What Is a Back Saw?

The serratas posterior inferior is located on the deep side of the latissimus dorsi muscle. It starts from the 11th and 12th thoracic spinous processes and the upper 1st and 2th lumbar spinous processes by the aponeurosis. -12 ribs outside the rib angle, the role is to pull down the ribs backwards, and fix the ribs to assist the exhalation movement of the diaphragm; innervated by intercostal nerves.

Lower posterior serratus

Right!

The serratas posterior inferior is located on the deep side of the latissimus dorsi muscle. It starts from the 11th and 12th thoracic spinous processes and the upper 1st and 2th lumbar spinous processes by the aponeurosis. -12 ribs outside the rib angle, the role is to pull down the ribs backwards, and fix the ribs to assist the exhalation movement of the diaphragm; innervated by intercostal nerves.

Serratas posterior inferior

It is located on the deep side of the middle of the latissimus dorsi. It starts from the lower two thoracic spine processes and the upper two lumbar spine processes through the aponeurosis. And fix the ribs to assist the exhalation movement of the palate. Innervated by intercostal nerves.