Anatomical characteristics o middle ear bones in rat
2014
Mohammadpour, A.A., Department o Basic Sciences, aculty o Veterinary Medicine, erdowsi University o Mashhad, Mashhad, Iran
The aim o this study was to determine the anatomical eatures o the auditory ossicles in rat. Twenty temporal bones rom 10 adult rats were used. The eatures o the ossicles were assessed with an ocular micrometer and photographed by a stereomicroscope. inally, all data were evaluated and analysed using the Sigma Statt sotware. Temporal bone in rat was similar to other animals consists o 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 o 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 o the long crus o 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 o anterior crus was more than posterior.
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