The buccal mass and oesophagus arise from a stomodaeal invagination, and the anus is formed later from a short proctodaeal invagination.
An ink-sac formed as a diverticulum of the rectum and opening near the anus is present in all Dibranchiata (fig.
Dibranchiata), and a single pair of renal organs, opening by apertures right and left of the median anus (fig.
There can be no doubt that the mouth and anus of this embryo become the mouth and anus of the adult.
Distance from embryonic mouth to hind end of embryonic anus .
In front of this point it rapidly dilates again, and, after becoming fairly wide, opens on the dorsal side of the cloacal section of the alimentary canal just behind the anus (fig.
The important question as to the connection between the adult mouth and anus, and the embryonic mouth and anus of the Stage E, must, considering the great gap between Stage E and the next oldest embryo, be left open.
The embryonic mouth and anus are derived from the respective ends of the original blastopore, the middle part of the blastopore closing up.
This cloaca communicates at one end with the general cloaca by a single aperture situated at the point of a somewhat conspicuous papilla, just behind the anus (Pl.
Distance from hind end of embryonic anus to hind end of body .
Length between hind end of embryonic mouth and front end of embryonic anus .
Distance from front end of embryonic mouth to hind end of embryonic anus .
The very late appearance of the anus may be noticed as a point in which Elasmobranchii agree with other Vertebrata, notably the Fowl[306].
The remains of the original blastopore are present as the mouth, placed between the second pair of mesoblastic somites, and the anus placed on the concavity of the commencing flexure of the hind part of the body.
Meanwhile, we may point out that the embryonic mouth of Stage E has exactly the same position as that of the adult; but that the anus is considerably in front of the hind end of the body in Stage E, while it is terminal in the adult.
We think it probable that the larval anus eventually shifts to the hind end of the body, and gives rise to the adult anus.
It extends forwards from the anus for about three-fifths of the length of the body-cavity, and in our example had a total length of about 28 centims.
Only in the monotremes do the anus and the genito-urinary tract open into a common cloaca surrounded by a sphincter common to the anal and genito-urinary openings (sphincter cloacae).
The anus is, therefore, independent of the end-gut in its development.
Then he opened his anus again, and let out all the whales and the salmon and the other good fishes, both great and small, so that the whole house was full of them.
Then he did as Panaumbe had told him, and opened his anus as wide as possible towards the sea.
Then he opened his anus again, and let out all the whales and salmon, and the other good fishes, both great and small, so that the whole house was full of them.
When his inside was quite full, he closed his anus and ran home.
In some even the vulva andanus become one foramen, having the same course.
After this the tear between the anus and vulva we sew in three or four places with silk thread.
They described imperforate anus and how it was to be relieved by operation.
The penis smooth and round was made with anus best to match it, iii.
Tail of female simple, bluntly pointed; reproductive outlet close to the head; anus immediately above the tip of the tail.
Infection ordinarily takes place by the accidental and direct conveyance of the eggs that are lodged in the neighbourhood of the victim’s anus to the mouth.
Below the anus the papillæ are regularly arranged in pairs, seven in number, the two uppermost pairs being double.
Account of a Case in which a New and Peculiar Operation for Artificial Anus was performed in 1809.
Physick's Operation for Artificial Anus denied to have been performed.
In most cases the course of the alimentary canal from the distal end of the oesophagus to the cloaca or anus is longer than the corresponding region of the body, and the canal is therefore thrown into folds.
The modern epithet of rectum is the literal translation of his description of the straight progress (euthu) of the bowel to the anus (proktos.
The larva is curiously asymmetrical, as many as fourteen gill-clefts appearing in an unpaired series on the right side, while the mouth is a large orifice on the left side, the anus being median.
The keel of the ventral fin is continued past the anus into the expanded caudal fin, and so it happens that the anal opening is displaced from the middle line to the left side of the fin.
This family contains the single species Apororhynchus hemignathi, found near the anusof Hemignathiis procerus, a Sandwich Island bird.
The general features of this process and of the relation of the blastopore to mouth and anus have been explained in treating of the development of Mollusca generally.
The anus is antero-lateral, except in the Proctonotidae, in which it is median.
It is followed in some specialized Heteropoda and in the Euthyneura by a torsion in the opposite direction, or detorsion, which brings the anus farther back and untwists the visceral commissure (see Euthyneura, below).
Visceral sac very much reduced; without shell or mantle; anus posterior; foot provided with sucker in male only.
It should be to the right of the anus were this the case.
No shell; limaciform; terrestrial; female aperture on right side in middle of body; anus posterior.
Of the organs lying on the reflected mantle-skirt, that which in the natural state lay nearest to the vas deferens on the right side of the median line of the roof of the branchial chamber is the rectum i', ending in the anus a.
Finally, the original symmetry of the circumanal complex vanishes; the anus leaves the centre of the pallial cavity and passes towards the right side (left side in sinistral forms); the organs of this side become atrophied and disappear.
In such cases the blastopore may entirely close, and both mouth and anus develop as new ingrowths (stomodaeum and proctodaeum), whilst, according to the observations of N.
In development, the openings of the mantle-cavity and the anus are always originally posterior; later they are brought forward ventrally.
No lateral expansions, and no dorsal papillae; body planariform; anus dorsal, median and posterior.
At theanus it is fringed with long hairs, having the appearance, when in the water, of a funnel.
The white stripe above the anus is invariably present, and the transverse bars on the limbs are present in all specimens, although they are indistinct in some individuals.
All specimens have some white markings above theanus and on the posterodorsal surfaces of the thighs, but in some individuals the white flecks are expanded and interconnected forming an irregular white line.
The white stripe above the anus and the stripe from the snout along the side of the head are invariably present.
The red color on the limbs characteristic of infucata is lacking in pseudopuma, which also lacks the white stripe above the anus characteristic of infucata.
Sometimes even storks are fished up as if dead, having their beaks fixed in the anus of one another; many of these have been seen in the environs of Geneva, and even in the environs of Metz, in the year 1467.
A folded towel placed against the anus will assist the patient in resisting the desire to expel the water.
Allingham Recommends the introduction of a bony or ivory nipple-shaped plug into the anus before going to bed.
One or more of the small veins near the anus may rupture and cause a bloody (vascular) tumor beneath the mucous membrane or skin.
Fissure of the anus is a common local symptom of constipation.
The forcible method is generally done by inserting the two thumbs into the anus and stretching the muscle thoroughly in every direction until there is no resistance.
The most frequent cause of disease of the rectum is constipation and anyone of the following local diseases of the rectum and anus may be a symptom of constipation.
The buttocks and anus should be washed off with warm water after turpentine has been used in the enema.
Occasionally it becomes ulcerated from the irritation, infection takes place and an abscess forms around the margin of the anusterminating in a fistula.
Operations about the rectum and anuswith resulting discharge sometimes.
For inflamed piles, the following combinations may be used:-- Gum Camphor 1 dram Calomel 12 grains Vaselin 1 ounce Mix thoroughly and apply freely around the anus and in the rectum on the piles.
Disease may wear this muscle out and then the anus remains open, causing the contents of the bowel to move involuntary.
Underneath is the opening of the anus (an) and the urogenital sinus (S.
The formation of mouth and anus is secondary in all the vertebrates.
The two later apertures of the alimentary canal--the anus and the mouth--are secondary constructions, formed from the outer skin.
This membrane finally disappears, and henceforth the alimentary canal opens in front at the mouth and in the rear by the anus (Figures 1.
The horse's back will have an arched appearance, passing of gas from the anus frequently, the horse will make attempts to vomit.
With anal groove contouring anus behind, or groove faint or obsolete.
With anal grooves surrounding anus in front; inornate; without eyes; no posterior marginal festoons; venter of the male with non-salient plates.
A habit of fleas which we shall see is of significance in considering their agency in the spread of bubonic plague, is that of ejecting blood from the anus as they feed.
In front of the anus are seen two small muscles (transversae perinaei), G G, Fig.
In the normal form, the meatus urinarius and the anus coincide with the line of the median raphe, and signify omissions at stated intervals along the line of central union.
The anus is centrally situated in the depression formed between D D, the ischiatic tuberosities, and the double folds of the nates.
The transverse line B B, drawn in front of the anus from one tuber ischii to the other, is seen to divide the perinaeum into the anterior and posterior spaces, and to intersect at right angles the median line A A.
Between the back of the scrotum and the anus the perinaeum swells on both sides of the raphe, A B, Fig.
Nor, indeed, does the position of the anusaccord well with such a view.
The anus lies between the posterior pair of cirri, and deeply indents the last thoracic segment.
The anus opens on the dorsal surface of the thorax (fig.
I believe, is homologically terminal, and owes its dorsal aspect to the aborted state of the whole abdomen, and to the great development of the probosciformed penis; for the anus may be said to be situated on the dorsal base of this organ.
It is coated by circular, transverse muscular fibres: judging from the movements, the anus itself is surrounded by a strong sphincter muscle.
It is attended by heat, pressure, and pain between the anus and the root of the penis.
