Muscle Chart 2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Pectoralis Major | Origin:Medial half of clavicle; sternum;
costal cartilages of ribs 1-6
Insertion:Lateral lip of intertubercular groove
on humerus
Action:Flexion, medial rotation, and
adduction of the arm
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| Pectoralis Minor | Origin:External surfaces of ribs 3-5
Insertion:Coracoid process of scapula
Action:Depression and inferior rotation of
scapula
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| Serratus Anterior | Origin:External surfaces of ribs 1-8
Insertion:Medial border of scapula
Action: holds scapula against
thoracic wal
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| Latissimus dorsi | Origin:Spinous processes of vertebrae T6-
T12; thoracolumbar fascia; iliac crest;
inferior three ribs
Insertion:Intertubercular groove of humerus
Action:Extension, adduction, and medial
rotation of arm
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| Trapezius | Origin:Posterior surface of occipital bone;
ligamentum nuchae; spinous
processes of thoracic vertebrae
Insertion:Lateral third of clavicle; acromion
process; spine of scapula
Action:Superior fibers: elevate scapula
Middle fibers: retract scapula
I
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| Deltoid | Origin:Lateral third of clavicle; acromion
process; spine of scapula
Insertion:Deltoid tuberosity of humerus
Action:Anterior fibers: medial rotation and
flexion of arm
Middle fibers: abduction of arm
Posterior fibers: lateral rotation and
extension
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| Rhomboid minor | Origin:ligamentum nuchae; spinous
processes of vertebrae C7 and T1
Insertion:Medial border of scapula
Action:Elevates scapula;
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| Teres Major | Origin:Scapula, near inferior angle
Insertion:Medial lip of intertubercular groove
Action:Extension, adduction, and medial
rotation of arm
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| Supraspinatus | Origin:Supraspinous fossa of scapula
Insertion:Greater tubercle of humerus
Action:Abduction of arm
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| Infraspinatus | Origin:Infraspinous fossa of scapula
Insertion:Greater tubercle of humerus
Action:Lateral rotation of arm
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| Teres Minor | Origin:Lateral border of scapula
Insertion:Greater tubercle of humerus
Action:Lateral rotation of arm
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| Subscapularis | Origin:Subscapular fossa of scapula
Insertion:Lesser tubercle of humerus
Action:Adduction and medial rotation of arm
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| Biceps Brachii | Origin:Long Head:superior margin of
glenoid fossa of scapula Short Head: coracoid process of scapula
Insertion:Radial tuberosity of radius; fascia of
medial forearm via bicipital
aponeurosis
Action:Flexion and supination of forearm;
flexion of arm
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| Brachialis | Origin:Anterior surface of humerus
Insertion:Coronoid process of ulna
Action:Flexion of forearm
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| Coracobrachialis | Origin: Coracoid process of scapula
Insertion:Medial surface of humerus
Action:Flexion and adduction of arm
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| Triceps Brachii | Origin:Lateral Head: posterior surface of
humerus
Medial Head: posterior surface of
humerus, inferior to origin of lateral head
Insertion:Olecranon process of ulna
Action:Extension of forearm; long head
extends and adducts arm
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| Pronator Teres | Origin:Medial epicondyle of humerus;
coronoid process of ulna
Insertion:Lateral surface of radius
Action:Pronation and flexion of the forearm
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| Flexor Carpi Radialis | Origin:Medial epicondyle of humerus
Insertion:Base of metacarpal of the second digit
Action:Flexion and abduction of the wrist
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| Palmaris Longus | Origin:Medial epicondyle of humerus
Insertion:Flexor retinaculum; palmar
aponeurosis
Action:Flexion of wrist
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| Flexor Carpi Ulnaris | Origin:Medial epicondyle of humerus;
olecranon process of ulna
Insertion:Medial carpal bones; metacarpal of
fifth digit
Action:Flexion and adduction of the wrist
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| Flexor Pollicis Longus | Origin:Anterior surface of radius;
Insertion:Distal phalanx of thumb
Action:Flexion of the wrist and thumb
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| Brachioradialis | Origin:Lateral supracondylar ridge of
humerus
Insertion:Lateral surface of distal radius
Action:Flexion of forearm
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| Extensor Carpi Radialis Longus | Origin:Lateral supracondylar ridge of
humerus:Metacarpal of the second digit
Action:Extension and abduction of the wrist
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| Extensor Carpi Radialis Brevis | Origin:Lateral epicondyle of humerus
Insertion:Metacarpal of third digit
Action:Extension and abduction of the wrist
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| Extensor Digitorum | Origin:Lateral epicondyle of humerus
Insertion:Extensor expansions of medial four
digits
Action:Extension of wrist and fingers
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| Extensor Carpi Ulnaris | Origin:Lateral epicondyle of humerus;
posterior surface of ulna
Insertion:Metacarpal of the fifth digit
Action:Extension and adduction of the wrist
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| Anconeus | Origin:Lateral epicondyle of humerus
Insertion:Olecranon process of ulna
Action:Very weak extension of the forearm
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| Supinator | Origin:Lateral epicondyle of humerus;
proximal ulna
Insertion:Posterior, lateral, and anterior surfaces
of proximal radius
Action:Supination of the forearm
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| Abductor Pollicis Longus | Origin:Posterior surfaces of radius and ulna;
interosseous membrane
Insertion:Metacarpal of thumb
Action:Abducts and extends thumb
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Created by:
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