The diaphragm is a dome-shaped musculotendinous structure that separates the thoracic and abdominal cavities. It is the primary muscle of respiration and has openings that allow structures to pass between the chest and abdomen. The diaphragm develops from septum transversum, dorsal mesentery of the esophagus, lateral body wall mesoderm, and pleuroperitoneal membranes. It forms during embryonic folding and development of the pleural cavities. Clinically, abnormalities can include congenital diaphragmatic hernia, accessory diaphragms, or eventration of the diaphragm.

1. DR NEETA CHHABRA

2. Diaphragm
• Dome shaped thin
musculotendinous partition
between thorax and abdomen
• Most imp muscle of respiration.
• Pierced by structures that pass
between chest and abdomen.

3. Parts of Diaphragm

4. Developmental Components
Components Origin
Central tendon Septum transversum
Right & Left crura Dorsal mesentery of esophagus
Peripheral posterolateral part Mesoderm of lateral body wall
Small peripheral part Pleuroperitoneal membranes
Mesodermal in origin

5. Intraembryonic Coelom

6. Septum Transversum

7. Folding of Embryo

8. Development of Pleural cavities

9. Development of Diaphragm

10. TS At the level of T12 Vertebra

11. • Congenital diaphragmatic Hernia
• Accessory diaphragm
• Eventration of diaphragm
Clinical Anatomy

12. Clinical Anatomy

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