Muscle Origin, Insertion, Actions, Innervations

Biceps Brachii Muscle Origin

(Short head) coracoid process of the scapula; (long head) supraglenoid tubercle of the scapula.

Scapulohumeral Intrinsic Shoulder Muscles

- Deltoid Muscle - Teres major muscle - Teres minor muscle - Supraspinatus muscle - Infraspinatus muscle - Subscapularis muscle

Axioappendicular Extrinsic Shoulder Muscles Deep

- Levator Scapulae Muscle - Rhomboid Major Muscle - Rhomboid Minor Muscle

Posterior Axioappendicular Extrinsic Shoulder Muscles Superficial

- Trapezius Muscle - Latissimus Dorsi Muscle

Teres Major Muscle Action

Adducts and medially rotates arm.

Subclavius Muscle Origin

Junction of rib and costal cartilage 1.

Pectoralis Minor Muscle Action

Stabilizes scapula.

Subscapularis Muscle Origin

Subscapular fossa of scapula.

Latissimus Dorsi Muscle Innervation

Thoracodorsal nerve.

Pectoralis Major Muscle Action

Adducts and medially rotates humerus.

Subclavius Muscle Action

Anchors and depresses clavicle.

Pectoralis Major Muscle Origin

Anterior medial clavicle (clavicular head); anterior sternum costal cartilages 1-6 (sternocostal head).

Serratus Anterior Muscle Insertion

Anterior surface of medial border of scapula.

Deltoid Muscle Action

Anterior: Flexes and medially rotates arm. Posterior: Extends and laterally rotates arm.

Deltoid Muscle Innervation

Axillary Nerve

Teres Minor Muscle Innervation

Axillary Nerve.

Pectoralis Minor Muscle Insertion

Coracoid process of scapula.

Coracobrachialis Muscle Origin

Coracoid process.

Brachialis Muscle Insertion

Coronoid process and ulnar tuberosity.

Deltoid Muscle Insertion

Deltoid tuberosity of humerus.

Brachialis Muscle Origin

Distal half of anterior humerus.

Levator Scapulae Muscle Innervation

Dorsal scapular nerve.

Rhomboid Major Muscle Innervation

Dorsal scapular nerve.

Rhomboid Minor Muscle Innervation

Dorsal scapular nerve.

Levator Scapulae Muscle Action

Elevates and downwardly rotates scapula.

Latissimus Dorsi Muscle Action

Extends, adducts, medially rotates humerus, and raises body toward arms.

Serratus Anterior Muscle Origin

External and lateral surfaces of ribs 1-8/9.

Trapezius Muscle Origin

External occipital protuberance, nuchal ligament, and spinous processes of C7-T12.

Brachialis Muscle Action

Flexes forearm.

Coracobrachialis Muscle Action

Helps flex and adduct arm, resists dislocation of shoulder.

Subclavius Muscle Insertion

Inferior surface of middle 1/3 of clavicle.

Teres Minor Muscle Insertion

Inferior, posterior surface of greater tubercle of humerus.

Triceps Brachii Muscle Origin Long head

Infraglenoid tubercle of scapula.

Infraspinatus Muscle Origin

Infraspinous fossa of scapula.

Supraspinatus Muscle Action

Initiates and assists deltoid in arm abduction, holds the humeral head in glenoid.

Latissimus Dorsi Muscle Insertion

Intertubercular Sulcus of humerus.

Pectoralis Major Muscle Innervation

Lateral and medial pectoral nerves.

Pectoralis Major Muscle Insertion

Lateral lip of intertubercular sulcus on humerus.

Deltoid Muscle Origin

Lateral third of clavicle, acromion and spine of scapula.

Trapezius Muscle Insertion

Lateral third of clavicle, acromion and spine of scapula.

Infraspinatus Muscle Action

Laterally rotates arm, and holds humeral head in glenoid.

Teres Minor Muscle Action

Laterally rotates arm, and holds humeral head in glenoid.

Subscapularis Muscle Insertion

Lesser tubercle of humerus.

Subacromial Bursa

Located between the acromion process, coracoacromial ligament, deltoid muscle, and supraspinatus tendon

Serratus Anterior Muscle Innervation

Long thoracic nerve.

Teres Major Muscle Innervation

Lower subscapular nerve.

Triceps Brachii Muscle Action

Main extensor of forearm, long head resists posterior dislocation of humerus.

Rhomboid Major Muscle Insertion

Medial border of scapula from level of spine to inferior angle.

Levator Scapulae Muscle Insertion

Medial border of scapula superior to scapular spine.

Rhomboid Minor Muscle Insertion

Medial end of scapular spine.

Teres Major Muscle Insertion

Medial lip of intertubercular sulcus of humerus.

Pectoralis Minor Muscle Innervation

Medial pectoral nerve.

Subscapularis Muscle Action

Medially rotates arm, and helps hold humeral head in glenoid.

Teres Minor Muscle Origin

Middle part of lateral border of scapula.

Coracobrachialis Muscle Insertion

Middle third of medial surface of humerus.

Infraspinatus Muscle Insertion

Middle, posterior surface of greater tubercle of humerus.

Brachialis Muscle Innervation

Musculocutaneous Nerve.

Corachobrachialis Muscle Innervation

Musculocutaneous Nerve.

Biceps Brachii Muscle Innervation

Musculocutaneous nerve.

Subclavius Muscle Innervation

Nerve to subclavius.

Rhomboid Minor Muscle Origin

Nuchal ligament, spinous processes of C7 and T1 vertebrae.

Triceps Brachii Muscle Insertion

Olecranon process of ulna.

Triceps Brachii Muscle Origin Medial head

Posterior surface of humerus, inferior to radial groove.

Triceps Brachii Muscle Origin Lateral head

Posterior surface of humerus, superior to radial groove.

Teres Major Muscle Origin

Posterior surface of inferior angle of scapula.

Levator Scapulae Muscle Origin

Posterior tubercles of transverse processes of C1-C4 vertebrae.

Serratus Anterior Muscle Action

Protracts and rotates scapula, holds scapula against thoracic wall.

Triceps Brachii Muscle Innervation

Radial Nerve

Biceps Brachii Muscle Insertion

Radial tuberosity.

Rhomboid Major Muscle Action

Retract and downwardly rotate scapula.

Rhomboid Minor Muscle Action

Retract scapula and downwardly rotate.

Pectoralis Minor Muscle Origin

Ribs 3-5.

Trapezius Muscle Innervation

Spinal accessory n. (CN XI)

Rhomboid major Muscle Origin

Spinous processes of T2-T5 vertebrae.

Latissimus Dorsi Muscle Origin

Spinous processes of inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest.

Supraspinatus Muscle Insertion

Superior part of greater tubercle of humerus.

Biceps Brachii Muscle Action

Supinates and flexes forearm.

Infraspinatus Muscle Innervation

Suprascapular nerve.

Supraspinatus Muscle Innervation

Suprascapular nerve.

Supraspinatus Muscle Origin

Supraspinous fossa of scapula.

Subscapularis Muscle Innervation

Upper and lower subscapular nerves.

Trapezius Muscle Action

Upper fibers (1) elevate scapula; lower fibers (3) depress scapula; middle fibers (2) retract scapula; upwardly rotate scapula.