Name the internal intercoastal's insertion, origin, and action.


Name the internal intercoastal's insertion, origin, and action.

Thoracic Wall:

The thoracic cavity is located within the ventral cavity and is the location of the heart, lungs and diaphragm. This important structure is supported by a bony framework the arises from the 12 thoracic vertebrae which are the attachment site for the 12 pairs of ribs that encircle the cavity. The ribs meet anteriorly at the sternum, or the breast bone, and are supported by layers of muscles including the external, internal, and innermost intercostal muscles, that function to change the volume of the thoracic cavity during respiration.

Answer and Explanation: 1

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Internal intercostals: middle layer of the intercostal group (between the external and innermost intercostals)

  • Origin: costal groove of the ribs
  • In...

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Function & Anatomy of the Muscles of the Chest and Abdomen


Chapter 17 / Lesson 11

Read about abdominal muscle and chest muscle anatomy. See abdominal and chest muscle diagrams and learn about major abdominal and chest muscle groups.

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