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Levator Scapulae muscle Action : - Elevation of scapula - Lateral flexon of neck Origin - Transverse process of C1 - C4 Vertebrae Insertion : - Scapula Innervation : - Dorsal scapular nerve -Ventral rami of C3-C4 spinal nerves |
Scalene Action : - Anterior -Elevation of rib 1 -Lateral flexion and rotation of neck - Middle -Elevation of rib 1 -Lateral flexon of neck - Posterior -Elevation of rib 2 -Lateral flexion of neck Origin : - Transverse processes of C3-C7 Vertebrae |
Semispinalis capitis Action : - Unilateral : rotation of head to opposite side - Bilateral : Extension of head and neck Origin : - Transverse process of C7-T6 vertebrae Insertion : - Occipital bone Innervation : - Cervical spine nerves (dorsal rami) |
Splenius Capitis Action : - Unilateral : Rotation of head to same side - Bilateral : Extension of head and neck Origin : - Nuchal ligament - vertebra prominens (c7 spinous process) - spinous processes of T1-T3 vertebre Insertion : - Temporal bone (mastoid process) - Occipital one (superior nuchal line) Innervation : - Dorsal rami of c3-c5 spinal nerves |
Splenius cervicis Action : - Unilateral: rotation of head to same side - Bilateral : Extension of head and neck Origin : - Spinous processes of T3-T6 vertebrae Insertion : - transverse processes of C1 - C3 vertebrae Innervation : - Dorsal rami of C3-C5 spinal nerves |
Sternocleidomastiod Action : - Unilateral : Rotation of head so face turns to opposite side - Bilateral : Flexion of head Origin : - Clavicle (medial - Sternum (manubrium) Insertion : - mastoid process of temporal bone Innervation : - Accessory nerve (cranial nerve XI) |
Trapezius Action : - upper fibers : Elevation of scapula / medial rotation of scapula - Middle : Retraction of scapula - Lower : depression of scapula Origin : - Occipital bone / nuchal ligament / vertebra prominens / spinous process of t1 -t12 vertebrae Insertion : - clavicle / scapula Innervation : - Accessory nerve (cranial nerve XI) |