Spine - Neck Muscles Flashcards
What is the difference btw a global mover and a local stabilizer?
A global mover generate torque and range of movement while local stabilizers are deeper muscles that control segmental movements of the spine
What are the origins and insertions of the superficial (and one deep) anterior neck muscles?
Platysma - Origin @ pectoral fascia and inserts @ the mandible
Action: Tenses skin of the neck; depresses mandible
Sternal Head of Sternocleidomastoid - Origin @ the sternum and inserts @ the mastoid process
Clavicular Head of Sternocleidomastoid - Origin @ the clavicle and inserts @ the mastoid process
Action: Flexes, laterally flexes, and CONTRALATERALLY rotates neck
Longus Colli - Origin @ the anterior aspects of C3-T3 vertebrae and inserts on the anterior aspects of C1-C6 vertebrae (several segments and bundles)
Action: Flexes neck and rotates neck at the cervical vertebral joints (ipsilateral)
Longus Capitis - Origin @ the anterior tubercles of transverse processes of C3-C6 and inserts @ the basilar part of the occipital bone
Action: Weak neck flexor
What are the lateral neck muscles? Os and Is? Actions?
Scalenus Anterior - Origin @ the anterior tubercles of transverse processes C3-C6 vertebrae and inserts @ the scalene tubercle of the 1st rib
Action: Flexes, contralaterally rotates, and laterally flexes neck; elevates first rib
Scalenus Medius - Origin @ the transverse processes of C2-C7 vertebrae and inserts @ the superior surface of the first rib
Action: Laterally flexes and elevates the first rib
Scalenus Posterior - Origin @ the posterior tubercles of the transverse processes of C4-C6 vertebrae and inserts @ the external surface of the second rib
Action: Laterally flexes and elevates second rib
What are the origins, insertions, actions of the superficial posterior neck muscles?
Upper Trapezius - Origin @ the base of the skull, occiptial protuberance, and posterior ligaments of the neck. Inserts @ the posterior aspect of the lateral 3rd of the clavicle
Action: Extends and laterally flexes neck, contralateral rotation
Splenius Capitis - Origin @ the nuchal ligament and spinous processes of C7-T3 vertebrae and inserts @ the mastoid process and occipital bone
Action: Ipsilaterally rotates and extends neck
Splenius Colli (cervicis) - Origin @ the spinous processes of T3-T6 and inserts @ transverse processes of C1-C3 vertebrae
Action: Ipsilaterally rotates, laterally flexes the neck at the cervical vertebral joint and extends neck
Levator scapulae - Origin @ the transverse processes of C1-C@ vertebrae and posterior tubercles of transverse processes of C3-C4 vertebrae. Inserts @ the superior angle of the scapula, medial border
Action: Extends and laterally flexes the neck at the cervical vertebral joints
What are the origins and insertions and actions of the deep posterior neck muscles?
Semispinalis Capitis - Origin @ C4-T6 vertebrae and inserts @ the occipital bone
Action: Extends and contralaterally rotates the head (small contributor)
Semispinalis Colli (Cervicis) - Origin @ the transverse processes of T1-T6 vertebrae and inserts @ spinous processes of C2-C5 vertebrae
Action: Extends and contralaterally rotates the head @ the cervical vertebral joints (also maintains curvature of the spine and stability of the spinal column)
