Author
Abstract
The trachea of the local sheep is a tubular structure that begins at the cricoid
cartilage of the larynx and ends when it bifurcates to form the principle bronchi,
composed of series of incomplete rings that were incomplete dorsally present between
of them longitudinal folds.
The study include twelve specimens divided into four groups grossly,
histological study, cast and radiography. The anatomical study include the mean total
tracheal length from the first ring to the bifurcation about (25.9 cm) , mean number of
cartilaginous rings (48.6), mean number of folds (45), measured the length of trachea
from the cricoids cartilage to the trachealis bronchus which enter to the cranial lobe of
lung which branches from the trachea in last third before divided into two bronchi
right and left each of one enter the lung for respiration also measure diameters of each
tracheal ring which deference according the position of rings, which decrease of
diameters when direction caudally to the root of lung the rings have different shape in
the three parts of the trachea cervical, middle and thoracic the histological study
showed the trachea lining pseudo stratified ciliated columnar epithelium with goblet
cells, the wall of trachea consist of mucosa, submuosa, hyaline cartilage and
adventitia and have large amount of tracheal gland,the trachealis muscle composed of
elastic fibers interupted with smooth fibers.
The cast of trachea showed the bronchial tree and radiography explain the
trachea , bronchi and bronchioles.
Keywords
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