muscles of the shoulder Flashcards
trapezius action
superior = elevation of scapula
middle = retraction
inferior = depresses scapula
- scapula rotation = abduction and adduction
trapezius innervation
accessory nerve - no brachial plexus
levator scapularis action
elevates scapula
levator scapularis innervation
dorsal scapular nerve - cervical plexus
rhomboid minor/major action
retraction of scapula
rotate glenoid cavity
rhomboid minor/major innervation
dorsal scapula nerve
serratus anterior action
twist, lift and punch action
serratus anterior innervation
long thoracic nerve
pectoralis minor action
protraction and depression of scapula
pectoralis minor innervation
medial pectoral nerve
deltoid action
abduction of arm
medial and lateral rotation of arm
aids flexion with pec maj
aids extension with lat dorsi
deltoid innervation
axillary nerve
latissimus dorsi action
extension
abduction
medial rotation
latissimus dorsi innervation
thoracodorsal nerve
rotator cuff muscles
Supraspinatus
Infraspinatus
Teres minor
Subscapularis
supraspinatus action
supports glenohumeral joint (closer)
abduction
lateral rotation
supraspinatus innervation
suprascapular nerve
infraspinatus action
supports glenohumeral joint (brace)
lateral rotation
infraspinatus innervation
suprascapular nerve
teres minor insertion
inserts at greater tubercle of humerus
teres minor action
lateral rotation
supports glenohumeral joint
teres minor innervation
axillary nerve
teres major insertion
intertubercular groove of humerus
teres major action
extension of arm
adduction
medial rotation
teres major innervation
lower subscapular nerve
subscapularis action
supports glenohumeral joint
medial rotation
adduction
subscapularis innervation
upper/lower subscapular nerves
pectoralis major action
supports glenohumeral joint
medal rotation
adduction
pectoralis major innervation
med/lat pectoral nerves
factors stabilising glenohumeral joint
glenoid labrum = fibrous lip round socket = bigger
tendon of biceps brachii = goes up through cavity
fibrous joint capsule
rotator cuff muscles
rotator cuff muscles
Supraspinatus
Infraspinatus
Teres minor
Subscapularis