Scalenus anterior muscle

Last revised by Dr Daniel J Bell on 16 May 2021

The scalenus anterior (also known as anterior scalene) muscle is a neck muscle and known as the "key" structure for the thoracic inlet as it is an important anatomical landmark.

Summary

  • origin: transverse processes of 3rd to 6th cervical vertebrae
  • insertion: inner border of first rib (scalene tubercle)
  • blood supply: ascending cervical artery
  • innervation: ventral rami of cervical nerves (C4, C5 and C6) from the cervical plexus and occasionally C3
  • action
    • raises first rib (inspiration)
    • adjunct: neck rotation/flexion
  • note: this muscle is covered by prevertebral fascia

Gross anatomy

Relations

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Cases and figures

  • Figure 1: nerve to scalenes and levator scapulae
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  • Figure 2: cervical plexus labeled
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  • Figure 3: deep neck muscles (Gray's illustration)
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