Lab Activity 11: Group II

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1 Lab Activity 11: Group II Muscles Martini Chapter 11 Portland Community College BI 231

2 Origin and Insertion Origin: The place where the fixed end attaches to a bone, cartilage, or connective tissue. Insertion: The site where the movable end attaches to another structure. 2

3 Deltoid Origin: Anterior surface, lateral clavicle, acromion process and spine of scapula Insertion: Deltoid tubercle of humerus Action: Abducts humerus; aids in flexion, extension, and internal and external rotation 3

4 Supraspinatus Origin: Supraspinous fossa Insertion: Greater tubercle of humerus Action: Abducts humerus 4

5 Infraspinatus Origin: Infraspinous fossa Insertion: Greater tubercle of humerus Action: Rotates humerus laterally 5

6 Teres Minor Origin: Axillary border of scapula Insertion: Greater tubercle of humerus Action: Rotates humerus laterally 6

7 Teres Major Origin: Axillary border at inferior angle of scapula Insertion: Intertubular groove of humerus Action: Extends, adduction and medial rotates humerus. 7

8 Subscapularis Origin: Subscapular fossa Insertion: Lesser tubercle of humerus Action: Rotates humerus medially 8

9 Biceps Brachii Origin: Long head, supraglenoid tubercle; Short head, coracoid process scapula Insertion: Radial tuberosity of the radius Action: Flexes radius and humerus, and supinates forearm Short Head Long Head 9

10 Coracobrachialis Origin: Coracoid process of scapula Insertion: Middle third of humerus Action: Flexes and adducts humerus 10

11 Triceps Brachii Long Head Lateral Head Origin: Long head, infraglenoid tubercle; Lateral head, proximal portion of posterior humerus; Medial head, distal half of posterior humerus Insertion: Olecranon process of ulna Action: Extends humerus and ulna 11

12 Brachialis Origin: Anterior distal two-thirds of humerus Insertion: Coronoid process of ulna Action: Flexes ulna 12

13 Anconeus Origin: Lateral epicondyle of humerus Insertion: Olecranon process, posterior surface of ulna Action: Weak extensor of ulna, stabilizes elbow joint in extension 13

14 Abductor Pollicis Brevis Origin: Scaphoid and trapezium Insertion: Proximal phalanx of thumb Action: Abducts thumb and aids in flexion Palm 14

15 Flexor Pollicis Brevis Origin: Trapezium Insertion: Proximal phalanx of thumb Action: Flexes thumb 15 Palm

16 Flexor Digiti Minimi Origin: Hook of hamate Insertion: Proximal phalanx of fifth digit Action: Flexes fifth digit 16 Palm

17 Abductor Digiti Minimi Origin: Pisiform and tendon of flexor carpi ulnaris Insertion: Proximal phalanx of fifth digit Action: Abducts fifth digit 17 Palm

18 Pronator Teres Origin: Medial epicondyle of humerus and coronoid process of ulna Insertion: Middle portion of radius Action: Pronates and flexes forearm Anterior, Superficial Layer 18

19 Flexor Carpi Radialis Origin: Medial epicondyle of humerus Insertion: Base of second metacarpal Action: Flexes wrist and elbow and abducts wrist Anterior, Superficial Layer 19

20 Palmaris Longus Origin: Medial epicondyle of the humerus Insertion: Palmar aponeurosis Action: Weak flexion of wrist, tenses skin of palm Anterior, Superficial Layer 20

21 Flexor Carpi Ulnaris Origin: Medial epicondyle of humerus, olecranon process, & posterior ulna Insertion: Pisiform, hamate, and fifth metacarpal Action: Flexes and adducts wrist Anterior, Superficial Layer 21

22 Flexor Digitorum Superficialis Origin: Medial epicondyle of humerus and coronoid process of ulna Insertion: Middle phalanges of fingers Action: Flexes fingers and wrist 22 Anterior, Middle Layer

23 Flexor Digitorum Profundus Origin: Anterior and medial surfaces of ulna and interosseous membrane Insertion: Distal phalanges of fingers Action: Flexes fingers and wrist 23 Anterior, Deepest Layer

24 Flexor Pollicis Longus Origin: Middle half of radius, interosseous membrane, coronoid process of ulna Insertion: Distal phalanx of thumb Action: Flexes thumb and wrist 24 Anterior, Deepest Layer

25 Brachioradialis Origin: Lateral supracondylar ridge Insertion: Styloid process of radius Action: Flexes forearm 25 Posterior, Superficial Layer

26 Extensor Carpi Radialis Longus Origin: Lateral supracondylar ridge of humerus Insertion: Second metacarpal Action: Extends and abducts hand 26 Posterior, Superficial Layer

27 Extensor Carpi Radialis Brevis Origin: Lateral epicondyle of humerus Insertion: Third metacarpal Action: Extends and abducts hand 27 Posterior, Superficial Layer

28 Extensor Digitorum Origin: Lateral epicondyle of humerus Insertion: Into distal phalanx by 4 tendons Action: Extends fingers and hand 28 Posterior, Superficial Layer

29 Extensor Carpi Ulnaris Origin: Lateral epicondyle of humerus and posterior border of ulna Insertion: Fifth metacarpal Action: Extends and adducts hand 29 Posterior, Superficial Layer

30 Extensor Digiti Minimi Origin: Lateral epicondyle of humerus Insertion: Extensor expansion of little finger Action: Extends 5 th digit and hand 30 Posterior, Middle Layer

31 Supinator Origin: Lateral epicondyle of humerus, supinator crest of ulna Insertion: Lateral surface and posterior border of radius Action: Supinates forearm 31 Posterior, Deepest Layer

32 Abductor Pollicis Longus Origin: Posterior surface of ulna and radius, and interosseous membrane Insertion: First metacarpal Action: Abducts thumb and hand 32 Posterior, Deepest Layer

33 Extensor Pollicis Brevis Origin: Middle third of radius and interosseous membrane Insertion: Base of proximal phalanx of thumb Action: Extends thumb 33 Posterior, Deepest Layer

34 Extensor Pollicis Longus Origin: Middle third of ulna and interosseous membrane Insertion: Base of distal phalanx of thumb Action: Extends thumb 34 Posterior, Deepest Layer

35 The End 35

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