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THORACIC CAVITY RESPIRATORY DIAPHRAGM. Diaphragm A diaphragm is a muscular sheet with an inferior and a superior fascia: A diaphragm is a muscular sheet.

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Presentation on theme: "THORACIC CAVITY RESPIRATORY DIAPHRAGM. Diaphragm A diaphragm is a muscular sheet with an inferior and a superior fascia: A diaphragm is a muscular sheet."— Presentation transcript:

1 THORACIC CAVITY RESPIRATORY DIAPHRAGM

2 Diaphragm A diaphragm is a muscular sheet with an inferior and a superior fascia: A diaphragm is a muscular sheet with an inferior and a superior fascia: Superior fascia = parietal thoracic fascia. Inferior fascia = transversalis fascia. Separates thorax and abdomen. Separates thorax and abdomen. In moderate expiration: In moderate expiration: Reaches level of 5 th rib on right side and 5 th IC space on left.

3 Diaphragm Origins Sternal part: Sternal part: Xiphoid process. Costal part: Costal part: Lower 6 ribs and cartilages. Lumbar part: Lumbar part: Lumbar vertebrae and crura: Right: L1-L3 Left:L1-L2

4 Central Tendon “Y-shaped” “Y-shaped” Attaches to lumbar vertebrae via crura. Attaches to lumbar vertebrae via crura. Pierced by three openings (described later). Pierced by three openings (described later).

5 Central Tendon Three parts to central tendon: Three parts to central tendon:Right: Largest part. Middle:Left: Smallest part. Fig Fig. 2.71

6 Crura Muscular pillars Muscular pillars Originate from lumbar vertebrae: Originate from lumbar vertebrae: Right from L3. Left from L2. Right swings left and forms a weak sphincter around the esophagus.

7 Arcuate Ligaments Median: Median: Around aortic opening. Bridges proximal ends of crura. Medial: Medial: From deep fascia of psoas major muscle. From transverse process to body of L1. Lateral: Lateral: From deep fascia of quadratus lumborum muscle. From transverse process of L1 to rib 12.

8 Diaphragm Openings Caval opening: Caval opening: Level T8 Inferior vena cava; right phrenic nerve Esophageal opening: Esophageal opening: Level T10 Esophagus; vagus nerves Aortic opening: Aortic opening: Level T12 Aorta; thoracic duct; azygos vein

9 Diaphragm Innervation Phrenic Nerve Phrenic Nerve C3-5 C3-5

10 Diaphragm Arterial Supply Superior aspect: Superior aspect: Pericardiacophrenic artery from IT. Musculophrenic artery from IT. Superior phrenic artery from aorta. Inferior aspect: Inferior aspect: Inferior phrenic artery from aorta.


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