neck and shoulder muscles moving the scapula and neck Flashcards
sternocleidomastoid origin and insertion
o - manubrium of sternum, medial 1/3 clavicle
i- mastoid process of temporal bone
sternocleidomastoid action
unilateral: ipsilateral side neck flexion, contralateral rotation
bilateral: neck flexion
anterior scalene origin and insertion
o - transverse processes C3-6
i - first rib
anterior scalene action
unilateral: ipsilateral side neck flexion
bilateral: flex neck
middle scalene origin and insertion
o - transverse processes C2-7
i - first rib
posterior scalene origin and insertion
o - transverse processes C5-7
i - second rib
middle and posterior scalenes action
ipsilateral side neck flexion
trapezius origin, insertion, innervation
o - occiput, spinous processes C7-T12
i - spine of scapula, clavicle, acromion
in - accessory N
trapezius action
superior fibres: elevate scapula
middle fibres: retract scapula
inferior fibres: depress scapula
superior and inferior: upward rotation
pectoralis minor origin, insertion, innervation
o - ribs 3-5
i - coracoid process
in - medial pectoral N
pectoralis minor action
protract and downward rotation scapula
rhomboids origin, insertion, innervation
o - spinous processes C7-T1, T2-T5
i - vertebral border of scapula (medial)
in - dorsal scapular N
rhomboids action
scapula:
-retract
-elevate
-downward rotation
serratus anterior origin, insertion, innervation
o - ribs 1-9
i - vertebral border of scapula (medial)
in - long thoracic N
serratus anterior action
protract scapula
