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Chapter

PEDS100 Chapter Notes -Latissimus Dorsi Muscle, Scapula, Deltoid Tuberosity


Department
Physical Education and Sport
Course Code
PEDS100
Professor
Gail Amort- Larson

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Muscles that Move the Arm
2 Muscles originate from axial skeleton: Pectoralis major and latissimus dorsi
7 muscles originate from scapula: Coracobrachialis, deltoid, supraspinatus,
infraspinatus, subscapularis, teres major, teres minor
Coracobrachialis: along with pectoralis major and latissimus dorsi adductors of
shoulder
O: Coracoid process
I: *Medial* margin of shaft of humerus
A: Adduction and flexion at shoulder
Deltoid:multi-pennate, opposite fibers do opposing actions in same muscle
O: Clavicle, acromion, and scapular spine
I: Deltoid tuberosity of humerus
A: Whole Muscle: abduction of shoulder; anterior fibers: flexion and medial
rotation of humerus; posterior fibers: extension and lateral rotation of humerus
Rotator Cuff : Supraspinatus, infraspinatus, teres minor, and subscapularis
(SITS) all but subscapularis originate from posterior side of scapula
Supraspinatus: most commonly injured part of shoulder, Can’t palpate
O: Supraspinous fossa of scapula
I: Greater tubercle of humerus
A: Initiates abduction at shoulder, first 20-30 degrees of abduction, then deltoid
abducts
Infraspinatus: can’t palpate
O: Infraspinous fossa of scapula
I: Greater tubercle of humerus
A: Laterally rotates humerus
Teres minor: can’t palpate
O: Lateral border of scapula
I: Greater tubercle of humerus
A: Lateral rotation
Subscapularis: serratus anterior+subscapularis are only 2 muscles that attach to
anterior side of scapula, can’t palpate
O: Subscapular fossa of scapula
I: Lesser tubercle of humerus
A: Medial rotation at shoulder
Teres major:
O: Inferior angle of scapula
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