13 Msc. The large chest muscles originate from the ribs of the breastbone and the middle of the collarbone, ending with a strong tendon under the deltoid-shaped muscles, approximately below the head of the shoulder blade, and aid in the drawing motion of the arm.

14 Msc. The straight muscles are divided into two parts, originating under the pointed end of the breastbone cartilage and ending in the form of a pointed pyramid at the pubic bone, helping with the compression or constriction of the abdomen.

15 Msc. The large serratus muscles originate internally from the base of the shoulder blade and end tooth-like with those extending downward, helping to expand the chest.

16 Msc. The muscles extending downward originate from the serratus muscles with a tooth-like or hooked appendage and attach fleshy to the iliac bone, ending in the white linea (line), which along with those extending upwards, help compress the abdomen.

17 Msc. The white linea begins at the pointed cartilage of the breastbone and ends at the pubic bone.

Translation Notes

- **"Breastbone"** refers to what is commonly known today as the sternum.

- **"White linea"** refers to the "linea alba," a fibrous structure running down the midline of the abdomen.

- **The term "tooth-like" in the context of muscle shapes generally describes the serrated or jagged edges typical of certain muscles.