There is no possibility that sperm and ova can escape by these tubes not in company with coelomic fluid.
Among the Oligochaeta the dorsal vessel in Dinodrilus and Megascolides is enclosed in a separate coelomic chamber which may or may not communicate with the main coelomic cavity.
Burger) in coelomic spaces close to nephridial funnels, which have, however, no relation to the gonad ducts.
These regions of the coelom end at the ends of the body and communicate with each other by means of a branched system of coelomic sinuses, which are in places very fine tubes.
Moreover, upon the intestine the coelomiccells are modified into chloragogen cells.
A further fact must be considered in deciding this question, which is the discovery of ramifying coelomic tubes, approaching close to, but not entering, the epidermis in the Polychaete Arenicola.
These break off and, lying in the coelomic fluid, break up into spermatozoa.
Quite independent of these are certain large dorsally situate funnel-like folds of the coelomic epithelium, ciliated, but of which no duct has been discovered leading to the exterior.
The nephridia, in fact, on this view, are ectodermic ingrowths, the coelomoducts coelomic outgrowths.
In favour of regarding the vascular system as totally absent, is the fact that the median coelomic channels contain no dorsal and ventral vessel.
The large sacs which have been termed vagina are suggestive of the large coelomic spermathecae in Eudrilids, a comparison which needs, however, embryological data, not at present forthcoming, for its justification.
The reproductive cells are modified coelomic cells, which lie on the ventral vessel.
Into the space between the walls of the coelom and the outer body-wall, originally filled with jelly, definite cells now wandered, chiefly derived from the coelomic walls.
The coelomic fluid contains as a rule both amoeboid and rounded corpuscles, and, when ripe, the products of the gonads.
We further suppose that of the four coelomic pouches one was in front of the mouth, one behind the anus, and one on each side.
They escape into thecoelomic fluid and there develop.
The genital products were derived from the lining of the coelomic cavities, but it would not be safe to say that any particular region was as yet specialized for generation.
Which of the coelomic cavities this last is connected with is uncertain, for there is considerable doubt as to the origin of the genital glands in the embryonic development of recent echinoderms.
The coelom is thus essentially and primarily (as first clearly formulated by Hatschek) the perigonadial cavity or gonocoel, and the lining cells of gonadial chambers are coelomic epithelium.
He terms the whole coelomic cavity the procoelom, which is divisible into a ventral unsegmented part, the body-cavity or metacoelom, and a dorsal segmented part, the somite.
The second coelomiccavity belongs to the segment of the fifth appendage.
In the table I have shown how the vertebrate coelomic cavities may be compared with those of Limulus.
In the vertebrate the segmentation in this region is indicated by the coelomic or head-cavities, which are cavities formed in the mesoderm of the embryo, the walls of which give origin to the striated muscles of the head.
The first part, then, of the mandibular cavity represents the third coelomic cavity in Limulus and the muscles derived from the ventral mesoderm, in all probability the muscles of the tongue in the lamprey (cf.
The segmental arrangement of the coelomic or head-cavities.
In Figure 3 the coelom is much cut up by the gill slits, and we have remaining of it (a) the dorsal coelomic canals (d.
Figure 2, Sheet 19), a pair of pigmented tubes opening into the atrium at the hind end of the pharynx, lying forward along by the dorsal coelomic canals, and having an internal opening also.
In 8 these buds have become hollow vesicles, growing out from it, the coelomic pouches.
The two prosthomeres are indicated by their coelomic cavities in the embryo (I and II, fig.
The third prosthomere is represented by a well-marked pair of coelomiccavities and the tritocerebrum (III, fig.
This segment is indicated embryologically by its paired coelomic cavities.
As in Crustacea and Arachnida, a first prosthomere is indicated by the paired eyes and the protocerebrum; the second prosthomere has a well-marked coelomic cavity, carries the antennae, and has the deuterocerebrum for its neuromere.
These sinuses are completely shut off from all other cavities, they do not open into the main coelomic space nor into the small arm-sinus, nor does the right sinus communicate with the left.
The posterior end of the intestine is similarly surrounded by a closed coelomic space known as the peri-anal sinus in which the rectum lies freely, unsupported by mesenteries.
Besides this main coelomic cavity there are certain other spaces which F.
The mantle-sinuses which form the chief spaces in the mantle are diverticula of the main coelomic cavity.
The portion of coelomic lining which gives rise to the male genital cells (testis) is in nearly, if not quite, all cases, shut off from the splanchnocoele.
The kidney of the adult fish is usually a compact gland extending over a considerable distance in an anteroposterior direction and lying immediately dorsal to the coelomic cavity.
The portion of coelomic lining which gives rise to the reproductive cells retains its primitive relations most nearly in the female, where, as a rule, the genital cells are still shed into the splanchnocoele.
The open ciliated funnel or nephrostome at the coelomic end of the tubule serves for the passage outwards of coelomic fluid to flush the cavity of the tubule.
In the great majority of Teleosts and in Lepidosteus the oviduct possesses no coelomic funnel, its walls being in structural continuity with the wall of the ovary.
At its anterior end is a wide funnel-like coelomic opening.
No doubt can be entertained that the greater part of the inner layer corresponds to the mesoderm of more ordinary embryos, for the coelomic pouches, the germ-cells, the musculature and the vascular system all arise from it.
The mass of cells undergoes segmentation corresponding with the outer segmentation of the embryo, and a pair of cavities--the coelomic pouches (fig.
A resemblance to the other Echinoderm larvae is found in the fact that coelomic diverticula of the enteron are present.
Cysts of a Coelomic Gregarine, in the body-cavity of a larva of Tipula.
The cuticle varies considerably in thickness, being well developed in active, intestinal forms, but very thin and delicate in non-motile coelomic forms (e.
This view is supported by the fact that certaincoelomic forms, like Diplodina and others, which either lack muscle-fibrils or else show no ectoplasmic differentiation at all, are non-motile.
The coelomic cavity appears as a symmetrical pair of spaces in the mesoderm, right and left of the intestine, and from it grow out the genital ducts and the renal organs.
The ovary forms a large projection into the genital coelom, and the coelomic epithelium is deeply invaginated into the mass of the gonad, so as to constitute an ovarian cavity communicating with the coelom by a narrow aperture.
This chamber is formed by thecoelomic or peritoneal wall; the space enclosed is originally part of the coelom, and in Sepia and Loligo is, in the adult, part of the viscero-pericardial chamber.
The siphuncle does not communicate with the coelomic cavity; it is a simple vascular process of the mantle, whose cavity consists of a venous sinus, and whose wall contains a ramification of the pallial artery.
Large lymphoid cells are early seen among those of the mesenchyme, but whether these migrate from the coelomic epithelium, or are originally mesenchymal is doubtful, though the former seems more probable.
These are the atrial coelomic funnels or brown funnels, so called on account of the characteristic pigmentation of their walls.
Although within the atrial cavity, it is separated from the latter by a narrow coelomic space, bounded towards the atrium by coelomic and atrial epithelium.
The ligamentum denticulatum is thus lined on one side by the epiblastic atrial epithelium, and on the other by mesoblastic coelomic epithelium.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "coelomic" in a variety of sentences. We hope that you will now be able to make sentences using this word.
