Anatomic Considerations on the Middle Ear in Dog
Keywords:
ear, hammer, anvil, ladder muscleAbstract
Purpose of this study is to explain some aspects of middle ear anatomy in dog. The study was conducted on five dog skulls (different ages) from common, large size dogs. The skulls were processed by maceration and submitted to a treatment of mechanical cleaning with perhydrol. The temporal bone was collected first; the external wall was opened carefully to study the tympanic cavity. The ossicles were collected separately and subsequently described. From research carried promontory appears as an elongated projection that separates the oval window and round window. Vestibular window is oval or slightly ovoid shape of a hole, located dorso-medially to the promontory, which communicates with the middle ear vestibule. Cochlearia window appears as a round or circular hole located caudo-lateral to the promontory . it is blocked by a membrane called the tympanum secondary, cavity separating the ramp of the snail. In the ventro-oral cavity openings ductus faringo tympanicum. The osicules sound represented by hammer, anvil and stirrup are articulated with each other and form a chain as a link between the eardrum and vestibular window. Bones are driven by two muscles: the tensor muscle and muscle stirrup eardrum is very thin. osicules ear are relatively large and resemble those of humans. Lenticular bone is the lenticular process of the long arm of anvile.
References
Balint Corneliu. Constituţia urechii medii la câine. Teza de doctorat, 1929.
Ellenberger, W., und H. Baum. Handbuch der Verglei chenden Anatomie des Haustiere ed. XVI, 1926.
O. Navez. Precis D’ anatomie descriptive du cheval. 1920.
Shambaugh G.E., Bloodstream in the labyrinth of the ear of the dog and man. Am. J.Anat. 1923, 32-189.
Schaller,O. (Editor): Illustrated Veterinary Anatomical Nomenclature, F. Enke Verlag, Stuttgart 1992;
Tudor, D; Ghe. M. Constantinescu: Nomina Anatomica Veterinaria, Ediţia a IV-a bilingvă, Editura Vergiliu, Bucureşti, 2002.
Acherson G.H., The topographical anatomy of the smooth muscle of the cat’s nictating membrane. Anat. Rec., 1938, 71-297.