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Central tendon of diaphragm

Dr James Ling et al.

The muscle fibers of the diaphragm converge and attach to the central tendon of the diaphragm. It is a thin but strong layer of aponeurosis which forms an intergral part of respiration.

On this page:

Article:

Gross Anatomy
Structure
Innervation
Action
Related articles
References

Gross Anatomy

The central tendon of the diaphragm is located near the center of the diaphragmatic muscle but lies more anteriorly than posteriorly, meaning the posterior muscle fibers are longer than the anterior fibers ¹. It is shaped like a club on a deck of cards. It has three leafs which are separated by small indentations. The right leaf is the largest, the middle is the second largest and directed anteriorly towards the xiphisternum and the left leaf is the smallest.

Structure

The central tendon of the diaphragm is composed of interlaced fibers which join at various angles to form bundles which give it its strength. It lies just inferiorly to the fibrous pericardium to which it is embryonically identical and inseparable ².

Relations

The vena caval foramen passes through the tendon at the level of the T8 vertebra, posterior to the 6th costal cartilage and to the right of the midline ¹. The inferior vena cava and right phrenic nerve pass through this opening.

Innervation

The diaphragm is supplied by the phrenic and lower intercostal nerves ².

Action

With inspiration the central tendon is drawn inferiorly by the diaphgram. This expands the chest cavity and creates negative inter-thoracic pressure allowing air to enter the lungs ³. The inferior vena cava is not compressed in the foramen due to its tendinous nature.

References

Anatomy: Thoracic

thoracic skeleton
- thoracic cage
  - ribs
    - typical ribs
    - atypical ribs
    - variant anatomy
      - bifid ribs
  - costal cartilage
  - sternum
- thoracic spine
- articulations
muscles of the thorax
spaces of the thorax
thoracic viscera
blood supply of the thorax
- arteries
  - thoracic aorta (development)
  - pulmonary trunk
    - left pulmonary artery
      - aberrant left pulmonary artery
    - right pulmonary artery
- veins
  - superior vena cava (cavoatrial junction)
  - inferior vena cava
  - coronary veins
    - cardiac veins which drain into the coronary sinus
      - great cardiac vein
      - middle cardiac vein
      - small cardiac vein
      - posterior vein of the left ventricle
      - vein of Marshall (oblique vein of the left atrium)
    - anterior cardiac veins
    - venae cordis minimae (smallest cardiac veins or thebesian veins)
  - pulmonary veins
    - bronchial veins
lymphatics
innervation of the thorax

Article information

rID: 50692

System: Chest

Section: Anatomy

Synonyms or Alternate Spellings:

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