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Scalenus Anterior Muscle

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The Scalenus Anterior Muscle is a key structure in the lower neck that lies deep to the sternocleidomastoid muscle. It originates from the anterior tubercles of the C3-C6 transverse processes and inserts on the scalene tubercle on the inner border of the first rib.

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Scalenus Anterior Muscle PPT Summary

  1. The scalene anterior muscle is located deep to the sternocleidomastoid muscle in the lower neck and is responsible for elevating the first rib and bending the neck on the same side.
  2. The muscle originates from the anterior tubercles of the C3-C6 transverse processes and inserts on the scalene tubercle on the inner border of the first rib.
  3. The triangle of the vertebral artery is a triangular interval between the scalene anterior muscle, the longus colli muscle, and the subclavian artery. It contains the vertebral artery, the sympathetic trunk with associated ganglia, the common carotid artery, and the carotid sheath.
  4. The scalene anterior muscle is innervated by the anterior primary rami of the C3, C4, and C5 spinal nerves.
  5. The proximity of the scalene anterior muscle to the brachial plexus, subclavian artery, and vein can give rise to compression syndromes.

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