Module 3 Muscles Flashcards by Tatum Erickson

Teres Major - Innervation

Lower subscapular nerve

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Teres major - Origin

Inferior angle & lower 1/3 of lateral border of the scapula

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Teres major - insertion

Crest of the lesser tubercle of the humerus

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Teres major - actions

EXTEND the glenohumeral joint
ADDUCT the glenohumeral joint
MEDIALLY ROTATE the glenohumeral joint

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Supraspinatus - Innervation

Suprascapular nerve

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Supraspinatus - origin

Supraspinous fossa of the scapula

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Supraspinatus - Insertion

Greater tubercle of the humerus

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Supraspinatus - Actions

ABDUCT the glenohumeral joint
STABILIZE the head of the humerus in the glenoid cavity

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Infraspinatus - Innervation

Suprascapular nerve

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Infraspinatus - origin

Infraspinous fossa of the scapula

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Infraspinatus - insertion

Greater tubercle of the humerus

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Infraspinatus - actions

LATERALLY ROTATE the glenohumeral joint
ADDUCT the glenohumeral joint

STABILIZE the head of the humerus in the glenoid cavity

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Teres Minor - Innervation

Axillary nerve

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Teres minor - origin

Upper 2/3 of lateral border of the scapula

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Teres minor - insertion

Greater tubercle of the humerus

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Teres minor - actions

LATERALLY ROTATE the glenohumeral joint
ADDUCT the glenohumeral joint

STABILIZE the head of the humerus in glenoid cavity

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Subscapularis - Innervation

Upper and lower subscapular nerves

Subscapularis - origin

Subscapular fossa of the scapula

Subscapularis - insertion

Lesser tubercle of the humerus

Subscapularis - Actions

MEDIALLY ROTATE the glenohumeral joint

STABILIZE the head of the humerus in glenoid cavity

Latissimus Doris - Innervation

Thoracodorsal nerve

Latissimus Doris - origin

Inferior angle of the scapula
Spinous processes of the last 6 thoracic vertebrae
Last 3 or 4 ribs
Thoracolumbar fascia
Posterior iliac crest

Latissimus Doris - insertion

Intertubercular groove of the humerus

Latissimus Doris - actions

EXTEND the glenohumeral joint
ADDUCT the glenohumeral joint
MEDIALLY ROTATE the glenohumeral joint

Deltoid - Innervation

Axillary nerve

Deltoid - origin

Lateral 1/3 of the clavicle, acromion and spine of the scapula

Deltoid - insertion

Deltoid tuberosity

Deltoid - actions

ALL: ABDUCT the glenohumeral joint ANTERIOR FIBRES: FLEX the glenohumeral joint MEDIALLY ROTATE the glenohumeral joint HORIZONTALLY ADDUCT the glenohumeral joint POSTERIOR FIBRES: EXTEND the glenohumeral joint LATERALLY ROTATE the glenohumeral joint HORIZONTALLY ABDUCT the glenohumeral joint

Biceps brachii - Innervation

Musculocutaneous nerve

Biceps brachii - origin

SHORT HEAD: Coracoid process of the scapula LONG HEAD: Supraglenoid tubercle of the scapula

Biceps brachii - actions

FLEX the humeroulnar joint (elbow) SUPINATE the radioulnar joint (forearm) FLEX the glenohumeral joint (shoulder)

Triceps brachii - Innervation

Radial nerve

Triceps brachii - origin

LONG HEAD: Infraglenoid tubercle of the scapula LATERAL HEAD: Posterior surface of proximal 1/2 of humerus MEDIAL HEAD: Posterior surface of distal 1/2 humerus

Triceps brachii - insertion

Olecranon process of the ulna

Triceps brachii - actions

ALL: EXTEND the humeroulnar joint LONG HEAD: EXTEND the glenohumeral joint ADDUCT the glenohumeral joint

Brachioradialis - Innervation

Radial nerve

Brachioradialis - origin

Proximal 2/3 of the lateral supracondylar ridge of the humerus

Brachioradialis - insertion

Styloid process of the radius

Brachioradialis - actions

FLEX the humeroulnar joint Assist to PRONATE and SUPINATE the humeroradial joints when these movements are resisted

Biceps Brachii - Insertion

- Tuberosity of the radius - aponeurosis of the biceps brachii