Your chest muscle has two parts—one on top near your collarbone and one lower near your breastbone—and because they work a bit separately, it might affect how doctors fix injuries and how well you heal.

In dead human bodies, the big chest muscle has a regular upper part and a lower part made of 6 to 7 separate pieces, where the lowest piece bends forward to hold the one above it — a pattern that might affect how the muscle works or heals after surgery.

The chest muscle in dead bodies has a top part that's smooth and a bottom part made of 6 to 7 separate chunks, where the lowest chunk wraps around the one above it like a cradle — this unique shape might change how the muscle works and how doctors fix it in surgery.

The big chest muscle has two parts: one on top with smooth, even fibers, and a lower part made of 6 or 7 separate bundles, where the bottom one folds forward.

In the chest muscle, the upper part has longer fibers toward the bottom, and the lower part has its longest fibers in the middle — this might mean different parts of the muscle do different jobs.

In dead bodies, the big chest muscle's tendon has two layers—one in front and one in back. The front layer is longer, and they join together at the bottom, which might affect how doctors fix it in surgery and how it handles force.