muscles of scapula/shoulder Flashcards
pec major
O: medial half of clavicle, manubrium and body of sternum and cartilages of first 6-7 ribs
I: crest of greater tubercle of humerus
A: flexion, IR, and horizontal adduction of shld. scapular protraction and depression
I: lateral pectoral
pec minor
O: ribs 2-5
I: medial border of coracoid process
A: downward rotation of scapula, scapular protraction and depression
I: medial pectoral
serratus anterior
O: ribs 1-8
I: medial border, costal surface of scapula
A: upward rotation of scapula, scapular protraction and depression
I: long thoracic
trapezius
O: superior nuchal line and external occipital protuberance, ligamentum nuchae, spinous processes and supraspinous ligs of C7-T12
I: Upper part: lateral 1/3 of clavicle
middle part: acromion and upper lip of spine of scapula
lower part: spine of scap
A: upper fibers - scap elevation
middle fibers - scap retraction
lower fibers - scap depression
upper and lower fibers - upward rotation of scap
I: cranial N XI (spinal accessory N)
rhomboid major and minor
O: ligamentous nuchae and spinous processes C7-T5
I: medial border of scapula
A: adduction, elevation, and downward rotation of scapula
I: dorsal scapular
levator scapulae
O: transverse processes C1-4
I: medial border of scapula between superior angle and root of spine (medial part of spine of scap)
A: scapular elevation and downward rotation
I: ventral rami of spinal nerves (c3-4) and dorsal scapular nerve
sternocleidomastoid
O: manubrium and medial portion of clavicle
I: mastoid process of temporal bone
A: U/L: same side flexion and opposite side rotation of neck
I: spinal accessory N (CN XI)
latissimus dorsi
O: spinous processes T7-12, through fascia from lumbar and sacral vertebrae, last 3/4 ribs and inferior angle of scapula
I: intertubercular groove of humerus
A: IR, adduction and extension of shoulder joint
I: thoracodorsal
deltoid
O: ant part: lateral end of clavicle
middle part: acromion
post part: spine of scap
I: deltoid tuberosity of humerus
A: abduct shoulder
ant fibers: flex shoulder
post fibers: extend shoulder
I: axillary
teres major
O: inf angle of scap
I: crest of lesser tubercle of humerus
A: shoulder IR, extension, adduction
I: lower subscapular
coracobrachialis
O: coracoid process of scapula
I: medial aspect of middle shaft of humerus
A: arm flexion
I: musculocutaneous
subscapularis
O: subscapular fossa of scapula
I: lesser tubercle of humerus
A: IR shoulder, adduct shoulder
I: upper and lower subscapular Ns
supraspinatus
O: supraspinous fossa of scapula
I: upper facet of greater tubercle of humerus
A: shoulder abduction up to 15deg
I: suprascapular
infraspinatus
O: infraspinous fossa of scapula
I: middle facet of greater tubercle of humerus
A: ER of shoulder
I: suprascapular
teres minor
O: lateral border of scapula
I: lower facet of greater tubercle of humerus
A: ER of shoulder
I: axillary
