Canine dissection. Begin opening the thoracic cavity by making bilateral incisions (arrows) at least one cm from the ventral midline. Then make a caudal incision detaching the sternum from the abdomen.

Notice the rectus abdominis m. (1), the deep pectoral m. (2), and brachial plexus nerves (3). The serratus ventralis muscle (4) has been detached from he thoracic wall.

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