Word Finder - abdomen

definition

The fat surrounding the belly.

definition

The belly, or that part of the body between the thorax and the pelvis, not including the back; or in some lower vertebrates, the portion between the cardiac and caudal regions.

synonyms

• belly
• stomach
• tummy

definition

The cavity of the belly, which is lined by the peritoneum, and contains the viscera; often restricted in humans to the part between the diaphragm and the commencement of the pelvis, the remainder being called the pelvic cavity.

example

He was all bent over complaining of pains in the abdomen.

definition

The posterior section of the body, behind the thorax, in insects, crustaceans, and other Arthropoda.

The abdomen under the wings of the butterfly still represents the larva.

From the right side of his abdomen, blood was welling out making a large stain on the grass.

He was taller than average, over six and a half feet, built like a rock with wide shoulders and tapered abdomen and hips beneath a jumpsuit similar to those worn by the prisoners.

In most respects, the shortened abdomen, for example, they are more specialized than the Thysanura, and most of the features in which they appear to be simple, such as the absence of a tracheal system and of compound eyes, can be explained as the result of degradation.

Verhoeff (1894-1896) - in a beetle's abdomen, but the tenth sternite is usually absent.

Other Hydrophilidae carry their egg-cocoons about with them beneath the abdomen.

A true insect, or member of the class Hexapoda, may be known by the grouping of its body-segments in three distinct regions - a head, a thorax and an abdomen - each of which consists of a definite number of segments.

A machine warms the fluid and delivers it to your child's abdomen through the tube.

Moreover, in this order the abdomen shows at first a division into only nine segments and a terminal mass, which last subsequently becomes divided into two.

In the embryos of many insects there are projections from the segments of the abdomen similar, to a considerable extent, to the rudimentary thoracic legs.

The pseudopods that exist on the abdomen of numerous caterpillars may possibly arise from the embryonic pseudopods, but this also is far from being established.

Nephridia in two series; large, anterior nephridia followed by small, short tubes in abdomen.

The male, however, is a veritable pigmy beside the female, and during copulation presents the appearance of a parasite attached to her abdomen.

Look out for their black and white striped abdomen and orange patches on the wing.

Feel a warmth in your upper abdomen; breathe; focus.

A CT scan of the abdomen showed both adrenals were enlarged and contained specks of calcium (3C, arrows ).

The abdomen is composed of varying numbers of segments; it bears no legs but may possess appendages, e.g. claspers used in mating.

Many of the Hydrophilidae construct, for the protection of their eggs, a cocoon formed of a silky material derived from glands opening at the tip of the abdomen.

A thorax also is sometimes to be distinguished from an abdomen.

Respiration is effected by means of external gills placed along both sides of the dorsum of the abdomen and hinder segments of the thorax.

Using ultrasound to guide the way, a needle is inserted through the mother's abdomen into the developing placenta.

The nurses held the torches over the patient's abdomen in shifts to prevent their arms becoming stiff.

Breeding is usually in the autumn; the eggs become attached to the underside of the female's abdomen.

Perhaps the most shocking sight is a prosthetic woman's abdomen, cut open in a cesarean section.

Females have a yellow abdomen with two prominent longitudinal black bands on the upper surface.

On opening the abdomen a small initial peritoneal incision is made.

Reverse Abdominal Nose Panting expands the abdomen on the puff out.

This is indicated by the way the swollen abdomen tapers down to a distinct point.

In these forms the bundles of setae are either capilliform or uncinate, and the dorsal setae of the thorax are like the ventral setae of the abdomen.

He finds that the endoderm arises may be readily distinguished, six of which subsequently enter into from an anterior and a posterior rudiment derived from the " endothe formation of the head, three going to the thorax and twelve to blast," that many of the cells of these rudiments wander into the the abdomen.

The specialization of form in the constricted abdomen and in the suctorial " tongue " that characterizes the higher families of the order is correlated with the habit of careful egg-laying and provision of food for the young.

Apart from these characteristics, the most distinctive feature of earwigs is the presence at the end of the abdomen of a pair of pincers which are in reality modified appendages, known as cercopods, and represent the similar limbs of Japyx and the caudal feelers of Campodea and some other insects.

The eggs, which are 16 in number, are deposited in a leathery capsule fixed by a gum-like substance to the abdomen of the female, and thus carried about till the young are ready to escape, when the capsule becomes softened by the emission of a fluid substance.

The coloration of tsetse-flies is sombre and inconspicuous; the brownish or greyish-brown thorax usually exhibits darker longitudinal markings, and when the insect is at rest the abdomen or hinder half of the body is entirely concealed by the brownish wings.

In some species the abdomen is of a paler colour and marked with sharply defined, dark brown bands, which are interrupted on the middle line.

The tip of the proboscis is armed with a complicated series of chitinous teeth and rasps, by means of which the fly is enabled to pierce the skin of its victim; as usual in Diptera the organ is closed on the upper side by the labrum, or upper lip, and contains the hypopharynx or common outlet of the paired salivary glands, which are situated in the abdomen.

The blood-sucking habit is common to both sexes, and the abdomen, being capable of great expansion, is adapted for the periodical ingestion of an abundant food-supply.

The act of feeding, in which the proboscis is buried in the skin of the victim nearly up to the bulb, is remarkably quick, and in thirty seconds or less the abdomen of the fly, previously flat, becomes swollen out with blood like a berry.

With very few exceptions, the integuments form imbricate scalelike folds arranged with the greatest regularity; they are small and pluriserial on the upper parts of the body and tail, large and uniserial on the abdomen, and generally biserial on the lower side of the tail.

Opening their jaws to their fullest extent, they seize the animal generally by the head, and pushing alternately the right and left sides of the jaws forward, they press the body through their elastic gullet into the stomach, its outlines being visible for some time through the distended walls of the abdomen.

In the latter case the larva crawls about the bottom of the water or up the stems of plants, with its thickly-chitinized head and legs protruding from the larger orifice, while it maintains a secure hold of the silk lining of the tube by means of a pair of strong hooks at the posterior end of its soft defenceless abdomen.

The constriction of this segment and its very perfect articulation with the propodeum give great mobility to the abdomen, so that the ovipositor or sting can be used with the greatest possible accuracy and effect.

But the most natural division is obtained by the separation of the saw-flies as a primitive sub-order, characterized by the imperfect union of the first abdominal segment with the thorax, and by the broad base of the abdomen, so that there is no median constriction or " waist," and by the presence of thoracic legs - usually also of abdominal pro-legs - in the larva.

This sub-order, characterized by the " sessile," broad-based abdomen, whose fist segment is imperfectly united with the thorax, and by the usually caterpillar-like larvae with legs, includes the various groups of saw-flies.

In this division the ovipositor issues from the ventral surface of the abdomen; the pronotum reaches back to the tegulae;.

The four succeeding sections, in which the ovipositor is modified into a sting (always exserted from the tip of the abdomen) and the trochanters are with few exceptions simple, form the Aculeata of Linnaeus.

This section includes a number of families characterized by the backward extension of the prothorax to the tegulae and distinguished from the ants by the absence of " nodes " at the base of the abdomen.

In the adult there is a pair of such glands opening ventrally on the hindmost thoracic segment, or at the base of the abdomen; but in the young insect the glands are situated dorsally and open to the exterior on a variable number of the abdominal terga.

The Pentatomidae (shield bugs), some of which are metallic or otherwise brightly coloured, are easily recognized by the great development of the scutellum, which reaches at least half-way back towards the tip of the abdomen, and in some genera covers the whole of the hind body, and also the wings when these are closed.

About twenty-seven species are now known, all characterized by length not excee 4 ding 06 of an inch, flat wings, three articulations in the antennae, one or two articulations in the tarses, with digitules, but without cornicles on the abdomen.