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DESCRIPTION. Scalenus anterior is one three deep muscles in the scalene group. ORIGIN. Scalenus anterior originates from the anterior tubercles of the transverse processes of the third, fourth, fifth and sixth cervical vertebrae. Cervical Spine Muscles Scalenes chiropractor 3D animation.DESCRIPTION. Scalenus medius is one three deep muscles in the scalene group. ORIGIN. Scalenus medius originates from the transverse process of the axis and the front of the posterior tubercles of the transverse processes of the lower five cervical vertebrae.ervical Spine Muscles Scalenes chiropractor 3D animation. INSERTION. Scalenus anterior inserts onto the scalene tubercle on the inner border of the first rib, and to a ridge on the upper surface of the rib, anterior to the groove for the subclavian artery.
Professional Rationale. The scalenes and the SCM can be hypertonic, contributing to Thoracic Outlet type symptoms, postural muscle imbalance, and upper quarter dysfunction. They can also elevate the first rib, further compromising the thoracic outlet and the brachial plexus.Client Rationale.hey are also accessory muscles to inspiration, lifting up the ribcage. When these muscles are tight, they can put pressure on the brachial plexus (where nerve roots meet and greet to form the nerves of the arm) and the thoracic outlet, causing pain and/or numbness and tingling in the arm.