the arm muscles bio 238 instructor: dr. gourdine 1
Post on 16-Dec-2015
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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
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
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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
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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
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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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Muscles of the Upper Extremities: Antebrachium - Posterior
• 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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Muscles of the Upper Extremities: Antebrachium - Posterior
• Extensor digitorum (pg 136)▫ O-Lateral epicondyle of
humerus (common extensor tendon)
▫ I-Bases of Middle and distal phalanges if 2nd -5th fingers
▫ A-Extension of 2nd - 5th fingers
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Muscles of the Upper Extremities: Antebrachium - Posterior
• Extensor carpi ulnaris (pg 136)▫ O-Lateral epicondyle of
humerus (common extensor tendon)
▫ I-Base of 5th metacarpal▫ A-Extension and
adduction of wrist
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Muscles of the Upper Extremities: Antebrachium - Posterior
• 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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Muscles of the Upper Extremities: Antebrachium - Anterior
• 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
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Muscles of the Upper Extremities: Antebrachium - Anterior
• 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
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Muscles of the Upper Extremities: Antebrachium - Anterior
• 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
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Muscles of the Upper Extremities: Antebrachium - Anterior
• 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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Muscles of the Upper Extremities: Antebrachium - Anterior
• 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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