The anatomy of the thoracic cage provides ridged support and protection but at the same time is also flexible and mobile. Of the list below, which feature does not aid in the flexibility and movement of the thoracic cage?

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The jugular notch is a depression on the superior surface of the sternum and does not contribute to the flexibility and movement of the thoracic cage. The other choices are involved in the movement and flexibility of the thoracic cage. The costal cartilages are flexible and enable the ribcage to expand during inspiration and contract during expiration. The costal spaces occupied by costal muscle enable movement of the ribs during respiration. The sternal angle, also known as the angle of Louis, is an important landmark for determining the level of the second rib and the site of tracheal bifurcation, and it also allows flexion and extension of the thoracic cage during breathing.

The Anatomy of the Thoracic Cage Provides Ridged Support and Protection