Anterior Scalene

Anterior Scalene Origin

The scalenus anteriorThe front of the body or toward the front when standing in the anatomical position. muscle originates from the transverse processes of the third to sixth cervical vertebraeSmallest vertebrae; have transverse foramina for vertebral arteries; often bifid spinous processes.

Anterior Scalene Insertion

The muscle inserts onto the scalene tubercle of the first rib.

Anterior Scalene Actions

Neck Flexion

Lateral Flexion of the Neck

Elevating the First Rib

The anterior scalene is one of the scalene muscles. These muscles are thin and strap-like in your neck. They act like helper ropes, stabilizing and moving the cervical spineProminent ridge on the posterior scapula dividing it into supraspinous and infraspinous fossae. and ribsCurved bones forming the rib cage; articulate with thoracic vertebrae and most with the sternum.. The anterior scalene sits at the very front of the group (hence the name), tucked just behind the sternocleidomastoidFlexor / Rotator From sternum and clavicle to skull behind the ear; turns and bends the head..

It starts at the transverse processes of C3–C6 vertebrae. These are the little bony “wings” on the sides of those neck bones. It then runs downward and slightly outward to insert on the first rib. That diagonal course is important because it links the neck directly to the rib cage.

Functionally, the anterior scalene is a multitasker:

• When it contracts bilaterally (both sides together), it flexes the neck—think of bringing your chin down toward your chest.
• When it contracts unilaterally (one side at a time), it bends the neck laterally (ear toward shoulder). It also helps to rotate the neck a little.
• It attaches to the first rib. Therefore, it acts as an accessory muscle of inspirationThe process of inhaling, driven by diaphragm and external intercostal contraction.. It lifts the first rib upward to help expand the chest when you take a deepAway from the surface of the body. breath.