Memoirs: The Germinal Layers concerned in the Formation of the Alimentary Canal and Malpighian Tubules of Ephestia Kühniella (Lepidoptera)

1936 ◽  
Vol s2-78 (311) ◽  
pp. 533-542
Author(s):  
MABEL DRUMMOND
Keyword(s):  
Alimentary Canal ◽  
Malpighian Tubules ◽  
Germ Band ◽  
Gut Epithelium ◽  
Altered Form

1. The mid-gut epithelium of Ephestia is derived from cephalic and caudal mesendoderm rudiments which are proliferated from the germ-band independently of the stomodaeal and proctodaeal invaginations. 2. The oesophageal valve is formed by the backward growth from the blind end of the stomodaeum of six tubules, which later in a slightly altered form extend into the cavity of the mid-gut to form the valve of the larva. 3. The stomodaeum and proctodaeum are purely ectodermal. 4. The malpighian tubules are ectodermal.

Memoirs: The Embryonic Development of the Stick-Insect, Carausius morosus

1936 ◽  
Vol s2-78 (311) ◽  
pp. 487-511
Author(s):  
A. J. THOMAS
Keyword(s):  
Embryonic Development ◽  
Stick Insect ◽  
Malpighian Tubules ◽  
Germ Band ◽  
Ventral Plate ◽  
Carausius Morosus ◽  
Gut Epithelium ◽  
Cleavage Nucleus ◽  
Endodermal Cells ◽  
Late Stages

1. The maturation of the egg takes place in the ovarian tube, and is immediately followed by the formation of the cleavagenucleus and its division into many nuclei. 2. The entire products of the cleavage-nucleus migrate to the surface to form the blastoderm. Cleavage of the yolk was not observed even in late stages. Yolk-cells are absent when the blastoderm is being formed. 3. Primitive endodermal cells are proliferated from the middle of the germ-band, and form a membrane between the germ-band and the yolk. The membrane is present only in embryonic stages; some of the cells proliferated wander into the yolk and act as vitellophags. 4. Mesoderm is formed by proliferation of cells from the ventral plate. It is preceded by the formation of a shallow gastrular furrow, and from the bottom of this furrow proliferation takes place. The mesoderm becomes arranged in segmental masses. 5. Two masses of cells proliferated at the anterior and posterior ends of the germ-band are shown to be the endodermal rudiments from which the mid-gut epithelium is formed. The invaginations of the stomodaeum and proctodaeum grow against these masses and carry parts of the proliferating areas near their blind ends. It is shown that the various methods of mid-gut formation which have been described could be reconciled with the process described in Carausius. 6. The hinder end of the mid-gut is flanked by two plates of ectoderm which are forward extensions of the proctodaeum. Into these extensions the Malpighian tubules open, and, as their histology is identical with that of these extensions and widely different from that of the mid-gut, these tubules must be ectodermal in nature. 7. The formation of the amnion and serosa are described.

Memoirs: The Development of the Alimentary Canal in Pieris Brassicae and the Endodermal origin of the Malpighian Tubules of Insects

1932 ◽  
Vol s2-75 (298) ◽  
pp. 283-305
Author(s):  
H. HENSON
Keyword(s):  
Alimentary Canal ◽  
Common Duct ◽  
Primitive Streak ◽  
Pieris Brassicae ◽  
Malpighian Tubules ◽  
Germ Band ◽  
The Common ◽  
Hind Gut ◽  
Insect Gut ◽  
Endodermal Origin

1. The interstitial (imaginal) rings of the insect gut are interpreted as homologous with the lips of the embryonic mouth and anus of Peripatus (i.e. the blastopore lips). 2. The Malpighian tubules of Amphipod Crustacea, Lithobius, Stenopelmatus (Orthoptera), Hepialus (Lepidoptera), Calliphora (Diptera) are all appendages of the posterior end of the mid-gut and endodermal. 3. The Malpighian tubules of Pieris, although hind-gut appendages must be homologous with those of Hepialus. They are composed of three regions, (1) the functional parts of endodermal derivation, (2) the interstitial or imaginal ring which is probably derived from the posterior interstitial ring of the gut, (3) the common duct of proctodaeal origin. 4. The germ-band of the Lepidopterous embryo has a closed blastopore or primitive streak composed of two circular areas, anal and oral, connected by a median strand. The anal and oral blastoporic areas produce the anterior and posterior mesendoderm rudiments. 5. The development of the stomodaeum and proctodaeum shows that the following characteristics may be ascribed to the various parts of the gut.

The Symptoms and Histopathology of Poisoning by Maneb in Oncopeltus fasciatus (Dallas),

1965 ◽  
Vol 97 (11) ◽  
pp. 1200-1208 ◽  
Author(s):  
R. D. McMullen
Keyword(s):  
Oxygen Consumption ◽  
Malpighian Tubules ◽  
Oncopeltus Fasciatus ◽  
Secretory Cells ◽  
Cell Nuclei ◽  
Gut Epithelium

AbstractManeb (manganous ethylene bisdithiocarhamate) applied topically to Oncopeltus fasciatus nymphs causes death after 7 to 10 days. The gross symptoms of intoxication, histopathology and effect on oxygen consumption are described. Activities such as feeding and walking are slightly reduced after 24 hours and completely inhibited after 3 to 4 days. The tissues most severely affected by the treatment are the secretory cells of the mid-gut epithelium and the cells of the Malpighian tubules. These at first show extreme vacuolization, reduction of the size of cell nuclei and finally cytolysis. Oxygen consumption in vivo is reduced by the treatment.

scholarly journals Digestive And Tracheal System of Menopon Gallinae (Phthiraptera: Amblycera) Infesting Poultry Bird (Gallus Gallus Domesticus)

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Surman Arya ◽  
Suneel Kumar Singh
Keyword(s):  
Alimentary Canal ◽  
Gallus Domesticus ◽  
Malpighian Tubules ◽  
Gallus Gallus Domesticus ◽  
Tracheal System ◽  
Visceral Organs ◽  
Binocular Microscope ◽  
Hind Gut ◽  
Poultry Shaft Louse ◽  
Alary Muscles

The digestive and tracheal system of a poultry shaft louse, Menopon gallinae (Phthiraptera: Amblycera) has been studied in greater details. Alimentary canal of louse was dissected out along with crop under stereozoom binocular microscope. Entire alimentary canal of M. gallinae was found more or less straight and has three basic parts (fore-gut, mid-gut and hind-gut) while crop-teeth was present in the crop. The posterior end of crop contains 20-30 well developed crop-teeth arranged in a single arced plate, in comb-like fashion. Mid-gut was found as simple tube and contributes nearly one half of the total length, while the hind-gut was marked by the opening of Malpighian tubules in alimentary canal. The heart of M. gallinae is of simplest kind, one chambered bulbous structure having three pairs of laterally placed ostia and supported by four pairs of alary muscles. In the tracheal system there were seven pairs of spiracles occurred on the terga of M. gallinae. The first pair of spiracle was found located close to legs while remaining six abdominal spiracles occur from segment 3rd to 8th. The degree of tracheation of various visceral organs has also been noted.

Memoirs: The Alimentary Canal and Pro-epithelial Regeneration in Coccinella septempunctata with a comparison of Carnivorous and Herbivorous Coccinellids

1939 ◽  
Vol s2-81 (323) ◽  
pp. 451-478
Author(s):  
S. PRADHAN
Keyword(s):  
Alimentary Canal ◽  
Coccinella Septempunctata ◽  
The Other ◽  
Detailed Account ◽  
Nerve Supply ◽  
Epithelial Regeneration ◽  
Gut Epithelium

The paper incorporates: 1. The anatomy of the alimentary canal of Coccinella septempunctata as a type of carnivorous Coccinellid. 2. A detailed account of the extrinsic musculature and the nerve-supply of the cephallic stomodaeum, which have been studied in very few insects and never in Coccinellids. 3. The histology of the alimentary canal, specially the midgut, distinguishing four definite types of epithelium, one of which is surprisingly peculiar and has not been described before. This type of epithelium shows apparently two layers of cells, one superimposed over the other, the outer having large, regularly arranged, intercellular vacuoles as have not been described before, at least in the gut of insects. 4. A discussion on the relations of the four types of epithelium to one another, recognizing that this peculiar type of epithelium is just a phase in a unique process of Pro-epithelial Regeneration in the mid-gut epithelium. 5. A comparison of the chief characteristics of the alimentary canal of carnivorous and herbivorous Coccinellids based on the study of seven species of lady-bird beetles. 6. Probable explanations of the differences between the alimentary canals of the carnivorous and herbivorous Coccinellids.

Transport of Food Through the Alimentary Camals of Aquatic Annelids

1948 ◽  
Vol s3-89 (5) ◽  
pp. 47-51
Author(s):  
JEAN HANSON
Keyword(s):  
Alimentary Canal ◽  
Anterior Part ◽  
Gut Contents ◽  
Ciliated Epithelium ◽  
Gut Epithelium ◽  
The University ◽  
Anterior Direction ◽  
Metachronal Waves ◽  
Muscle Coat ◽  
Made In

1. In most serpulids and sabellids the only muscle coat in the wall of the alimentary canal lies outside the blood sinus which envelops it. In a few sabellids there is another muscle coat, of unknown function, between the sinus and the gut epithelium. 2. The muscles outside the sinus contract antiperistaltically and tend to hinder the transport of the gut contents towards the anus. 3. The contents of the alimentary canal are transported by its cilia which beat towards the anus. The metachronal waves of the ciliated epithelium travel in a postero-anterior direction. The ‘ascending ciliary current’ of Stephenson (1913) does not exist. 4. The food boli of serpulids and sabellids rotate as they move down the gut. In Salmacina incrustans the rotation is imparted by cilia in the anterior part of the gut. These observations were made in the Zoological Station of Naples. I wish to record my gratitude to the staff of the Station, to the British Association for the Advancement of Science for the use of its Table, and to the University of London for a grant towards travelling expenses.

On the gregarine Lankesteria culicis (Ross), 1898, from the mosquito Aëdes (Finlaya) geniculatus (Olivier)

Parasitology ◽  
1949 ◽  
Vol 39 (3-4) ◽  
pp. 291-294 ◽  
Author(s):  
P. N. Ganapati ◽  
P. Tate
Keyword(s):  
Life History ◽  
Alimentary Canal ◽  
Cyst Formation ◽  
Systematic Position ◽  
Malpighian Tubules ◽  
Adult Mosquito ◽  
History Of ◽  
Hind Gut

1. The morphology and life history of a gregarine Lankesteria culicis (Ross), as it lives in the gut of Aëdes (Finlaya) geniculatus (Olivier), are described. The earlier stages are intra-epithelial in the fore and anterior mid-gut of the larvae. After a period of growth the trophozoites are liberated into the gut lumen where they attach themselves to the epithelium by a well-developed epimerite which functions as a sucker. Cyst formation and further stages in sporogony take place in the malpighian tubules when the larvae develop into the pupae. In the adult mosquito only ripe sporocysts are found, packed in the malpighian tubules and scattered in the hind-gut. The spores escape through the alimentary canal.2. The systematic position of Lankesteria is reviewed. In view of its true dicystid nature, combining both acephaline and cephaline features, it is suggested that its proper systematic position would be in the dicystid family Lecudinidae Kamm emend. Reichenow, 1929, which includes all forms intermediate in position between the monocystids and the true tricystids.

A role for CdxA in gut closure and intestinal epithelia differentiation

Development ◽  
1994 ◽  
Vol 120 (2) ◽  
pp. 253-263 ◽  
Author(s):  
A. Frumkin ◽  
G. Pillemer ◽  
R. Haffner ◽  
N. Tarcic ◽  
Y. Gruenbaum ◽  
...  
Keyword(s):  
Protein Expression ◽  
Intestinal Epithelium ◽  
Alimentary Canal ◽  
Gradual Increase ◽  
Homeobox Gene ◽  
Early Embryogenesis ◽  
Main Site ◽  
Intestinal Epithelia ◽  
Gut Epithelium ◽  
Tight Linkage

CdxA is a homeobox gene of the caudal type that was previously shown to be expressed in the endoderm-derived gut epithelium during early embryogenesis. Expression of the CDXA protein was studied during intestine morphogenesis from stage 11 (13 somites) to adulthood in the chicken. The CDXA protein can be detected during all stages of gut closure, from stage 11 to 5 days of incubation, and is mainly localized to the intestinal portals, the region where the splanchnopleure is undergoing closure. In this region, which represents the transition between the open and closed gut, the CDXA protein is restricted to the endoderm-derived epithelium. At about day 5 of incubation, the process of formation of the previllous ridges begins, which marks the beginning of the morphogenesis of the villi. From this stage to day 11 expression of CDXA is localized to the epithelial lining of the intestine. In parallel, a gradual increase in CDXA protein expression begins in the mesenchyme that is close in proximity to the CDXA-positive endoderm. Maximal CDXA levels in the mesenchyme are observed at day 9 of incubation. During days 10 and 11 CDXA levels in the mesenchyme remain constant, and by day 12 CDXA becomes undetectable in these cells and the epithelium again becomes the main site of expression. From day 12 of incubation until adulthood the CDXA protein is present in the intestinal epithelium. Until day 18 of incubation expression can be detected along the whole length of the villus with a stronger signal at the tip. With hatching the distribution along the villi changes so that the main site of CDXA protein expression is at the base of the villi and in the crypts. The transient expression of CDXA in the mesenchyme between days 5 and 11 may be related to the interactions taking place between the mesenchyme and the epithelium that ultimately result in the axial specification of the alimentary canal and the differentiation of its various epithelia. The main CDXA spatial distribution during morphogenesis suggests a tight linkage to the formation and differentiation of the intestinal epithelium itself. CDXA appears to play a role in the morphogenetic events leading to closure of the alimentary canal. During previllous ridge formation the CDXA protein is transiently expressed in the mesenchymal cells thought to provide instructive interactions for the regionalization and differentiation of the gut epithelium.(ABSTRACT TRUNCATED AT 400 WORDS)

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