2010, Vol. 5 No. 2, Article 71
A Note on Hyoid Bone of Yak (Bos grunniens)
K. B. Dev Choudhury*1 and M. Bhattacharya
National Research Centre on Yak
1Department of Veterinary Anatomy,
*Corresponding Author; e-mail address: firstname.lastname@example.org
Gross anatomical study of hyoid bone of yak was conducted. The bone consisted of stylohyoid, epihyoid, ceratohyoid, basihyoid and thyrohyoid parts. The corresponding parts of hyoid bone of male yak measured larger than that of the female. Anatomical structure of hyoid bone of yak was comparable to that of ox except that in yaks the thyrohyoid was found fused with the basihyoid in both sexes.
Hyoid bone, yak.
The yak is an animal of choice at high altitudes. Paucity of literature on the hyoid bone of yak was noted. Hence, the present study was undertaken.
MATERIALS AND METHODS
The study was conducted on adult male and female (N=2) yaks that were apparently free from any chronic disease. After slaughtering the animals, the hyoid bones were carefully dissected out and cleaned properly. The measurements of different parts of hyoid bones were recorded with the help of vernier calipers.
The hyoid bone was found lying between the two rami of mandible supporting the root of the tongue, pharynx and larynx. Gross examination revealed that the bone consisted of stylohyoid, epihyoid, ceratohyoid, basihyoid and thyrohyoid parts (Fig. 1). Sisson (1975) and Ghosh
(2003) observed similar anatomical structure of hyoid bone in ox. Measurements (Table 1) of different parts of the bone showed a considerable variability. The corresponding parts of hyoid bone of male measured larger than that of female yak.
In light of the present observations and previous reports it can be inferred that grossly the hyoid bone of yak is comparable to that of ox except that in yaks the thyrohyoid lies fused with the basihyoid in both sexes.
Authors are thankful to the staff members of National Research Centre on Yak I.C.A.R., Dirang, Arunachal Pradesh for their help during the research work.
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