. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. Chapter 6—Respiratory System 1 2 3 105. Fig. 6-6. Thorax, right lateral view (intercostal muscles removed). 1 thoracic part of longissimus m., 2 thoracic part of semispinalis m., 3 iliocostalis m., 4 splenius m., 5 cranial lobe of lung, 6 heart, 7 middle lobe of lung, 8 caudal lobe of lung, 9 diaphragm. heres tightly to the surface of the lung and follows its outline. The pulmonary ligaments, ligg. pulmon- ales, are folds of pulmonary pleura that leaves the dorsomedial surface of each lung caudal to its hilus. They attach the caud
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. Chapter 6—Respiratory System 1 2 3 105. Fig. 6-6. Thorax, right lateral view (intercostal muscles removed). 1 thoracic part of longissimus m., 2 thoracic part of semispinalis m., 3 iliocostalis m., 4 splenius m., 5 cranial lobe of lung, 6 heart, 7 middle lobe of lung, 8 caudal lobe of lung, 9 diaphragm. heres tightly to the surface of the lung and follows its outline. The pulmonary ligaments, ligg. pulmon- ales, are folds of pulmonary pleura that leaves the dorsomedial surface of each lung caudal to its hilus. They attach the caudal lobes of the lungs along their dorsomedial borders to the mediastinum. A separate fold of pulmonary pleura extends from the dorsal surface of the accessory lobe of the right lung to the caudal mediastinum (It attaches to the right wall of the infracardiac bursa). The mediastinum is the endothoracic fascia and mediastinal pleura along the midline of the thorax. It encloses the thymus, thoracic duct and lymph nodes, heart and blood vessels, trachea and bron- chi, and the vagus, phrenic and sympathetic nerves. The heart divides the mediastinum into cranial, middle and caudal divisions. The cranial mediasti- num lies in front of the heart, the middle medias- tinum contains the heart and the caudal mediasti- num lies caudal to the heart. The infracardiac bursa, cavum mediastini serosum, is a closed serous cavity to the right of the esophagus in the caudal mediastinum. The cavity extends from the dia- phragm to the heart and can communicate with the peritoneal cavity through the hiatus esophageus of the diaphragm. Lungs. The lungs, pulmo (Figs. 6-6 to 6-8), ex- tend laterally from the mediastinum. They reduce the pleural cavity to a potential space. The lungs are pyramidal in shape with a narrow apex, apex pulmonis, and a broad base, basis pulmonis, which rests on the diaphragm. Each lung is bounded dor- sally by the thoracic vertebral bodies, laterally by the ribs and costal ca
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