Anatomy study note · Head and neck

Scalenus medius and posterior

Deep lateral neck muscles behind scalenus anterior.

Key points

• Medius → 1st rib; posterior → 2nd rib.
• Cervical anterior rami.
• Medius forms the back of the interscalene triangle.
• Ventral-ramus neck muscles: ventral parts of cervical myotomes.
• Trunk muscles: from myotomes of the somites.
• Skeletal muscle: multinucleated, peripheral nuclei, striated.
• Epimysium → perimysium → endomysium.

The full note in the atlas also covers

Origin · Insertion · Action · Nerve supply · Histology · Development

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 12, PDF pp. 1616–1617, 1626
• Inderbir Singh’s Human Embryology, ch. 7, PDF pp. 108–109
• BRS Cell Biology & Histology, 7th ed., ch. 8, PDF pp. 135–144

More from the head and neck

• Sclera
• Skull
• Sphenoid bone
• Sternocleidomastoid
• Sternohyoid
• Sternothyroid
• Stylohyoid
• Stylopharyngeus
• Subclavian artery
• Subclavian vein
• Sublingual gland
• Submandibular gland

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