Upper extremity Flashcards
Subscapularis
O: Subscapular fossa of
scapula
I: Lesser tubercle of
humerus
N: Upper and lower
subscapular nerves
(C5 - C6)
A: Shoulder joint: Arm internal
rotation; Stabilizes humeral
head in glenoid cavity
Teres minor
O: Lateral border of scapula
I: Greater tubercle of
humerus
N: Axillary nerve (C5, C6)
A: Shoulder joint: Arm external rotation, Arm adduction; Stabilizes humeral head in glenoid cavity
Supraspinatus
O: Supraspinous fossa of
scapula
I: Greater tubercle of
humerus
N: Suprascapular nerve (C5,
C6)
A: Shoulder joint: Arm
abduction; Stabilizes
humeral head in glenoid
cavity
Infraspinatus
O: Infraspinous fossa of
scapula
I: Greater tubercle of
humerus
N: Suprascapular nerve (C5,
C6)
A: Shoulder joint: Arm
external rotation; Stabilizes
humeral head in glenoid
cavity
Deltoid
O: Clavicular part: Lateral third of clavicle Acromial part: Acromion of scapula Spinal part: Spine of scapula
I: Deltoid tuberosity of
humerus
N: Axillary nerve (C5-C6)
A: Shoulder joint: Arm flexion, Arm internal rotation (clavicular part), Arm abduction (acromial part), Arm extension, Arm lateral rotation (spinal part)
Teres major
O: Inferior angle and lower
part of lateral border of
scapula
I: Crest of lesser tubercle of
humerus (a.k.a. Medial lip
of intertubercular sulcus)
N: thoracodorsal nerves
(C5- C7)
A: Shoulder joint: Arm internal
rotation, Arm extension,
Arm adduction
Coracobrachialis
O: Coracoid process of
scapula
I: Anteromedial surface of
humeral shaft
N: Musculocutaneous nerve
(C5 - C6)
A: Shoulder joint: Arm flexion,
Arm adduction
Biceps brachii
O: Long head: Supraglenoid
tubercle of scapula
Short head: Coracoid
process of scapula
I:Radial tuberosity of
radius
N: Musculocutaneous nerve
(C5 - C6
A:Elbow joint: Forearm
flexion and supination;
Shoulder joint: Weak arm
flexion
Brachialis
O: Distal half of anterior
surface of humerus
I: Ulnar tuberosity,
Coronoid process of ulna
N: Musculocutaneous nerve Radial nerve (C5-C7)
A; Elbow joint: Forearm
flexion (in all positions)
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: Olecranon of ulna and
fascia of forearm
N: Radial nerve (C6 - C8)
A: Shoulder joint: Arm extension and adduction (long head); Elbow joint: Forearm extension
Anconeus
O: Lateral epicondyle of
humerus
I: Lateral surface of
olecranon
N: Radial nerve (C7, C8)
A; Elbow joint: Assists in
forearm extension;
Stabilization of elbow joint
Pronator teres
O; Humeral head: Medial supracondylar ridge of humerus Ulnar head: Coronoid process of ulna
I; Lateral surface of
radius (distal to
supinator)
N; Median nerve
(C6, C7)
A; Elbow joint: Forearm flexion;
Proximal radioulnar joint:
Forearm pronation
Flexor carpi radialis
O; Medial epicondyle of humerus
I; Bases of metacarpal
bones 2-3
N; Median nerve
(C6, C7)
A; Wrist joint:Wrist flexion,
Wrist abduction
Flexor carpi ulnaris
O; Medial epicondyle of
humerus, Olecranon and
posterior border of ulna
I; Pisiform bone,
Hamate bone, Base
of metacarpal bone 5
N; Ulnar nerve
(C7-T1)
A; Wrist joint:Wrist flexion,
Wrist adduction
Palmaris longus
O; Medial epicondyle of humerus
I; Flexor retinaculum,
Palmar aponeurosis
N; Median nerve
(C7, C8)
A; Wrist joint: Wrist flexion;
Tenses palmar aponeurosis
Flexor digitorum profundus
O; Proximal half of anterior
surface of ulna, Interosseous
membrane
I; Palmar surfaces of
distal phalanges of
digits 2-5
N; Digits 2-3: Median nerve (anterior interosseous nerve); Digits 4-5: Ulnar nerve (C8, T1)
A; Metacarpophalangeal and
interphalangeal joints 2-5:
Finger flexion
Flexor pollicis longus
O; Anterior surface of radius and
interosseous membrane
I; Palmar surface of
distal phalanx of
thumb
N; Median nerve
(anterior
interosseous nerve)
(C7, C8)
A; Metacarpophalangeal and
interphalangeal joint 1:
Thumb flexion
Pronator quadratus
O; Distal anterior surface of ulna
I; Distal anterior
surface of radius
N; Median nerve
(anterior
interosseous nerve)
(C7, C8)
A; Proximal radioulnar joint:
Forearm pronation
Brachioradialis
O; Lateral supracondylar
ridge of humerus,
Lateral intermuscular
septum of arm
I; Styloid
process of radius
N; Radial Nerve (C5- C8)
A; Elbow joint: Forearm
flexion (when semi
pronated)
Extensor carpi
radialis longus
O; Lateral supracondylar
ridge of humerus,
Lateral intermuscular
septum of arm
I; Posterior aspect of base
of metacarpal bone 2
N; Radial Nerve (C5- C8)
A; Wrist joints: Hand
extension, Hand
abduction (radial
deviation)
Extensor carpi
radialis brevis
O; Lateral epicondyle of
humerus (common
extensor tendon)
I; Posterior aspect of base
of metacarpal bone 3
N; Radial Nerve (C5- C8)
A; Wrist joints: Hand
extension, Hand
abduction (radial
deviation)
Extensor
digitorum
O; Lateral epicondyle of
humerus (common
extensor tendon)
I; Extensor expansions of
digits 2-5
N; Posterior interosseous
nerve (C7, C8)
A; Metacarpophalangeal /
Interphalangeal joints
2-5: Finger extension
Supinator
O; Lateral epicondyle of humerus, Radial collateral ligament, Anular ligament, Supinator crest of ulna
I; Lateral, posterior, and
anterior surfaces of
proximal third of radius
N; Posterior interosseous
nerve (C7, C8)
A; Proximal radioulnar
joint: Forearm
supination
Extensor indicis
O; Posterior surface of
distal third of ulna and
interosseus membrane
I; Extensor expansion of
index finger
N; Posterior interosseous
nerve (C7, C8)
A; Wrist joints: Weak hand extension Metacarpophalangeal and interphalangeal joints of index finger: Finger extension
