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Masseter origin
zygomatic arch
Masseter insertion
Angle and ramus of mandible
Masseter actions
elevates and protrudes mandible
Splenius origin
Spinous process of cervical and thoracic vertebrae
Splenius insertion
Mastoid process of temporal bone and occipital bone
Splenius actions
Extension/hyperextension of neck, R/L rotation of head at neck, lateral flexion of head at neck
Sternocleidomastoid origin
Sternal end of clavicle and manubrium of sternum
Sternocleidomastoid insertion
Mastoid process of temporal bone
Sternocleidomastoid actions
Laterally flexes head at neck, R/L rotation of head at neck
Pectoralis minor origin
Ribs
Pectoralis minor insertion
Coracoid process of scapula
Pectoralis minor actions
Protracts scapula at shoulder and downward rotation of scapula
Trapezius origins
Occipital bones and spinous processes of thoracic vertebrae
Trapezius insertions
Clavicle, acromion of scapula, spine of scapula
Trapezius actions
Shrug, retract, depress scapula at shoulder and extend/hyperextends head at neck
Rhomboids origins
Spinous processes of thoracic and cervical vertebra
Rhomboids insertion
Medial border of scapula
Rhomboids actions
Retracts scapula at shoulder (adducts, shifts scapula towards midline)
Serratus anterior origin
anterior and superior margin of ribs
Serratus anterior insertion
anterior surface of scapula
Serratus anterior actions
Protracts scapula at shoulder and upward rotation of scapula (raising arms above head)
Deltoid origins
Clavicle and acromion and spine of scapula
Deltoid insertion
Deltoid tuberosity of humerus
Deltoid actions
Abduction of arm at shoulder, flexion of arm at shoulder, extension of arm at shoulder, lateral/medial rotation of arm at shoulder
Supraspinatus origins
Supraspinous fossa of scapula
Supraspinatus insertion
greater tubercle of humerus
Supraspinatus action
Abduction of arm at shoulder