Muscles Quiz 2/Back and shoulder/Arm Flashcards
Deltoid Action
Abduction, flexion/extension, medial/lateral rotation
Deltoid Origin
The acromial end of the clavicle, the acromion process of the scapula, and the spine of the scapula
Deltoid Insertion
Deltoid tuberosity of the humerus
Deltoid Nerve Supply
Axillary Nerve (also sensory branch of the lateral shoulder)
Trapezius Action
Elevation/depression of scapula, and retraction of the scapula
Trapezius Origin
Occipital bone of the skull, cervical and thoracic vertebrae (C7-T12)
Trapezius Insertion
Posterior aspect of the clavicle, acromion process and spine of the scapula
Trapezius Nerve Supply
Accessory nerve
Latissimus Dorsi Action
Extends, adducts, and medially rotates the shoulder
Latissimus Dorsi Origin
Thoracic and lumbar vertebrae (T7-T12 and L1-L5), and the iliac crest of the ilium
Latissimus Dorsi Insertion
Intertubercular groove of the humerus
Latissimus Dorsi Nerve Supply
Thoracodorsal
Coracobrachialis Action
Shoulder flexion/adduction
Coracobrachialis Origin
Coracoid process of the scapula
Coracobrachialis Insertion
Humeral shaft (about 1/2 way down)
Coracobrachialis Nerve Supply
Musculocutaneous (sensory for the anterolateral forearm)
Supraspinatus Action
Abducts shoulder
Supraspinatus Origin
Supraspinous fossa of the scapula
Supraspinatus Insertion
Greater tubercle of the humerus
Supraspinatus Nerve supply
Suprascapular
Infraspinatus Origin
Infraspinous fossa of the scapula
Infraspinatus Action
Laterally rotates shoulder
Infraspinatus Insertion
Greater tubercle of the humerus
Infraspinatus Nerve supply
Suprascapular
Teres Minor Action
Laterally rotates shoulder
Teres Minor Origin
Lateral border of the scapula
Teres Minor Insertion
Greater tubercle of the humerus
Teres Minor nerve supply
Axillary
Subscapularis Action
Medially rotates shoulder
Subscapularis Origin
Subscapular fossa of the scapula
Subscapularis Insertion
Lesser tubercle of humerus
Subscapularis Nerve Supply
Upper and lower subscapular
Teres Major Action
Medially rotates shoulder
Teres Major Origin
Inferior angle of scapula
Teres Major Insertion
Intertubercular groove of the humerus
Teres Major Nerve Supply
Lower subscapular
Rhomboids (major and minor) Action
Elevates and retracts scapula
Rhomboids (major and minor) Origins
Cervical and thoracic vertebrae
Rhomboids (major and minor) Insertions
Medial border of the scapula
Rhomboids (major and minor) Nerve supply
Dorsal Scapular
Levator Scapulae Action
elevates and retracts the scapula
Levator Scapulae Origin
Cervical vertebrae
Levator Scapulae Insertions
Medial border of the scapula
Levator Scapulae Nerve Supply
Dorsal Scapular
Biceps Brachii Action
Flexes shoulder and elbow, supinates forearm
Biceps Brachii Origin
Short head: Coracoid process of scapula
Long head: Supraglenoid tubercle of the scapula
Biceps Brachii Insertion
Radial tuberosity of the radius
Biceps Brachii Nerve Supply
Musculocutaneous (sensory for the anterolateral forearm)
Brachialis Action
Flexes elbow
Brachialis Origin
Anterior shaft of the humerus
Brachialis Insertion
Coronoid process of ulna
Brachialis Nerve Supply
Musculocutaneous Nerve (sensory for the anterolateral forearm)
Triceps Brachii Action
Extends shoulder and elbow
Triceps Brachii Origin
Long head: infraglenoid tubercle of the scapula
Lateral/medial heads: Posterior shaft of the humerus
Triceps Brachii Insertion
Olecranon process of the ulna
Triceps Brachii Nerve Supply
Radial (posterior surface of arm and forearm, posterolateral surface of the hand)