جستجوی مقالات مرتبط با کلیدواژه « middle ear » در نشریات گروه « دامپزشکی »

The middle ear is an irregular cavity composed of three ossicles, malleus, incus, stape, which transmit sound waves to the inner ear and converted into mechanical energy. Due to the importance of the middle ear in voice transmissions this study was established. In this research, in order to investigate morphologically, the details of sus scrofa Atilla middle  ear ossicles, 5 matured male animals skulls were used. After anatomical examination of different parts of the temporal bone and removing the bones, the middle ear bones were exposed, in addition to examine the shape, dimensions and details of each bone were measured using an ocular micrometer. Finally, data were evaluated and analyzed using the Sigma Statt statistics software. In sus scrofa Atilla, temporal bone, similar to other animals, consisted of three parts: squamous, tympanic and petrous part. The length of the outer ear canal to the tympanic membrane is 37±0.14 mm. The tympanic membrane is circular in animal and the diameter of the tympanic membrane is about 12.5±0.21 mm. The tympanic membrane has also Beige color. In the boar, the number of middle ear ossicles was three, including Malleus, Incus and Stapes. Morphometric results showed that the Malleus ossicle had a head, neck, handle and three distinct process including anterior, muscular and lateral process. Incus ossicle  consists of a body, two long and short crura and has two articular surfaces. A short or posterior crura attaches to the posterior wall of the body and the long crura are connected to the stape ossicle. The Stape ossicle has a footplate and three anterior, posterior, and muscular process which anterior process is shorter than posterior. In the present study, the components of the middle ear in the boar was investigated. It was determined that the number of middle ear ossicles in the boar was similar to pigs, and the only difference was the size of the ossicles processes.

The aim of this study was to determine the anatomical features of the auditory ossicles in rat. Twenty temporal bones from 10 adult rats were used. The features of the ossicles were assessed with an ocular micrometer and photographed by a stereomicroscope. Finally, all data were evaluated and analysed using the Sigma Statt software. Temporal bone in rat was similar to other animals consists of three parts; squamous, tympanic and petrous. Tympanic bulla was cone shaped and its base was adjacent acoustic meatus caudolaterally. Average tympanic bulla height and length of the ear canal were 8 mm and 1 -1.5 mm respectively. The auditory ossicles were three bones: the malleus, the incus, and the stapes. The lenticular bone was a distinct bone, articulated with the tip of the long crus of incus. Morphometrical rtesults showed that the malleus was 3.34 ± 0.03mm in total length. In addition to head and handle, the malleus had three distinct processes; lateral, anterior and muscular. The incus had a total length 1.18 ± 0.04mm. It had long and short crura although the long crus developed better than short crus. The stapes had a total length 0.79 ± 0.03mm. It had a stapedial base with anterior and posterior crura. The length of anterior crus was more than posterior.