Which action of the anterior scalene qualifies it as a muscle of respiration?
A)flexion of the neck at the spinal joints
B)lateral flexion of the neck at the spinal joints
C)elevation of the first rib at the sternocostal and costospinal joints
D)contralateral rotation of the neck at the spinal joints

Question

Quizplus · Accepted Answer

The elevation of the first rib at the sternocostal and costospinal joints is a respiratory action that helps to increase the volume of the thoracic cavity during inhalation. Therefore, the anterior scalene qualifies as a muscle of respiration. The other actions listed (flexion of the neck, lateral flexion of the neck, and contralateral rotation of the neck) do not directly contribute to respiration.

Which Action of the Anterior Scalene Qualifies It as a Muscle