Muscles of the Upper Limb

Question 1

Origin, Insertion, and Action of the Coracobrachiallis

Answer 1

O:Coracoid Process of scapula

I:Medial, Midshaft of Humerus

A:Arm Flexion, adduction @ shoulder

Question 2

Origin, Insertion, and action of the Pectoralis Major

Answer 2

O:Clacicle, Sternum, Costal Cartilage of ribs 1-6

I: Intertubercular Groove of Humerus

A:Arm Adduction, Medial (Internal) rotation @ shoulder, Arm Flexion @shoulder

Question 3

Origin, Insertion, and Action of the Supraspinatus (part of rotator cuff)

Answer 3

O:Supraspinous fossa of scapula

I: Greater tubercle of Humerus

A:Arm adduction @ shoulder

Question 4

Origin, Insertion, and Action of the Infraspinatus (Part of the rotator cuff)

Answer 4

O:Infraspinus fossa of scapula

I:Greater tubercle of humerus

A:Arm lateral (external) rotation @ shoulder

Question 5

Origin, Insertion, and Action of the Teres Minor (part of the rotator cuff)

Answer 5

O: Posterior (dorsal) lareral scapula

I: Greater tubercle of humerus

A:Arm lateral (external) rotation @ shoulder

Question 6

Origin, Insertion, and Action of the Subscapularis (part of the rotator cuff)

Answer 6

O:Subscapular fossa of scapula

I:Lesser Tubercle of humerus

A:Arm Medial (internal) rotation @ shoulder

Question 7

Origin, Insertion, and Action of the Teres Major

Answer 7

O:Inferios angle of scapula

I:Intertubercular groove of humerus (Like Pecs)

A:Arm Adduction, medial (internal) rotation, extension @ shoulder

Question 8

Origin, Insertion, and Action of the Latissimus dorsi

Answer 8

O:Spinous process of vertebrae T6-sacrum, iliac crest

I:Intertubercular groove of humerus

A:Arm extension, adduction, medial (internal) rotation @ shoulder

Question 9

Origin, Insertion, and Action of the Deltoid (could also be grouped in anterior muscles)

Answer 9

O:Clavicle, Acromion process, spine of scapula

I:Deltoid tuberosity on shaft of humerus

A:Arm abduction @ shoulder (medial fibers), Arm flexion, Medial (internal) rotation @ shoulder (anterior fibers), Arm extension, lateral (external) rotation @ shoulder

Question 10

Origin, Insertion, and Action of the Biceps Brachii (long head// short head)

Answer 10

O:Supraglenoid tubercle of scapula (LH)// Coracoid process of scapula (SH)

I:Radial Tuberosity of Radius

A: Forarm flexion @ elbow, Arm flexion @ shoulder (LH), Forearm/hand supination @ radioulnar joints

Question 11

Origin, Insertion, and Action of the Brachialis

Answer 11

O:Anterior surface of humerus

I:Coronoid process of ulna

A:Forearm flexion @ elbow

Question 12

Origin, Insertion, and Action of the Brachioradialis

Answer 12

O: Lateral Supracondylar ridge of humerus

I:Styloid process of radius

A:Forearm Flexion @ elbow

Question 13

Origin, Insertion, and Action of the Triceps Brachii (Long head, Lateral Head, Medial Head)

Answer 13

O:Infraglenoid tubercle od scapula (long), Posterior shaft of humerus (lateral and medial)

I:Olecranon of ulna

A:Arm Extension @ shoulder (Long), Forearm extension @ elbow

Question 14

Origin, Insertion, and Action of the Anoconeus

Answer 14

O: Lateral epicondyle of humerus

I:Olecranon of ulna

A:Forearm extension @ elbow

Question 15

Origin, Insertion, and Action of the Supinator

Answer 15

O:Lateral epicondyle of humerus, Proximal ulna

I:Proximal shaft of radius

A:Forearm/hand supination @ radioulnar joints

Question 16

Origin, Insertion, and Action of the Pronator Teres

Answer 16

O:Medial epicondyle of humerus (common felxor tendon), coronoid process of ulna

I:Lateral surface of midshaft of radius

A:Forearm/hand pronation @ radioulnar joints

Question 17

Origin, Insertion, and Action of the Pronator Quadratus

Answer 17

O:Distal Ulna

I:Distal Radius

A:Forearm/hand pronation @ radioulnar joints

Question 18

Origin, Insertion, and Action of the Flexor Carpi Ularis

Answer 18

O:Medial epicondyle of humerus (common flexor tendon), Proximal posterior ulna

I:Pisiform, hamate and 5th metacarpal

A:Hand flexion @ wrist, Hand adduction @ wrist (ulnar deviation)

Question 19

Origin, Insertion, and Action of the Flexor Carpi Radialis

Answer 19

O:Medial epicondyle of humerus (common flexor tendon)

I:2nd and 3rd metacarpal

A:Hand felxion @ wrist (redial deviation)

Question 20

Origin, Insertion, and Action of the Flexor Digitorum Superficialis

Answer 20

O:Medial epcondyle of humerus (common flexor tendon), Coronoid process of Ulna, Radial shaft

I: Midle phalanx of each of 2-5

A:Finger flexion @ interphalangeal joints, aids in hand flexion @ wrist

Question 21

Origin, Insertion, and Action of the Flexor Digitorum Profundus

Answer 21

O:Proximal ulda, coronoid of ulna, IOM (interosseous membrane)

I:Distal Phalanx of 2-5

A:Finger flexion @ interphalangeal joints, Aids in hand flexion @ wrist

Question 22

Origin, Insertion, and Action of the Palmaris Longus

Answer 22

O:Medial epicondyle of humerus (common flexor tendon)

I:Palmar aponeurosis

A:Hand Flexion, adduction @ wrist (ulnar deviation)

Question 23

Origin, Insertion, and Action of the Extensor Carpi Ulnaris

Answer 23

O:Lateral epicondyle of humerus (common extensor tendon), Proximal, posterior ulna

I:5th Metacarpal

A:Hand extension, adduction @ wrist (alnar deviation)

Question 24

Origin, Insertion, and Action of the Extensor digiti minimi

Answer 24

O:Leteral epicondyle of humerus (common extensor tendon)

I:Phalanges of little finger

A:Little finger extension @ interphalangeal joints

Question 25

Origin, Insertion, and Action of the Extensor digitorum

Answer 25

O:Lateral epicondyle of humerus (common extemsor tendon)

I:Phalanges of each 2-5 fingers

A:Finger extension @ interphalngeal joints

Question 26

Origin, Insertion, and Action of the Extensor Carpi Radialis (longus and brevis)

Answer 26

O:Lateral supercondylar ridge (Longus), Lateral epicondyle fo humerus (brevis) (common extensor tendon)

I:2nd and 3rd metacarpal

Hand extension, abduction @ wrist (radial deviation)