Sun17October0936AM 7

Are the following true regarding the diaphragm?

True / False

Receives a nerve supply from both the phrenic and intercostal nerves Incorrect answer selected

The inferior vena cava passes through the diaphragm at the level of the T12 vertebra Correct

An opening in the central tendon transmits the left phrenic nerve Correct

The aorta passes through the diaphragm at the level of the T8 vertebra Correct

Develops from the septum transversum and cervical myotomes Incorrect answer selected

Explanation

The diaphragm develops in the neck and hence receives its nerve supply from the cervical spinal cord (C4-C5).

It is made up of structures arising from the:

Septum transversum

Pleuroperitoneal membranes

The dorsal mesentery, and

Body wall.

The septum transversum forms the central tendon.

The phrenic nerve is a bilateral structure and each nerve has a plexus that provides a motor supply to the ipsilateral side of the diaphragm.

Sensory fibres from the phrenic nerve supply the central part of the diaphragm, including the surrounding pleura and peritoneum. The nerve has branches that also supply sensation to the mediastinal pleura and the pericardium.

Additional peripheral sensory nerve supply is from the lower six intercostal nerves.

The IVC, oesophagus and aorta pass through the diaphragm at the levels of T8, T10 and T12 respectively.

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Average score: 61.86%

Times answered: 279