Shoulder Joint Muscle OIAN Flashcards
Middle Deltoid
O: Acromion Process
I: Deltoid tuberosity
A: Shoulder Abduction
N: Axillary Nerve: C5, C6
Anterior Deltoid
O: Lateral 3rd of the clavicle
I: Deltoid tuberosity
A: shoulder abduction, flexion, medial rotation, horizontal addiction
N: Axillary Nerve C5-C6
Posterior Deltoid
O: Spine of Scapula
I: Deltoid tuberosity
A: Shoulder abduction, extension, hyperextension, lateral rotation, horizontal abduction
N: Axillary Nerve: C5, C6
Pectoralis Major Clavicular Portion
O: Medial 3rd of clavicle
I: Lateral lip of bicipital groove
A: Shoulder flexion (60*), shoulder adduction, medial rotation, horizontal adduction
N: Lateral & Medial Pectoral Nerve: C5-T1
Pectoralis Major Sternal Portion
O: Sternum, Costal cartilage of 1st 6 Ribs
I: Later lip of bicipital groove
A: Shoulder extension (60*), shoulder adduction, medial rotation, horizontal adduction
N: Lateral and Medial Pectoral Nerve: C5-T1
Latissimus Dorsi
O: Spinous process of T7-L5 (via dorsolumbar fascia) posterior surface of sacrum, iliac crest, & lower 3 ribs
I: Medial floor of bicipital groove
A: Shoulder ext, adduction, medial rotation, hyperextension
N: Thoracodorsal Nerve: C6-C8
Teres Major
O: Axillary border of scapula near inferior angle
I: Crest below lesser tubercle inferior to Lat’s attachment
A: Shoulder extension, adduction, medial rotation
N: Lower Subscapular Nerve: C5-C7
Supraspinatus
O: Supraspinous fossa
I: Greater tubercle
A: Shoulder abduction
N: Suprascapular Nerve: C5, C6
Infraspinatus
O: Infrspinous fossa
I: Greater tubercle
A: Shoulder lateral rotation, Horizontal abduction
N: Suprascapular Nerve: C5, C6
Teres Minor
O: Axillary border
I: Greater tubercle
A: Shoulder lateral rotation, Horizontal abduction
N: Axillary Nerve: C5, C6
Subscapularis
O: Subscapular fossa
I: Lesser tubercle
A: Shoulder medial rotation
N: Upper & Lower Subscapular Nerve: C5, C6
Coracobrachialis
O: Coracoid Process
I: Medial surface of humerus near midpoint
A: Stabilizes shoulder jt. assist w/ flex. and add.
N: Musculocutaneous: C6, C7