On the right side of the aperture was an elongated and rounded prominence similar in outline to a labium majus.
Hartung mentions a woman of thirty who while suckling had a mamma on the left labium majus.
Hofmokl also describes the case of a young girl with an undeveloped vagina, absence of the uterus and adnexa, who during a forcible and unsuccessful attempt at coitus, had her leftlabium majus torn from the vaginal wall.
The labium is much as in that of Perla, being broad and short, with a distinct median suture, indicating its former separation in embryonic life into a pair of appendages.
These are the movements which the animal executes after having first inserted the labium through a sweat-pore.
The maxillæ in the butterfly are united to form the sucking tube, while in the bee the end of the labium (Fig.
Figure 116 represents the mouth parts of the same insect a little farther advanced, with the jaws and labium elongated and closely folded together.
Thus massed into a single awl-like beak, the mosquito, without any apparent effort, thrusts them all except the labium into the flesh.
The labium is not developed from a pair of tubercles, as is usual, but at once appears as an unpaired, or single organ.
Under side of head of Diplax, with the labium or mask fully extended.
The labium in Japyx is four-lobed and bears a small two-jointed palpus.
The labium or second maxillæ, so large in the moth, serves simply as a spinneret in the caterpillar.
Defn: The front median plate of the labium in insects.
Defn: One of a pair of small appendages of the lingua or labium of certain insects.
Defn: That portion of the labium which bears the palpi in insects.
That portion of the labium which bears the palpi in insects.
The cyst forms a characteristic tense ovoid or pyriform swelling in the posterior third of the labium majus.
Their ducts open a little in front of the fossa navicularis, on each side of the vaginal orifice, in the groove between the attached border of the hymen and the labium minus.
When the flea is feeding, the epipharynx and mandibles are thrust into the skin of the victim, the labium serving as a guide.
As the sharp cutting organs are thrust deeper and deeper the labium doubles back like a bow and does not enter the skin.
The labium is divided close to its base so that it really consists of two slender four-segmented organs which lie close together and form a groove in which the piercing organs lie.
As they are thrust deeper and deeper the labium is bowed back to allow them to enter.
Lying in this groove along the upper side of the labiumare six very fine, sharp-pointed needles.
At the tip of the labium are the labellæ, two little lobes which serve to guide the piercing organs.
At the margin of the junction of the labium tympanicum with the basilar membrane the former is perforated for the passage of the nervous fibres, and this region is called the habenula perforata.
The labium vestibulare, so called from its position, is shorter than the labium tympanicum and is raised above into numerous blunt teeth.
The labium tympanicum is formed by the coalescence of the connective tissue layer separating the scala tympani from the cochlear canal with part of the connective tissue of the lamina spiralis.
The lamina spiralis is produced into two lips, called respectively the labium tympanicum and labium vestibulare; it is to the former and longer of these that the basilar membrane is attached.
The labium vestibulare is formed by a growth of the connective tissue which fuses with and passes up between the epithelial cells.
It will not be necessary to say much in reference to the development of the labium tympanicum and the labium vestibulare.
Partly springing out from the labium vestibulare, and passing from near the inner attachment of the membrane of Reissner towards the outer wall of the cochlea, is an elastic membrane, the membrana tectoria.
The extent of the medial edge of the papillae on the lower labium varies somewhat; in some, the papillae barely reach the level of the ends of the outer row of teeth, while in others they overlap the ends slightly.
The outer row of teeth of the lower labium is sometimes a little shorter or longer than the figure shows, but the average is about as indicated.
The tumour seldom bursts directly externally, but first gives way beneath the skin, producing extravasation, after which, in consequence of still farther distention, the labium itself ruptures.
Further, in the bugs, the labium is long and tubular, while the mandibles and maxillae are often modified into sharp, stiff bristles that work within the tube, the whole thus forming a combined piercing and sucking arrangement.
The labium bears a pair of similar palpi, which are, however, only three-segmented.
The palpi of both maxillae and labiumare wholly wanting in Hemiptera and the flexible needle-like maxillae and mandibles are enclosed in the tubular labium.
The labium is a single organ which projects beneath the aperture of the mouth.
Rostrum (= labium + labial palpi) rather long but very weak and pale, consisting of two or three segments inclusive of the unpaired basal segment.
Now the mouth-parts of the flea for which only technical names exist are the maxillæ and maxillary palpi, the labium and labial palpi, the mandibles and the labrum.
A pull on the labium will sometimes bring out the pharynx.
These are sheathed by the labium and labial palpi.
The four segmented labium or proboscis encloses the lancet-like maxillae and mandibles.
The transformed larvae then reenter the body cavity and finally the majority of them reach the interior of the labium (fig.
The movements of the elevated abdomen grow noticeably feebler as the downward thrusts of the springy bow-like labium becomes less frequent.
The labium doubles back, the V-shaped groove of this organ guiding the mandibles on either side.
The manner in which this occurred was not obvious, for when the insect feeds it inserts only the stylets, the labium itself remaining on the surface of the skin.
The labium is placed between the two coxæ of the maxillæ.
The labium is suboval, clothed thickly with simple short hairs, the upper margin having a single row of long heavy straight hairs with many long single curved hairs covering them.
On each side of the proboscis is a lip-feeler or labial palpus, for the organ represents the labium of other insects.
It has also a broad, notched, and toothed lower lip, or labium (fig.
In the male the labium is emarginate, in the female it is intire.
They have maxillæ, and in the labium is the orifice of the salivary glands, from which they spin the threads used in weaving their cocoons, or social tents.
Four naked veined wings, labium mostly elongated, the two pairs of maxillæ acting above it like spears.
The dwellings are fabricated by the maxillæ, which but seldom serve as cibarial instruments, seeing that the labium undertakes this office as a lick-organ.
These last open at a small orifice in the labium termed the spinneret (fig.
In some Coleoptera the labium is reduced to a stiff spine, while in the Stag-beetle it is flexible and hairy, and foreshadows the licking tongue of the Bee.
The homology of the labium with the first pair of maxillæ is in no other Insects so distinct as in the Orthoptera.
All these parts are overtopped by the suctorial labium (Lm), which has a two-lobed expansion at the end.
The tip of thelabium is sometimes produced into a long tongue, called the ligula (strap).
In Hemiptera the long four-jointed labium (Lm) forms a sheath for the stylets.
Of these last the Bee has the edges of the labium turned down, so that the siphon becomes ventral; in the Bug and Fly the edges are turned up, and the siphon becomes dorsal.
The palps of the maxillæ and labium have been variously regarded as sensory and masticatory instruments.
By stripping off the labium upwards it may be seen that it is really continuous with the chitinous integument of the neck.
The labial palps, indeed, which are not at all developed in the caterpillar, survive, and become important parts in the moth; but the greater part of the labium disappears when the time for spinning the cocoon is over.
The mouth of the Cockroach is enclosed between the labrum in front, and the labium behind, while it is bounded laterally by the mandibles and first pair of maxillæ.
The labium is indirectly concerned as completing the mouth behind and supporting the lingua, which is possibly of importance in the ordinary operations of feeding.
The labium undergoes marked adaptive change, without great deviation from the common plan, in the “mask” of the larva of the Dragon-fly.
Except where the labium is short, it is doubly or trebly hinged, so that it can be readily tucked away under the chin.
The labiumand maxillae are a little longer than usual and are partly covered by the first legs.
The labium is long and narrow, and forked at the end (fig.
The labiumis narrowed at the end and a little longer than wide (fig.
The labium and maxillae are like those of Clubiona and the palpi very slender.
The maxillae are straight, with the sides nearly parallel, and the labium is shorter than wide.
The labium is shorter than wide and rounded or slightly pointed at the end.
The labiumis short and the maxillae straight, as in Agroeca and Anyphaena, but wider at the base (fig.
The maxillae and labium are like those of Clubiona, but the sternum is shorter and rounder.
The labium is short and the maxillae straight, as in Anyphaena.
The labium is not longer than wide, and the maxillae are straight, with the sides parallel.
The labium is as wide as it is long, narrowed toward the end but truncated at the tip.
The labium is short and the maxillae with straight sides.
The labium is as long as it is in Drassus, but contracted at the base.
The labium is long and the maxillae slightly widened at the end, or with the outer corners rounded off and sometimes a crease or depression in the middle.
Hypoglottis: a sclerite inserted between rectum and labium in many Coleopteran.
Hypopharynx: a sensitive and sensory structure on the upper surface of labiumthat serves as an organ of taste, or true tongue.
Epipharynx: an organ, probably of taste, attached to the inner surface of the labium and supposed to correspond to the palate of higher animals Epiglossa or epiglottis.
