What is the diaphragm divided into

First divided into the muscular part and a central tendon Muscular part is then divided into Sternal → two fleshy slips from the back of the xiphoid process Costal → Internal surfaces of the lower 6 costal cartilages and their adjoining ribs Lumbar → Divided further into 2 parts depending on their origin : Medial and lateral arcuate ligaments From the ventral bodies