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

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Medical Sciences

actions of these muscles .

muscle                        origin                                          insertion                    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:

Answer & Explanation Solved by verified expert
3.8 Ratings (341 Votes)
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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