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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 ...
Species of the genus Niceforonia are small frogs measuring up to 21 mm (0.83 in) in snout–vent length. The head is narrower than the body and the tympanic membrane is differentiated, but in some species only the tympanic annulus is visible under skin.
Phrynopus are small to medium-sized frogs, from 14.5 mm (0.57 in) snout–vent length in Phrynopus auriculatus to 54 mm (2.1 in) in Phrynopus kauneorum. Head is narrower than the body. Differentiated tympanic membrane and tympanic annulus are usually absent, except in Phrynopus auriculatus and Phrynopus peruanus, two basal species.
In the anatomy of humans and various other tetrapods, the eardrum, also called the tympanic membrane or myringa, is a thin, cone-shaped membrane that separates the external ear from the middle ear. Its function is to transmit changes in pressure of sound from the air to the ossicles inside the middle ear, and thence to the oval window in the ...
The middle ear is the portion of the ear medial to the eardrum, and distal to the oval window of the cochlea (of the inner ear).. The mammalian middle ear contains three ossicles (malleus, incus, and stapes), which transfer the vibrations of the eardrum into waves in the fluid and membranes of the inner ear.
Species of the genus Bryophryne are smallish frogs, reaching maximum snout–vent length of 29.3 mm (1.15 in) in Bryophryne cophites. [3] Head is narrower than the body. Differentiated tympanic membrane, tympanic annulus, columella, and cavum tympanicum are absent. Dorsum is finely areolate whereas venter is coarsely areolate. [1]
The round window is situated below (inferior to) and a little behind (posterior to) the oval window, from which it is separated by a rounded elevation, the promontory.. It is located at the bottom of a funnel-shaped depression (the round window niche) and, in the macerated bone, opens into the cochlea of the internal ear; in the fresh state it is closed by a membrane, the secondary tympanic ...
Auditory ossicles from a deep dissection of the tympanic cavity. Sound waves travel through the ear canal and hit the tympanic membrane, or eardrum. This wave information travels across the air-filled middle ear cavity via a series of delicate bones: the malleus (hammer), incus (anvil) and stapes (stirrup).