Upper Extremity Muscle Origin, Insertion, Action, Innervation Flashcards
Pec Minor
O, I, A, Ns
O: upper ribs
I: coracoid process of the scapula
A: protraction/abduction of the scapula; forced inspiration
Ns: medial pectoral nerve
Subclavius
O, I, A, N
O: first rib
I: Subclavian groove on clavicle
A: move clavicle medially; protective cushion between clavicle and subclavian vessels
N: Nerve to Subclavius
Trapezius
O, I, A, Ns
O: Occiput, External occipital protuberance, spines of the thoracic vertebra, ligamentum nuchae
I: Clavicle; acromion process and spine of the scapula
A: stabilizes the scapula, elevates scapula, adducts scapula
N: Motor - SAN (CN XI); Sensory - C4 and C5
Rhomboid Major
O, I, A, N
O: Spine, upper thoracics
I: Vertebral border of the scapula
A: elevate/adduct scapula; stabilizes scapula
N: DSN
Rhomboid Minor
O, I, A, N
O: Spine, lower cervical and T1
I: Vertebral border of the scapula
A: Adduct/elevate scapula; stabilize scapula
N: DSN
Levator Scapula
O, I, A, N
O: Transverse processes of the upper cervicals
I: Superior angle of the scapula
A: Elevate/adduct scapula; stabilize scapula
N: DSN
Latissimus Dorsi
O, I, A, N
O: Spines of the lower thoracic and lumbar vertebrae; thoracodorsal fascia; crest of the ilium
I: Intertubercular groove (LT)
A: extends, adducts, medially rotates the humerus; forced expiration (cough)
N: Thoracodorsal nerve
Serratus Anterior
O, I, A, N
O: Upper ribs
I: vertebral border of the scapula
A: Abduct/protract scapula; stabilize scapula; forced inspiration when humerus is abducted
N: Long thoracic
Pec Major Origin Insertion Action Nerve Supply
O: Clavicle, sternum/upper ribs, external oblique
I: Greater tubercle/inter tubercular groove
A: EM-adduct/medially rotate humerus, forced inspiration; CP-flexed humerus at shoulder joint; ScP-extends humerus at shoulder joint
N: medial and lateral pectoral nerve
Deltoid
O, I, A, N
O: Ant-clavicle; middle-acromion process; post-spine of scap
I: Deltoid tuberosity of humerus
A: ant-flex/medially rotates arm; middle-abduct arm; post-extends/laterally rotates arm
N: Axillary N
Supraspinatus
O,I,A,N
O: Supraspinous fossa
I: Greater tuberosity
A: Laterally rotate arm, initiates abduction of the arm, stabilizes shoulder joint
N: Suprascapular nerve
Infraspinatus
O, I, A, N
O: Infraspinous fossa
I: Greater tuberosity
A: laterally rotates humerus; stabilizes shoulder joint
N: Suprascapular nerve
Subscapularis
O, I, A, N
O: Subscapular fossa
I: Lesser tuberosity
A: medially rotates humerus; stabilizes shoulder joint
N: upper and lower subscapular nerve
Teres Minor
O, I, A, N
O: Axillary border
I: Greater tuberosity
A: laterally rotates humerus, stabilizes shoulder joint
N: Axillary nerve
4 muscles of the rotator cuff?
Supraspinatus, infraspinatus, teres minor, subscapularis
Teres Major
O, I, A, N
O: Inferior angle
I: Intertubercular groove (LT)
A: Medially rotates humerus, adducts humerus, stabilizes shoulder joint
N: lower subscapular N
Biceps Brachii
O, I, A, N
O: SH-coracoid process of scapula; LH-supraglenoid tubercle of scapula
I: Tuberosity of radius and shaft of ulna
A: flex forearm at elbow joint; supinate radius prime mover
N: Musculocutaneous N
Coracobrachialis
O, I, A, N
O: Coracoid process of scapula
I: Shaft humerus
A: flexion/adduction humerus at shoulder joint, stabilizes shoulder joint
N: Musculocutaneous (goes thru middle of this)
Brachialis
O,I,A,N
O: Shaft humerus
I: coronoid process of ulna
A: equal prime mover of flexion of the forearm
N: Musculocutaneous
Triceps brachii
O, I, A, N
O: Longhead-infraglenoid tubercle Lateral and medial head-Shaft humerus
I: olecranon process ulna
A: Extend forearm
N: Radial nerve
Pronator Teres
O, I, A, N
O: Medial epicondyle, coronoid process of the ulna
I: pronator ridge of the radius
A: pronation at the superior radioulnar joint; assists in flexion at the elbow joint
N: Median nerve
Flexor Carpi Radialis
O, I, A, N
O: Medial epicondyle
I: 2nd metacarpal with a little piece on 3rd
A: prime mover in flexion at wrist joint; assists abduction of hand
N: Median nerve
Palmaris longus
O, I, A, N
O: Medial epicondyle
I: palmar aponeurosis
A: helps flex hand and helps with palm grip
N: Median nerve
Flexor Carpi Ulnaris
O, I, A, N
O: Medial epicondyle, olecranon process
I: pisiform, hamate, 5th metacarpal
A: Prime mover in flexion of the hand, adduction of hand
N: Ulnar N
Flexor Digitorum Superficialis
O, I, A, N
O: Medial epicondyle
I: Middle phalanges digits 2-5
A: Flexes PIP joint and helps flex hand
N: Median N
Flexor Digitorum Profundus
O, I, A, N
O: Shaft of ulna
I: distal phalanges digits 2-5
A: Flexes DIP joint and helps flex hand
N: Median and Ulnar
Flexor Pollicis Longus
O, I, A, N
O: Shaft of radius
I: distal phalanx of digit one
A: flexes digit at IP joint
N: Median N
Pronator Quadratus
O, I, A, N
O: Shaft of ulna
I: Shaft of radius
A: Pronation at inferior radial-ulnar joint; stabilized the inferior radial-ulnar joint
N: Median
Brachioradialis
O, I, A, N
O: Lateral Supercondylar ridge of the humerus
I: Styloid process of the radius
A: flexes forearm; pronates and supinates forearm
N: Radial N
Extensor Carpi Radialis Longus
O, I, A, N
O: lateral epicondyle of the humerus
I: 2nd metacarpal
A: extends and abducts hand
N: Radial N
Extensor carpi radialis brevis
O, I, A, N
O: lateral epicondyle of the humerus
I: 3 metacarpal
A: extends and abducts the hand
N: Radial N
Extensor Digitorum (Maximus) O, I, A, N
O: lateral epicondyle
I: 2-5 middle phalanges
A: Extend those digits and hand; abduct digits 2, 4, 5
N: Radial N
Extensor Digiti Minimi
O, I, A, N
O: Lateral epicondyle
I: Proximal phalanx of digit 5
A: extends digit 5
N: radial N
Extensor Carpi Ulnaris
O, I, A, N
O: lateral epicondyle
I: 5th metacarpal
A: extends hand; adducts hand
N: Radial N
Supinator
O, I, A, N
O: lateral epicondyle; supinator ridge of ulna
I: shaft of radius
A: supination of the forearm
N: Radial N
Abductor Pollicis Longus
O, I, A, N
O: Shaft of radius and ulna
I: 1st metacarpal
A: abducts digit one at CM joint
N: Radial
Extensor Pollicis Brevis
O, I, A, N
O: Shaft of radius
I: proximal phalanx of digit one
A: extends digit one at MP joint
N: Radial nerve
Extensor Pollicis Longus
O, I, A, N
O: Shaft ulna
I: distal phalanx digit one
A: extends digit one at IP joint
N: Radial
Extensor Indicis
O, I, A, N
O: Shaft ulna
I: proximal phalanx digit 2
A: extends digit 2 at MP joint
N: radial n
Anconeus
O, I, A, N
O: Lateral epicondyle
I: Olecranon process of ulna
A: extends forearm
N: radial N
Abductor pollicis brevis
O, I, A, N
O: Trapezium and scaphoid
I: Proximal phalanx 1st digit
A: abduct digit one at MP joint
N: Median Nerve
Flexor pollicis brevis
O, I, A, N
O: Trapezium, trapezoid, capitate
I: proximal phalanx of digit 1
A: flex digit one at MP joint
N: Median and ulnar nerves
Opponens Pollicis
O, I, A, N
O: Trapezium
I: 1st metacarpal
A: medially rotates 1st metacarpal
N: Median N
Adductor Pollicis
O, I, A, N
O: Trapezoid, Capitate, 2nd and 3rd metacarpal
I: proximal phalanx of digit one
A: adduct digit one
N: Ulnar N
