Two pairs of salivary glands open into the buccal cavity.
Of the salivary glands the parotid is by far the largest, elongated in the vertical direction, and narrower in the middle than at either end.
A, Anus; at, antenna; F.I, F.2, first and second feet; j, jaws; L, lips; oe, oesophagus; or.p, oral papilla; ph, pharynx; R, rectum; s.d, salivary duct; s.g, salivary gland; sl.d, slime reservoir; sl.g, portion of tubules of slime gland; st, stomach; T, tongue in roof of mouth.
The salivary glands are the modified nephridia of the segment of the oral papillae.
They enclose the jaws (j), mouth (M), and opening of the salivary glands (o.·), and so give rise to the buccal cavity.
The jaw somite also disappears; the oral papilla somite forms ventrally the salivary glands, which are thus serially homologous with nephridia.
Two pairs of salivary ducts, each leading from a salivary gland, open into the buccal chamber.
Salivary glands are present, and in some carnivorous forms (Dolium) these secrete free sulphuric acid (as much as 2% is present in the secretion), which assists the animal in boring holes by means of its FIG.
The gullet leads into a moderate-sized crop, and several pairs of salivary glands open into the mouth.
D) consisting of paired conical processes which lie dorsal to the " syringe " of the salivary glands.
In 1898 it was conclusively shown in Italy that if a mosquito E of the Anopheles variety bites a person suffering from malaria, and is kept long enough for the parasite to develop in the salivary gland, and is then allowed to bite a healthy person, the latter will in due time develop malaria.
T, Salivary gland.
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 larvae known as caddis-worms are aquatic. The mature females lay their eggs in the water, and the newly-hatched larvae provide themselves with cases made of various particles such as grains of sand, pieces of wood or leaves stuck together with silk secreted from the salivary glands of the insect.
The mouth, situated at the opposite end and armed with a pair of stylets, leads into an oesophagus, into which the ducts of a pair of so-called salivary glands open.
F, Salivary glands.
S, Salivary glands and reservoir.
Sal, Prosomatic pair of gastric caeca in Scorpio, called salivary glands by some writers.
A salivary gland degenerates when its nerve-supply is cut off.
Swelling at base of jaws; L, lips; M, mouth; or.p, oral papillae; o.s, opening of salivary gland.
2), says, " Krohn stated that the structures described by my father as ovaries were in reality salivary glands, also that the oviduct runs down to the orifice described in the Monograph of the Cirripedia as the auditory meatus."
Hoek, however, observes that the interpretation of the glands as salivary is not given by Krohn as his own opinion, but only quoted from Cuvier.
Is close to the salivary gland.
The poison is secreted in modified upper labial glands, or in a pair of large glands which are the homologues of the parotid salivary glands of other animals.
Neomenia and other genera have no salivary glands.
The salivary glands.
Macmillan & Co., Ltd.) b, bristle; cs, caudal spine; ph, pharynx; s s', the spines on the two segments of the proboscis; sg, salivary glands; st, stomach.
Into the pharyngeal cavity open salivary glands and radular sac. The former are paired and ventral, and open on a subradular prominence.
This latter result is due to paralysis of the chorda tympani nerve, which is mainly responsible for the salivary secretion.
When swallowed it rapidly causes a great increase in the salivary secretion, being one of the most powerful sialogogues known.
This induces a reflex secretion from the salivary and gastric glands, which is followed or accompanied by increased vascularity of the gastric mucous membrane, and by some degree of activity on the part of the muscular wall of the stomach.
Mouth And Salivary Glands >>
All young grubs are at first fed with a specially nutritious food, discharged from the worker's stomach, to which is added a digestive secretion derived from special salivary glands in the worker's head.
Salivary glands, of which the most constant are the parotid and the submaxillary, are always present in terrestrial mammals.