentary tract consists of threi primary regions: 1. The Stomodceum, embracing thr fore part as far as the stomach. 2. The Mesenteron, or mid-inteslin • embracirig the stomach, and. Please note that these images are extracted from scanned page image
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectentomology, bookyear1
