Cat dissection: Elevate the sternum to observe the ventral mediastinum (asterisk) (sternopericardial ligament) attached to the sternum. Reflect the thoracic wall laterally, incising a caudal intercostal space (arrows) to facilitate the lateral reflection. Cut ribs as far dorsally as possible (double arrows) to expose thoracic viscera.

Notice the heart (1), the left lung (2), and internal thoracic a. (3).

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