Shoulder joint Flashcards
Coracobrachialis
Origin - Coracoid process of the scapula
Insertion- Middle third of the medial aspect of the humerus
Action- Shoulder flexion, shoulder adduction
Innervation- musculocutaneous nerve
deltoid
Origin - Lateral third of the clavicle, acromion process of the scapula, spine of the scapula
Insertion- Deltoid tuberosity of the humerus
Action-
Anterior - adduction
Middle - Abduction of the arm
Posterior - rotation, extension, horizontal abduction
Innervation- Axillary nerve
Pectoralis major
Origin -
Clavicular head- medial half of clavicle
Sternal head - sternum and costal cartilage
Insertion- Lateral lip of the bicipital groove of the humerus
Action-
sternal - Adduction, medial rotation, and flexion of the humerus
clavicular head - flexion
Innervation- Medial pectoral nerve and lateral pectoral nerve
Supraspinatus
Origin - Supraspinous fossa of the scapula
Insertion- Greater tubercle of the humerus
Action- Abduction of the arm at the shoulder joint
Innervation- Suprascapular nerve
Infraspinatus
Origin - Infraspinous fossa of the scapula
Insertion- Greater tubercle of the humerus
Action- External rotation of the shoulder and horizontal abduction
Innervation- Suprascapular nerve
Teres minor
Origin - Posterior surface of the lateral border of the scapula
Insertion- Greater tubercle of the humerus
Action- External rotation of the arm, shoulder stabilization
Innervation- Axillary nerve
subscapularis
Origin - Subscapular fossa of the scapula
Insertion- Lesser tubercle of the humerus
Action- Internal rotation of the arm, stabilizes the shoulder joint
Innervation-Upper and lower subscapular nerves
Teres major
Origin - Posterior surface of the inferior angle of the scapula
Insertion- Medial lip of the bicipital groove of the humerus
Action- Adduction and medial rotation of the arm
Innervation- Lower subscapular nerve
Lattissimus dorsi
Origin - Spinous processes of lower thoracic and lumbar vertebrae, iliac crest, and inferior ribs.
Insertion- bicipital groove of the humerus.
Action- Extension, adduction, and medial rotation of the humerus.
Innervation-Thoracodorsal nerve
Biceps Brachii
Origin - Long head: Supraglenoid tubercle of the scapula
Short head: Coracoid process of the scapula
Insertion- Radial tuberosity of the radius
Action- Forearm flexion and supination
Innervation- Musculocutaneous nerve
Triceps brachii
Origin - Long head: Originates from the infraglenoid tubercle of the scapula
Lateral head: Originates from the posterior surface of the humerus, above the radial groove
Medial head: Originates from the posterior surface of the humerus, below the radial groove
Insertion- Olecranon of ulna
Action- extends the forearm at the elbow joint, helps stabilize the shoulder joint
Innervation- radial nerve
subclavius
Origin - First rib and its costal cartilage
Insertion- Inferior surface of the middle third of the clavicle
Action- Depression and stabilization of the clavicle
Innervation- Nerve to subclavius
