Question

which of the following is a large collective group of muscles of the back which perform extension, lateral flexion, and rotation of the spine and/or neck? a.) sterncleidomastoid b.) infrahyoid muscles c.) splenius group muscles d.) erector spinae group

Explanation:

• The Sternocleidomastoid is mainly involved in head rotation and flexion, not the described functions for the spine and neck in a large collective way.
• The Infrahyoid Muscles are related to hyoid bone movement and laryngeal depression, not the spine - neck extension, lateral flexion, and rotation.
• The Splenius Group Muscles have some role in neck extension and lateral flexion but are not as large a collective group as the Erector Spinae Group.
• The Erector Spinae Group is a large collective muscle group of the back. It is responsible for extension, lateral flexion, and rotation of the spine and/or neck.

Answer:

d. Erector Spinae Group