Levator Claviculae
Neck
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The levator claviculae is a rare extra neck muscle in humans, but it is considered normal in many other mammals and primates. In people, it may be mistaken for a neck mass because it runs through the posterior triangle of the neck.
Function
Elevates the clavicle. It may also assist with lateral flexion of the neck and act as a small accessory muscle of respiration by helping lift the clavicle.
Origin
Transverse processes of the upper cervical vertebrae (commonly around C1–C4, though reported origins vary).
Insertion
Middle to lateral clavicle (most often the lateral third or half); may blend with nearby trapezius fibers.
Innervation
Branches of the cervical plexus, especially C3 and C4; reported variation involving nearby cervical spinal nerve branches.