Muscles of Scapular and Deltoid Region MT Flashcards
Subscapularis origin
Subscapular fossa
Subscapularis insertion
lesser tubercle of the humerus
subscapularis innervation
upper and lower subscapular nerves
Subscapularis action
Medial rotation of the arm
supraspinatus origin
supraspinous fossa
supraspinatus insertion
greater tubercle of the humerus (superior facet)
supraspinatus innervation
Suprascapular nerve (C5-C6)
Supraspinatus action
abduction 0-15 degrees
Infraspinatus origin
infraspinatus fossa
infraspinatus insertion
greater tubercle of the humerus (middle facet)
infraspinatus innervation
suprascapular nerve (C5-C6)
infraspinatus action
Lateral rotation of the arm
Teres Minor origin
upper lateral border of the scapula
Teres minor insertion
greater tubercle of the humerus (inferior facet)
teres minor innervation
axillary nerve (C5-C6)
teres minor action
lateral rotation of the arm
Teres major origin
lower lateral border of the scapula
teres major insertion
crest of the lesser tubercle of the humerus
teres major innervation
lower subscapular nerve
teres major action
medial rotation, adduction and extention of arm
Deltoid origin
lateral margin of the scapular spine, acromion, and clavicle
deltoid insertion
deltoid tuberosity of the humerus
deltoid innervation
axillary nerve (C5-C6)
deltoid action
abduction 15-100 degrees, ant. fibers medial rotation and flexion of the arm, post. fibers lateral rotation, and extention of the arm
Pectoralis Major origin
clavicle, sternum and ribs 1-6
Pectoralis major insertion
crest of the greater tubercle of the humerus
pectoralis major innervation
medial and lateral pectoral nerves
pectoralis major action
medial rotation, adduction and flexion of the arm
Pectoralis minor origin
ribs 3-5
pectoralis minor insertion
coracoid process of the scapula
pectoralis minor innervation
medial pectoral nerve
pectoralis minor action
protraction of the scapula
serratus anterior origin
ribs 1-9
serratus anterior insertion
medial border of the scapula
costal surface
serratus anterior innervation
long thoracic nerve (C5-C7)
serratus anterior action
protraction and superior rotation of the lateral angle of the scapula
holds scapula against the dorsal trunk