Scapula Flashcards
Narrow rim of fibrocartilage around the edge of the glenoid cavity that slightly deepens and enlarges the glenoid cavity
Glenoid labrum
Articulation glenohumeral
Ball and socket
most freely moveable joint, least stable
Movement of the shoulder
Flexion Extension/Hyperextension Adduction/Abduction Inward/Outward rotation Horizontal flexion and extension
The shoulder is frequently injured due to anatomical design. What are the flaws in structure?
Shallowness of glenoid fossa
Laxity of ligamentous structures
Lack of strength and endurance in muscles
Muscles of the shoulder that do not originate on the scapula; example: Pectoralis major, Lattisimus dorsi
Extrinsic glenohumeral muscles
Originate on scapula and humerus; deltoid, coracobrachialis, teres major, rotator cuff group
Intrinsic glenohumeral muscles
Rotator cuff group
subscapularis
supraspinatus
infraspinatus
teres minor
Triangular(multipennate)
Anterior, mid, posterior
all parts insert on deltoid tuberosity
Deltoid
Deltoid(anterior) OIA
O: Outer 1/3 part of clavicle
I: Deltoid Tuberosity
A: Flexion, Adduction, Horizontal flexion
Deltoid(middle) OIA
O: Acromion process
I: Deltoid tuberosity
A: Abduction(strongest 90-180 degrees)
Deltoid(posterior) OIA
O: Spine of scapula
I: Deltoid tuberosity
A: Extension(hyper0
Without=difficulty putting hand in back pocket
Pectoralis major OIA
O: Sternum to inner 2/3 clavicle I: Outer lip of bicipital groove A1: Clavicular-flexion A2: Sternal-extension A1-2:Horiz flexion(synergy0 A: Inward rotation
Coroacobrachialis OIA
O: Coracoid process
I: Humerus
A: Weak shoulder flexion
Latissimus Dorsi OIA
O: Sacrum to lower thorasic V.(thorocolumbar fascia)
I: Inner lip bicipital groove(under axilla)
A: Extension, Adduction
A: Int Rot w/pectoralis major
Subscapularis OIA
O: Subscapular fossa
I: lesser tuberacle humerus
A: Internal(medial) rotation
