Anatomical and morphometrical study of middle ear ossicles in 2 to 3-month-old Makouei sheep fetuses

• Published in: Veterinary research forum 2017-01, Vol.8 (3), p.237-241
• Main Authors: Simaei, Naeimeh, Soltanalinejad, Farhad, Najafi, Gholamreza, Jalali, Ali Shalizar
• Format: Article
• Language: English
• Subjects: Age; Anatomy & physiology; Bones; Fetuses; Middle ear; Morphology; Original; Physiology; Sheep; Sound; Studies; Thermometers
• ISSN: 2008-8140; 2322-3618

The results showed that rostral process of malleus doesn't exist, but an osseous lamina extending to the tympanic bulla and tympanic ring is located in this place. [...]lenticular bone and muscular process of stapes weren't found. The transmission of sound waves across the tympanic cavity is mediated by three auditory ossicles including malleus, incus and stapes in a lateromedial sequence.4 These ossicles are placed in the middle part of tympanic cavity5 and form a chain across the tympanic cavity from tympanic membrane to fenestra vestibuli.6 The malleus is the most lateral and the largest of the three bones, consists of head, neck and handle attaching to the tympanic membrane.7 The incus articulates with the head of the malleus by means of its body and the latter articulates with the head of the stapes through its long crus.5 The stapes is attached to the edge of the oval window.5 Several anatomical and morphological studies have been conducted to examine human and some animals middle ear ossicles. The stapes crura were seen in a symmetrical (Fig. 4C) and/or asymmetrical manner (Figs. 4A and 4B). [...]stapes intercrural foramen was observed as an oval-shaped hollow (Fig. 4A) and/ or very tiny recess (Figs. 4B and 4C). There were significant differences between 84day-old and 74- and 76-day-old fetuses regard to the length of malleus handle (p < 0.05), whereas there were no significant differences among 84- and 81-day-old fetuses (p > 0.05). [...]there were significant differences between 81-day-old and 74- and 76-day-old fetuses regard to the length of malleus handle (p < 0.05).