Journal Month: December
Published On: 11-10-2018 07:06:00
M.F. Al-Zghoul, Z.B. Ismail , R.K. Al-Rukibat and A.M. Al-Majali
Department of Basic Medical Veterinary Sciences, Faculty of Veterinary Medicine,
Jordan University of Science and Technology, Irbid 22110, JORDAN.
The objective of this study was to report comprehensive quantitative morphometric measurements of the trachea of young camels (Camelus dromedarius). Tracheas from 15 young male camels aged between 9 to 12 months were used to measure the length, number of tracheal cartilage rings, inner and outer diameters and thickness of the cartilage rings at four different tracheal regions (cranial cervical, middle cervical, thoracic inlet and intrathoracic). Furthermore, cross sectional area (CSA) of the tracheal rings were measured by two methods; a mathematical equation and a digital image analysis. The mean length of the trachea was 87 ± 0.83 cm, while the mean number of the cartilage rings was 77.1 ± 0.35. Diameters of the cartilage ring were smallest at the thoracic inlet region due to changes in tracheal direction and the narrow bone-surrounded thoracic inlet where the trachea enters the thoracic cavity. The ratios of the inner transverse to inner vertical and the outer transverse to outer vertical diameters ranged between 1.08 and 1.34. This indicates that the shape of the trachea in these young camels is near-circular. The CSA measurements obtained by the digital image analysis were 11-14% smaller than the CSA calculated by the mathematical equation (P < 0.01). Using digital image analysis to measure the CSA of tracheal rings provides accurate and reliable measurements. The CSA and cartilage thickness were smallest and thinnest at the thoracic inlet, respectively. This may be an important predisposing factor for tracheal disorders at this region.
Key words: Camel, cartilage, diameter, disease, trachea