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KH 2220 Laura Abbott, MS, LMT Day 6 Muscles of the Neck: SCM, Scalenes, Splenius Capitus, Splenius Cervicus, Suboccipitals Borders • Superior Border – Inferior border of mandible – Mastoid process of temporal bone (lateral) – External occipital protrudence (posterior) • Inferior Border – Jugular notch – Manubrium – Superior border of clavicle Bones • Hyoid Bone – – – – – – U-shaped Level of C3 Floating bone Styloid process of skull – superior to thyroid cartilage Stabilized by (above)suprahyoid and (below)infrahyoid muscles Provides muscle attachments to tongue and larynx Cartilages • Thyroid • Cricoid – trachea rings 1 and 2 ( C6 level) • Trachea rings • Lamina of thyroid cartilage produces laryngeal prominence (Adam’s Apple) Sternocleidomastoid (SCM) • O: Anterior and superior manubrium and superior medial third of clavicle • I: Lateral aspect of mastoid process and anterior half of superior nuchal line • A: – Unilaterally: laterally flexes head and neck to same side, rotates head to opposite side. – Bilaterally flexes neck, assists in inhalation. Anterior Scalenes – O: C3-C6 transverse processes – I: 1st ribs – A: • Unilaterally flexes head to same side when rib is fixed, rotates head to opposite side • Bilaterally elevates ribs during inhalation and flexes head and neck Posterior Scalenes – O: C4-C6 transverse processes – I: 2nd rib – A: • Unilaterally flexes head to same side when rib is fixed, rotates head to opposite side • Bilaterally elevates ribs during inhalation Medial Scalenes – O: C2-C7 transverse processes – I: 1st rib – A: • Unilaterally flexes head to same side when rib is fixed, rotates head to opposite side • Bilaterally elevates ribs during inhalation Splenius Capitus – O: spinous process of C7-T3 and ligament nuchae – I: superior nuchal line and mastoid process – A: • Unilaterally rotates head to same side and laterally flexes neck • Bilaterally extends head and neck Splenius Cervicus • O: Spinous processes and of T3-6 • I: Transverse processes of C1-3 • A: – Unilaterally rotates head to same side and laterally flexes neck – Bilaterally extends head and neck Levator Scapulae – O: TP of C1-C4 – I: superior angle of scapula – A: • Unilaterally elevates scapula, downwardly rotates scapula, laterally flexes neck • Bilaterally extends head and neck Suboccipitals • Rectus capitis posterior major • Rectus capitis posterior minor • Obliquus capitus inferior • Obliquus capitis superior