Archive image from page 59 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9885 Year: 1890 ( 46 THE LARVA OF THE BLOW-FLY. The dilator muscles of the gullet are inserted into the middle of the lower wall of the pharyngeal sinus, the epipharynx, and by their contraction dilate the alimentary tube, so that the food is sucked into it. When th
Archive image from page 59 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9885 Year: 1890 ( 46 THE LARVA OF THE BLOW-FLY. The dilator muscles of the gullet are inserted into the middle of the lower wall of the pharyngeal sinus, the epipharynx, and by their contraction dilate the alimentary tube, so that the food is sucked into it. When they relax it is depressed on the h3popharynx by its elasticity, like the plunger of a pump; by this means the food is driven into the crop. As there are no valves to the pharyngeal apparatus, I suspect the plunger itself acts as a valve, its anterior portion rising and descending before the posterior portion, so that the food is swallowed by a Fig. 10.—A vertical and horizonlal diagiammatic section of the larva, to show the relative position of the internal organs and the segments. The segments are numbered on the supposition that the three cephalic post-oral somites exist, as, anterior spiracle ; //;, pharynx ; id, imaginal discs ; 'mJ, wing disc ; m, nerve centre ; <r, crop ; pv, proventriculus ; ch, chyle stomach ; i, hxmal curve of the intestine ; .t;'-, salivary gland ; </v, dorsal vessel ; mhv, Malpighian vessels ; ps, posterior spiracle ; ;-, rectum. The lower figure shows the general arrangement of the larger trachea. kind of peristaltic act. The action of this organ is exactly similar to that of the fulcrum (pharynx) of the imago. The suctorial action of the pharynx of the larva of OEstrus was first pointed out by Scheiber [21]. The upper and back part of the pharyngeal sinus of the young larva lodges the antennal disc sac. In the adult larva this is placed behind the cephalo- pharynx, but it sends a pair of processes into the pharyngeal sinus, between the co
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Keywords: 1890, archive, blowflies, book, bookauthor, bookdecade, bookpublisher, booksubject, bookyear, drawing, historical, history, illustration, image, london_pub_for_the_author_by_r_h_porter, lowne_benjamin_thompson_1839_, page, picture, print, reference, vintage
