Muscles Of The Neck 1

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Muscles Of The Neck 1

  1. 1. Sterno-cleidomastoid muscle • Origin: upper border of manubrium sterni and medial third of upper surface of clavicle. • Insertion: mastoid process and lateral third of superior nuchal line. • Nerve supply: Spinal accessory nerve (motor) and C 2,3 (proprioceptive). • Action: • Both muscles extend the atlanto-occipital joint and flex the other cervical intervertebral joints. • One muscle turns the head to make the face looks upward and to the opposite side. • On fixation of the insertion, the muscle act as accessory muscle of inspiration.
  2. 2. Trapezius muscle • Origin: Medial third of superior nuchal line, external occipital protuberance, ligamentum nuchae, 7th cervical spine all the thoracic spines. • Insertion: lateral third of clavicle, acromion process and spine of scapula. • Nerve supply: Spinal accessory nerve (motor) and C3,4 (proprioceptive). • Action: • muscles extend the neck. • Upper fibers of one side lateral flex the neck. • Upper fibers elevate the shoulder. • Middle fibers retract the shoulder. • Lower fibers depress the shoulder.
  3. 3. Platysma muscle • Origin: deep fascia of the upper part of thorax (covering pectoralis major and deltoid). • Insertion: lower border of the mandible. Mentalis Depressor labii inferioris Depressor anguli oris • Nerve supply: Cervical branch of facial nerve. • Action: Depression of the mandible.
  4. 4. Splenius capitis muscle • Origin: 1. Lower part of ligamentum nuchae. 2. Upper four thoracic spines. • Insertion: mastoid process and outer part of superior nuchal line. • Nerve supply: segmental innervation from the dorsal rami of spinal nerves • Action: Extension of the neck.
  5. 5. Levator scapulae muscle • Origin: Transverse processes of upper four cervical vertebrae. • Insertion: Upper part of medial border of scapula. • Nerve supply: C3,4 and dorsal scapular nerve (C5). • Action: Elevation of scapula.
  6. 6. Scalenus medius muscle • Origin: Transverse processes of lower six cervical vertebrae (2-7). • Insertion: Upper surface of the first rib. • Nerve supply: Segmental from the ventral rami of cervical nerves. • Action: Elevation of first rib and lateral flexion the neck.
  7. 7. Scalenus anterior muscle • Origin: Transverse processes of typical cervical vertebrae (3- 6). • Insertion: Scalene tubercle of the first rib. • Nerve supply: Segmental from the ventral rami of 4th, 5th and 6th cervical nerves. • Action: Elevation of first rib and lateral flexion the neck.

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