Origins & Insertions Flashcards
Pectoralis Major
Clavicular Head
O: Anterior surface of medial half of clavicle
I: Intertubercular sulcus of humerus
Sternocostal head:
O: anterior surface of sternum, superior 6 costal cartilages, aponeurosis of external oblique
I: Intertubercular sulcus of humerus
Pectoralis minor
O: 3rd and 5th ribs near costal cartilages
I: Medial border and superior surface of coracoid process of scapula
Serratus anterior
O: External surfaces of lateral parts of 1st-8th ribs
I: Anterior surface of medial border of scapula
Trapezius
O: Medial third of superior nuchal line; external occipital protuberance; nuchal ligment; spinous processes of C7-T12 vertebrae
I: Lateral third of clavicle; acromion and spine of scapula
Latissimus dorsi
O: Spinous processes of T7-T12; thoracolumbar fascia, iliac crest, inferior 3-4 ribs
I: Intertubercular sulcus of humerus
Levator scapulae
O: Transverse processes of C1-C4
I: Medial border of scapula (superior to root of scap spine)
Rhomboid major
O: Spinous processes of T2-T5
I: Medial border of scapula (from level of spine to inferior angle)
Deltoid
O: Lateral third of clavicle; acromion and spine of scapula
I: Deltoid tuberosity of the humerus
Supraspinatus
O: Supraspinous fossa of scapula
I: Greater tubercle of the humerus
Infraspinatus
O: Infraspinatus fossa of scapula
I: Greater tubercle of the humerus
Subscapularis
O: Subscapular fossa
I: Lesser tubercle of humerus
Teres major
O: Posterior surface of inferior angle of scapula
I: Greater tubercle of humerus
Biceps brachii
O: Short head: tip of coracoid process; Long head: supraglenoid tubercle of humerus
I: Tuberosity of radius and bicipital aponeurosis
Brachialis
O: Distal half of anterior surface of humerus
I: Coronoid process and tuberosity of ulna
Coracobrachialis
O: Tip of coracoid process
I: Middle third of lateral surface of the humerus
Triceps brachii
O: Long head: infraglenoid tubercle of scapula; Lateral head: posterior surface of humerus superior to radial groove; Medial head: posterior surface of humerus inferior to radial groove
I: Proximal end of olecranon of ulna and fascia of forearm
Pronator teres
O: Ulnar head: coronoid process; Humeral head: common flexor origin
I: Middle convexity of lateral surface of radius
Flexor carpi radialis (FCR)
O: Common flexor origin
I: Base of 2nd metacarpal
Palmaris longus
O: Common flexor origin
I: Distal half of flexor retinaculum, apex of palmar aponeurosis
Flexor carpi ulnaris (FCU)
O: Humeral head: common flexor origin; Ulnar head: olecranon and posterior border of ulna
I: Pisiform, hook of hamate, 5th metacarpal
Extensor digitorum
O: Common extensor origin
I: Extensor expansions of medial 4 digits
Extensor carpi ulnaris (ECU)
O: Common extensor origin and posterior border of ulna
I: Dorsal aspect of base of 5th metacarpal
Extensor pollicis longus
O: Posterior surface of middle third of ulna and interosseus membrane
I: Dorsal aspect of base of distal phalanx of thumb
Extensor indicis
O: Posterior surface of distal third of ulna and interosseus membrane
I: Extensor expansion of 2nd digit.
Extensor carpi radialis longus
O: Lateral supra epicondylar ridge of humerus
I: Dorsal aspect of base of 2nd metacarpal
Abductor pollicis brevis
O: Scaphoid and trapezium, flexor retinaculum
I: Base of proximal phalanx of the thumb
Adductor pollicis
O: Transverse head: palmar surface of 3rd metacarpal; Oblique head: capitate bone, bases of 2nd and 3rd metacarpals
I: Base of proximal phalanx of thumb
Flexor pollicis brevis
O: Scaphoid and trapezium, flexor retinaculum
I: Base of proximal phalanx of thumb
Opponens pollicis
O: Scaphoid and trapezium, flexor retinaculum
I: Lateral side of 1st metacarpal
Abductor digiti minimi
O: Pisiform (palmar surface)
I: Medial side of base of proximal phalanx of 5th digit
Flexor digit minimi
O: Hook of hamate, flexor retinaculum
I: Medial side of base of proximal phalanx of 5th digit
Lumbricals, 1st and 2nd
O: Lateral two tendons of flexor digitorum profundus
I: Lateral sides of extensor expansions of 2nd-5th digits
Lumbricals, 3rd and 4th
O: Medial three tendons of flexor digitorum profundus
I: Lateral sides of extensor expansions of 2nd-5th digits
Dorsal interossei, 1st-4th
O: Adjacent sides of two metacarpals
I: Bases of proximal phalanges, extensor expansions of 2nd-4th digits
Palmar interossei, 1st-3rd
O: Palmar surfaces of 2nd, 4th, and 5th metacarpals
I: Bases of proximal phalanges, extensor expansions of 2nd, 4th, and 5th digits
