Mostly Shoulder Muscle O I A N Flashcards
Anterior Deltoid
O: Lateral 1/3 of clavicle
I: Deltoid Tuberosity
A: Flexion, Medial Rotation, Horizontal Adduction
N: Axillary
Middle Deltoid
O: Acromion
I: Deltoid Tuberosity
A: Abduction
N: Axillary
Posterior Deltoid
O: Scapular Spine
I: Deltoid Tuberosity
A: Extension, Lateral Rotation, Horizontal Abduction
N: Axillary
Trapezius, O I N
O: External Occipital Protuberance, Medial portion of Superior Nuchal Line of Occiput, Ligamentum Nuchae, Spinous Processes of C7-T-12
I: Lateral 1/3 of clavicle, acromion, and scapular spine
Trapezius: Upper, A
Bilaterally: Extend head and neck Unilaterally: Laterally flex head and neck to same side Rotate head and neck to opposite side Elevate scapula Upwardly rotate scapula
Trapezius: Middle, A
Adduct scapula
Stabilize scapula
Trapezius: Lower, A
Depress scapula
Upwardly rotate scapula
Latissimus Dorsi
O: Spinous process of T6-T12, last 3-4 ribs, thoracolumbar aponeurosis, posterior iliac crest
I: Lesser Tubercle
A: Extension, Adduction, Medial Rotation
N: Thoracodorsal
Teres Major - “Lat’s little helper”
O: Inferior angle and lower half of lateral scapular border
I: Lesser Tubercle
A: Extension, Adduction, Medial Rotation
N: Lower subscapular
Supraspinatus
O: Supraspinous fossa of scapula
I: Greater tubercle
A: Abduction, stabilization
N: Suprascapular
Infraspinatus
O: Infraspinous fossa
I: Greater tubercle
A: Lateral rotation, Adduction, Extension, Horizontal Abduction, stabilization of humeral head
N: Suprascapular
Teres Minor
O: Lateral border of Scapula
I: Greater tubercle
A: Lateral rotation, Adduction, Extension, Horizontal Abduction, stabilization
N: Axillary
Subscapularis
O: Subscapular fossa
I: Lesser tubercle
A: Medial Rotation, stabilization
N: Upper and Lower Subscapular
Rhomboid Major
O: Spinous processes of T2-T5
I: Medial border of scapula
A: Adduct scapula, Elevate scapula, Downward rotate scapula
N: Dorsal scapular
Rhomboid Minor
O: Spinous processes of C7-T1
I: Medial border of scapula
A: Adduct, elevate, downward rotate scapula
N: Dorsal scapular
Levator Scapula
O: Transverse processes of C1-C4
I: Medial border and Superior angle of scapula
A: Unilaterally: Elevate Scapula, downwardly rotate scapula, Laterally flex head/neck, Rotate head/neck to same side
Bilaterally: Extend head and neck
N: Dorsal scapular and cervical nerves
Serratus Anterior
O: Ribs 1-8 or 9
I: Anterior surface of medial border of scapula
A: With origin fixed - Abduct scapula, depress scapula, hold medial border of scapula against rib cage
With scapula fixed - May act in forced inhalation
N: Long Thoracic
Pectoralis Major
O: Medial half of clavicle, sternum , and cartilage of 1-6 ribs
I: Greater tubercle
N: Medial and Lateral Pectoral
Pec Major: All fibers, A
A: Adduction, medial rotation, assist in forced inhalation (if arm is fixed)
Pec Major: Upper Fibers, A
A: Flexion, Horizontal adduction
Pec Major: Lower Fibers, A
A: Extension
Pectoralis Minor
O: 3-5 ribs
I: Coracoid process
A: Depress scapula, Abduct scapula, Tilt scapula anterior
N: Medial Pectoral
Subclavius
O: First rib
I: Inferior, Lateral aspect of clavicle
A: Draw clavicle inferior and anterior, Elevate first rib, Stabilize sternoclavicular joint
N: Subclavian
Biceps Brachii
O: Short head - Coracoid process
Long head: Supraglenoid tubercle
I: Radial tuberosity and aponeurosis of biceps brachii
A: Elbow flexion, Supination, Shoulder flexion
N: Musculocutaneous
