The Arm Muscles BIO 238 Instructor: Dr. Gourdine 1

The Arm Muscles

BIO 238Instructor: Dr. Gourdine

1

LE 8-4

Greater tubercle

Lesser tubercleIntertubercular

grooveAnatomical

neck

Surgicalneck

Deltoidtuberosity

Lateralepicondyle

Coronoidfossa

Medialepicondyle

Radialfossa

Shaft

Capitulum

CondyleAnterior surface

Trochlea

HeadGreater tubercle

Radial groove

Olecranonfossa

Trochlea

Posterior surface

LE 8-5

Coronoidprocess

RADIUS

Ulnar head

Olecranon

Proximalradioulnar

joint

ULNA

Styloid processof ulna

Posterior view

Styloidprocessof radius

Ulnar notchof radius

Location ofinterosseousmembrane

Radialtuberosity

Neck ofradius

Radial head

ULNA

Ulnarhead

Distal radioulnarjoint

Radial notch

Trochlear notch

Ulnartuberosity

Anterior view

LE 9-10

Humerus Radialcollateralligament

Radialtuberosity

Radius

Ulna

Capitulum Annular ligament(covering head and

neck of radius)

Lateral view

Antebrachialinterosseous

membrane

Radius

Ulna

Medial view

Tendon of bicepsbrachii muscle

Annularligament

Humerus

Articularcapsule

Medialepicondyle

Ulnarcollateralligament

Olecranonof ulna

LE 8-6b

RADIUSULNA

Triquetrum

Posterior view

Pisiform

Hamate

VIV III II

I

Lunate

Scaphoid

Trapezium

Trapezoid

Capitate

Metacarpalbones

Proximalphalanx

Distalphalanx

Middlephalanx

LE 11-18a

Right hand, anterior (palmar) view

Flexor retinaculum

Elbow Extension and Flexion

7

Wrist movements

8

Terminology

•Radial deviation= wrist abduction•Ulnar Deviation= wrist adduction

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Muscles of the Upper Extremities: Brachium

• Biceps brachii (pg 95)▫ O-

Short head-Coracoid process of scapula

Long head-Supraglenoid tubercle of scapula

▫ I-Tuberosity of radius, bicipital aponeurosis

▫ A-Flexion of elbow, Supination of forearm, flexion of shoulder

10

Muscles of the Upper Extremities: Brachium• Triceps brachii (pg 97)

▫ O- Long head- Infraglenoid

tubercle of the scapula Lateral head- posterior

surface of proximal half of the humerus

Medial head-Posterior surface of distal half of the humerus

▫ I- Olecranon process of ulna▫ A-

All heads: Extension of elbow

Long head: extension and adduction of shoulder

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Muscles of the Upper Extremities: Brachium

• Brachialis (pg 132)▫ O-Distal half of anterior

surface of humerus▫ I-Tuberosity and

coronoid process of ulna▫ A-Flexion of elbow

12

Muscles of the Upper Extremities: Antebrachium - Anterior

• Brachioradialis (pg 133)▫ O- Proximal 2/3 of the

lateral supracondylar ridge of humerus

▫ I-Styloid process of radius

▫ A-Flexion of elbow ; Assist to pronate and supinate the forearm when the movements are resisted

13

Muscles of the Upper Extremities: Antebrachium - Posterior

• Extensor carpi radialis brevis (pg 136)▫ O-Lateral epicondyle of

humerus (common extensor tendon)

▫ I-Base of 3rd metacarpal▫ A-Extension and

Abduction of wrist, assist with elbow flexion

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• Extensor carpi radialis longus (pg 136)▫ O- Distal 1/3 of the

lateral supracondylar ridge of humerus

▫ I-Base of 2nd metacarpal▫ A-Extension and

abduction of wrist

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• Extensor digitorum (pg 136)▫ O-Lateral epicondyle of


▫ I-Bases of Middle and distal phalanges if 2nd -5th fingers

▫ A-Extension of 2nd - 5th fingers

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• Extensor carpi ulnaris (pg 136)▫ O-Lateral epicondyle of


▫ I-Base of 5th metacarpal▫ A-Extension and

adduction of wrist

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• Anconeus (pg 139)▫ O-Lateral epicondyle of

humerus▫ I- Olecranon process and

posterior, proximal surface of ulna

▫ A- Extension of elbow

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• Flexor carpi radialis (pg 141)▫ O- Common flexor tendon

from medial epicondyle of humerus

▫ I-Bases of 2nd and 3rd metacarpals

▫ A-Flexion and abduction of wrist, may assist with elbow flexion

19


• Palmaris longus (pg 141)▫ O-Common flexor

tendon from medial epicondyle of humerus

▫ I- Palmar aponeurosis, flexor retinaculum

▫ A- Tenses palmar fascia, Flexes wrist, may assist with elbow flexion

20


• Flexor carpi ulnaris (pg 142)▫ O-

Humeral head: common flexor tendon of medial epicondyle of humerus

Ulnar head: posterior surface of proximal 2/3 of ulna

▫ I-Pisiform, hook of hamate, base of 5th metacarpal

▫ A-Flexion and adduction of wrist

21


• Pronator teres (pg 146)▫ O- Common flexor tendon

from medial epicondyle of humerus and coronoid process of ulna

▫ I-Middle of lateral surface of radius

▫ A-Pronation of forearm, assists in flexion of elbow

•

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• Pronator Quadratus (pg 147)▫ O-Medial, anterior surface

of distal ulna▫ I-Lateral, anterior surface

of distal radius▫ A-Pronates forearm

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• Supinator (pg 147)▫ O-Lateral epicondyle of

humerus, annular and radial collateral ligaments, proximal ulna at supinator crest

▫ I- Anterior, lateral surface of proximal 1/3 of radial shaft

▫ A-Supination of forearm

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Figure 11–16b

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The Arm Muscles BIO 238 Instructor: Dr. Gourdine 1