Abstract
Authors describe the lower respiratory tract between sheep (Ovis aris) and goat(carpus hircus) by involved five adult male sheep and goats to investigate the anatomical features of lower respiratory tract in indigenous sheep and goat. The samples of the lower respiratory tract were collected from Baghdad slaughter house the external feature trachea and lung deals with the shape, weight, relationship, ligamentation and position of the lower respiratory tract. The trachea in both species was long flexible hollow tube with uncompleted cartilagenous rings were situated in the median line of cervical region ventrally, trachea was showed started from the first tracheal ring cartilaginous with the cricoids cartilage of the larynx. trachea was composed of two regions airway; cervical and thoracic, the tracheal ring shape were C shape in goat and U shape in sheep, the numbers of tracheal rings in sheep and goat were 49.2 ± 0.37, 51.2 ± 0.47, respectively. The total mean length of the right and left main bronchi in both sheep and goat were 2.26±0.092cm, 2.10±0.077cm, 2.12±0.037cm, 1.96±0.005cm, respectively. The total mean tracheal length in both sheep and goat were 30.4± 0.50cm, 24.7±0.34cm, respectively. The lungs of both animals look like spongy soft organ, surrounded the heart which was located in the mediastinum and enveloped by visceral and parietal pleura. The lung of both animals have anterior apex and posterior base, lung composed right and left lobe the right apical lobe subdivided into cranial and caudal part while undivided in goat, both animals left lung composed of apical and caudal lobe, the apical was subdivided into cranial and caudal part
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