(A) Buccal cavity (B) Nasal Cavity (open to pharynx) (C) Inferior maxillary sinus (D) Superior maxillary sinus (E) Frontal sinuses (F) Guttural pouch (G) Pharynx (H) Trachea (I) Bronchus (J) Alveolus (K) Lungs (L) Larynx
The organs of the respiratory system, except the air cells, are lined with a tissue called mucous membrane. The nasal chambers, which extend from the nostils to the pharynx and are seperated from each other by cartilage.
The larynx (also know as Adam's apple) is situated at the front of the trachea. It gives passage to air and is also the voice box.
The trachea consists of 40 to 50 cartilaginous rings, depending on the length of neck. It runs down the neck, enters the chest and ends at the base of the heart where it then branches into the left and right bronchi. The bronchi then enter the lungs and subdivide into branches called bronchial tubes.
The horse differs from other mammals in that they do not breath through their mouth. The naval cavity of a horse is quite long compared to that of other mammels. This is an advavtage in cold weather because it allows the incoming air to be warmed before it reaches the lungs.
