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What is the origin insertion and action of the diaphragm?

What is the origin insertion and action of the diaphragm?

Origin: Ventral bodies of the second through fourth lumbar vertebrae via the diaphragmatic tendon. Insertion: Costal arch of the rib cage. Action: Inspiration. Nerve: Phrenic.

How does the thoracic diaphragm work?

The diaphragm is a thin skeletal muscle that sits at the base of the chest and separates the abdomen from the chest. It contracts and flattens when you inhale. This creates a vacuum effect that pulls air into the lungs. When you exhale, the diaphragm relaxes and the air is pushed out of lungs.

Which of the following is the origin insertion action or innervation for the diaphragm?

Which of the following is the origin, insertion, action, or innervation for the diaphragm? It is innervated by the phrenic nerve.

What is the insertion of the diaphragm muscle?

The muscle fibres of the diaphragm emerge from many surrounding structures. At the front, fibres insert into the xiphoid process and along the costal margin. Laterally, muscle fibers insert into ribs 6–12.

Where is the insertion for the diaphragm?

Origin and insertion It is attached anteriorly to the xiphoid process and costal margin, laterally to the 11th and 12th ribs, and posteriorly to the lumbar vertebrae.

What thoracic level is diaphragm?

It is located at the level of T10. The posterior and anterior vagal nerves are also found passing through this hiatus. Finally, the aortic hiatus is located between the two crura at the level of T12.

Can you control your diaphragm?

We do have some conscious control over our diaphragm muscle, exemplified by the fact that we can, at will (my emphasis), protrude our bellies (increase the circumference of our abdomens) and hold that posture, as well as consciously regulate how fast we inhale and exhale (as in panting).

What spinal level is the diaphragm?

What diseases or disorders affect the diaphragm?


  • Congenital defects, which happen at birth and have no known cause.
  • Acquired defects, which occur as the result of an injury, accident or surgery.
  • Stroke.
  • Muscular disorders, such as muscular dystrophy.
  • Multiple sclerosis.
  • Thyroid disorders.
  • Lupus.
  • Radiation therapy.

What level is diaphragm?

Where does the diaphragm muscle attach to the body?

Diaphragm Muscle. Origin: Attaches to the xiphoid process, the inner surface of the lower six costal cartilages and to the L1 through the L3 lumbar vertebrae. Insertion: Attaches to the central aponeurotic tendon. Actions: Inspiration and forced inspiration. Innervation: Phrenic nerve (C3, C4, C5)

How is the diaphragm related to the thoracic cavities?

The diaphragm divides the thoracic and abdominal cavities. Thus, any structure that pass between the two cavities will pierce the diaphragm. A tip for remembering the vertebral levels: vena cava has eight letters (T8), oesophagus has ten letters (T10), and aortic hiatus has twelve letters (T12).

How is the diaphragm involved in the expiration process?

Actions. The diaphragm is the primary muscle of respiration. During inspiration, it contracts and flattens, increasing the vertical diameter of the thoracic cavity. This produces lung expansion, and air is drawn in. During expiration, the diaphragm passively relaxes and returns to its original dome shape.

Where does the left crus of the diaphragm originate?

Left crus – Arises from L1-L2 and their intervertebral discs. The muscle fibres of the diaphragm combine to form a central tendon . This tendon ascends to fuse with the inferior surface of the fibrous pericardium.