actions of these muscles muscleorigininsertion action Sternocleidoma...

actions of these muscles . muscleÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â origin Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â insertionÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â action Sternocleidomastoid Manubrium and medial portion of clavicle When both contract: When one contracts: Erector...

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actions of these muscles .
muscleÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â originÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â insertionÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â action
Sternocleidomastoid
Manubrium and medial portion of clavicle
When both contract:
When one contracts:
Erector Spinae
Serratus Anterior
Pectoralis major
Clavicle, sternum, and costal cartilage of first six ribs
deltoid
Lateral third of clavicle; acromion and spine of scapula
Trapezius
Occipital protuberance and spinous processes of C7 thru T12
Action on scapula:
When scapula is fixed:

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MUSCLE NAME ORIGIN INSERTION ACTION STERNOCLEIDO MASTOID The manubrium and medial portion of the clavicle Mastoid process of the temporal bone superior nuchal line WHEN ONE CONTRACT contralateral cervical rotation ipsilateral cervical flexion WHEN BOTH CONTRACT cervical flexion the elevation of the sternum and assists in See Answer

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Sternocleidomastoid	Manubrium and medial portion of clavicle	When both contract: When one contracts:
Erector Spinae
Serratus Anterior
Pectoralis major	Clavicle, sternum, and costal cartilage of first six ribs
deltoid	Lateral third of clavicle; acromion and spine of scapula
Trapezius	Occipital protuberance and spinous processes of C7 thru T12	Action on scapula: When scapula is fixed: