Respiratory System

Just Breathe!

The Nose (canine)

1. Nasal Plate

2. Nasal Philtrum

The canine head showing respiratory apparatus1. Nostril; 2, 3, 4 Nasal concha; 5, Frontal sinus; 6. Hard palate; 8. Tongue; 8’ Oropharynx (the space); 9. Soft palate; 10’ Nasopharynx (the space); 10 Epiglottis; 12 trachea; 13 Esophagus

Paranasal Sinuses

Canine Porcine

Laryngeal Cartilages in the Horse1. Epiglottic; 2. thyroid; 3. cricoid; 4 arytenoid; 5 trachea; 6.

cricoarytenoid joint; 7. crocothyroid joint

2. (You do not have to be able to name these all.

Complex muscles control laryngeal movement

Median section of Equine larynx1. Epiglottis; 2. corniculate process of arytenoid cat.; 3 Vestibular fold; 4 Vocal fold (cord); 5. Laryngeal ventricle; 6. Lamina of cricoid cart; 7. Cricothyroid ligament

Photograph of the same section

Transverse section of larynx2. Glottis; 3. Vocal ligament in vocal fold; 8,9,10 laryngeal cartilaages; 4, 5, 6 laryngeal musclesExamples: Roaring horses, laryngeal hemiplegia

Transverse section of A canine and B bovine tracheas

1. Mucous membrane; 2 tracheal cartilage; 4. Tracheal muscle (external in dogs, internal in cattle.

Schematic of the Pleural Cavity

1. Costal pleura; 2. Mediastinal pleura; 3. Diaphragmatic pleura; 4. Visceral Pleura; 5. Diaphragm 6. Pericardium

Transverse Section of the canine thoraxNote the heart suspended within the pleura and the pericardium. 1,2 pleura; 4. pericardium; 6 aorta; 7 esophagus; 8 tracheal bifurcation; 10 heart

The Canine Thorax (for orientation)

Lungs

A, B Pig C, D Dog

Pig Lungs

1. Trachea; 2 pulmonary trunk; 3. Pulmonary veins; 4 Bronchus

Equine Lungs and Heart

Structures to Note

• Trachea• Bronchi• Bronchioles• Texture of alveoli