MSK Upper Limbs MOINA

DELTOID MUSCLE

Originates from clavicle, acromion process, and scapular spine

Inserts into deltoid tuberosity

Innervated by axillary nerve

Shoulder flexion & extension, arm abduction + medial rotation + lateral rotation

Clavicle, acromion process, and scapular spine

Origin of deltoid muscle

Deltoid Tuberosity

Insertion of deltoid muscle

Axillary Nerve

Innervates the deltoid muscle

Shoulder & elbow flexion, arm abduction + medial rotation + lateral rotation

Action of the deltoid muscle

LATISSIMUS DORSI

Originates from spinous processes of T7-L5, sacrum & iliac crest, inferior border of scapula

Inserts into medial crest of intertubercular groove

Innervated by thoracodorsal nerve

Shoulder extension, arm adduction + medial rotation

Spinous processes of T7-L5, sacrum & iliac crest, inferior border of scapula

Origin of latissimus dorsi muscle

Medial crest of intertubercular groove

Insertion of latissimus dorsi muscle

Thoracodorsal Nerve

Innervates the latissimus dorsi muscle

Shoulder extension, arm adduction + medial rotation

Action of latissimus dorsi muscle

PECTORALIS MAJOR

Originates from clavicle, sternum, superior 6 costal cartilages, and abdominal muscles

Inserts into lateral crest of intertubercular groove

Innervated by lateral and medial pectoral nerves

Shoulder flexion + extension (from flexing), arm adduction + medial rotation

Clavicle, sternum, superior 6 costal cartilages, and abdominal muscles

Origin of pectoralis major muscle

Lateral crest of intertubercular groove

Insertion of pectoralis major muscle

Lateral and medial pectoral nerves

Innervates the pectoralis major muscle

Shoulder flexion + extension (from flexing), arm adduction + medial rotation

Action of pectoralis major muscle

TERES MAJOR

Originates from lateral border of scapula

Inserts into medial crest of intertubercular groove

Innervated by lower subscapular nerve & C5 + C6

Shoulder extension, arm adduction + medial rotation

Lateral border of scapula

Origin of teres major muscle

Medial crest of intertubercular groove

Insertion of teres major muscle

Lower subscapular nerve & C5 + C6

Innervates teres major muscle

Shoulder extension, arm adduction + medial rotation

Action of teres major muscle

Infraspinatus, Supraspinatus, Subscapularis, Teres Minor

Rotator cuff muscles

INFRASPINATUS

Originates from infraspinous fossa of scapula

Inserts into greater tubercle of humerus

Innervated by suprascapular nerve & C5 + C6

Shoulder extension + stabilization, arm lateral rotation

Infraspinous fossa of the scapula

Origin of the infraspinatus muscle

Greater tubercle of humerus

Insertion of infraspinatus muscle

Suprascapular nerve & C5 + C6

Innervates infraspinatus muscle

Shoulder extension + stabilization, arm lateral rotation

Action of infraspinatus muscle

SUBSCAPULARIS

Originates from subscapular fossa of scapula

Inserts into lesser tubercle of humerus

Innervated by upper and lower subscapular nerves & C5 + C6

Shoulder extension + stabilization, arm medial rotation

Subscapular fossa of scapula

Origin of subscapularis muscle

Lesser tubercle of humerus

Insertion of subscapularis muscle

Upper and lower subscapular nerves & C5 + C6

Innervates subscapularis muscle

Shoulder extension + stabilization, arm medial rotation

Action of subscapularis muscle

SUPRASPINATUS

Originates from supraspinous fossa of scapula

Inserts into greater tubercle of humerus

Innervated by subscapular nerve & C5 + C6

Shoulder stabilization, arm abduction

Supraspinous fossa of scapula

Origin of supraspinatus muscle

Greater tubercle of humerus

Insertion of supraspinatus muscle

Subscapular nerve & C5 + C6

Innervates supraspinatus muscle

Shoulder stabilization, arm abduction

Action of supraspinatus muscle

TERES MINOR

Originates from lateral border of scapula

Inserts into greater tubercle of humerus

Innervated by axillary nerve & C5 + C6

Shoulder extension + stabilization, arm adduction + lateral rotation

Lateral border of scapula

Origin of teres minor muscle

Greater tubercle of humerus

Insertion of teres minor muscle

Axillary nerve & C5 + C6

Innervates teres minor muscle

Shoulder extension + stabilization, arm adduction + lateral rotation

Action of teres minor muscle

CORACOBRACHIALIS

Originates from coracoid process of scapula

Inserts into midshaft of humerus

Innervated by musculocutaneous nerve

Shoulder flexion, arm adduction

Coracoid process of scapula

Origin of coracobrachialis muscle

Midshaft of humerus

Insertion of coracobrachialis muscle

Musculocutaneous Nerve

Innervates coracobrachialis muscle

Shoulder flexion, arm adduction

Action of coracobrachialis muscle

LEVATOR SCAPULAE

Originates from transverse processes of C1-C4

Inserts into superior angle of scapula

Innervated by dorsal scapular nerve

Scapular elevation + retraction + rotation, neck lateral flexion

Transverse processes of C1-C4

Origin of levator scapulae muscle

Superior angle of scapula

Insertion of levator scapulae muscle

Dorsal scapular nerve

Innervates levator scapulae muscle

Scapular elevation + rotation, retraction, neck lateral flexion

Action of levator scapulae muscle

PECTORALIS MINOR

Originates from ribs 3-5

Inserts into coracoid process of scapula

Innervated by medial pectoral nerve

Scapular depression, ribs elevation

Ribs 3-5

Origin of pectoralis minor muscle

Coracoid process of scapula

Insertion of pectoralis minor muscle

Medial pectoral nerve

Innervates pectoralis minor muscle

Scapular depression, ribs elevation

Action of pectoralis minor muscle

RHOMBOID MAJOR

Originates from spinous processes of T1-T4

Inserts into medial border of scapula

Innervated by dorsal scapular nerve

Scapular retraction, rotation, and fixing

Spinous processes of T1-T4

Origin of rhomboid major muscle

Medial border of scapula

Insertion of rhomboid major muscle

Dorsal scapular nerve

Innervates rhomboid major muscle

Scapular retraction, rotation, and fixing

Action of rhomboid major

RHOMBOID MINOR

Originates from spinous processes of T1-T4

Inserts into medial border of scapula

Innervated by dorsal scapular nerve

Scapular retraction, slight elevation. rotation, and fixing

Spinous processes of T1-T4

Origin of rhomboid minor muscle

Medial border of scapula

Insertion of rhomboid minor muscle

Dorsal scapular nerve

Innervates rhomboid minor muscle

Scapular retraction, slight elevation, rotation, fixing

Actions of rhomboid minor muscle

SERRATUS ANTERIOR

Originates from ribs 1-9

Inserts into medial border of scapula

Innervated by long thoracic nerve

Scapular rotation + protraction, ribs elevation

Ribs 1-9

Origin of serratus anterior muscle

Medial border of scapula

Insertion of serratus anterior muscle

Long thoracic nerve

Innervates serratus anterior muscle

Scapular rotation + protraction, ribs elevation

Action of serratus anterior muscle

TRAPEZIUS