Search results
Results from the WOW.Com Content Network
Halipegus eccentricus is a monoecious, digenea parasitic trematode commonly found in true frogs in North America.It was first described in 1939. [1]H. eccentricus is mainly found in the Eustachian tubes of a variety of frog species, its definitive host, although its life cycle involves other hosts, as is common for trematodes.
The Eustachian tube (/ j uː ˈ s t eɪ ʃ ən /), also called the auditory tube or pharyngotympanic tube, [1] is a tube that links the nasopharynx to the middle ear, of which it is also a part. In adult humans, the Eustachian tube is approximately 35 mm (1.4 in) long and 3 mm (0.12 in) in diameter. [ 2 ]
All native New Zealand frogs (pepeketua in Māori) share tail-wagging muscles, inscriptional ribs, round pupils, and a lack of eardrums, eustachian tubes, and vocal sacs. These frogs, in some ways more similar to salamanders than modern frogs, use chemical signals over acoustic signals to mark habitat and recognize competitors. [8]
Senegal running frogs are relatively small and stocky. The vomer teeth of the upper mouth are arranged in two small groups. The tongue is heart-shaped. The Eustachian tube is quite small, and the eardrums are indistinct from the layer of skin covering them. Its four unwebbed fingers ordered from shortest to longest are its first, second, fourth ...
A frog's ear drum works in very much the same way as does a human eardrum. It is a membrane that is stretched across a ring of cartilage like a snare drum that vibrates. Crossing the middle ear chamber there is an ossicle called the columella that is connected to the tympanum, and another ossicle, the operculum, that connects this to the oval ...
Depending on the type, the tube is either naturally extruded in 6 to 12 months or removed during a minor procedure. [16] Those requiring myringotomy usually have an obstructed or dysfunctional Eustachian tube that is unable to perform drainage or ventilation in its usual fashion. Before the invention of antibiotics, myringotomy without tube ...
The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.
A phylogeny showing when gill slits may have arisen. It is thought that gill slits were subsequently lost in echinoderms.. The presence of pharyngeal slits in hemichordates led to debates of whether this structure was homologous to the slits found in chordates or a result of convergent evolution. [10]