Scalenus anterior muscle

Dr Vijay et al.

The scalenus anterior (also known as anterior scalene) 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

Head and neck anatomy
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Article Information

rID: 12651
System: Head & Neck
Section: Anatomy
Tags: stub, refs, cases
Synonyms or Alternate Spellings:
  • Scalenus anterior
  • Anterior scalene muscle
  • Anterior scalene

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Cases and Figures

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    Figure 1: nerve to scalenes and levator scapulae
    Drag here to reorder.
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    Figure 2: cervical plexus labelled
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