Upper Arm Muscles Figure 6 15 Copyright 2009

Upper Arm Muscles Figure 6. 15 Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Biceps brachii § 2 heads (long and short) Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

§ supinates forearm, flexes elbow § Origin: Scapula (coracoid process and glenoid fossa) § Insertion: Radial tuberosity Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Brachialis § prime mover for elbow flexion § (50% stronger than bicep brachii) Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

§ deep to the bicep brachii § 50% stronger than bicep brachii Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Brachioradialis § synergist muscle for elbow flexion Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Triceps brachii § elbow extension (antagonist to biceps brachii) § Origin: scapula and humerus § Insertion: ulna (olecranon process) Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Determining Lower Arm Muscles § Remember- ulna is closest to U (medial) Use the names!! Always think in anatomical position § Flexors: flex the wrist (palm up) § Extensors: extend the wrist (palm down) § FEEL YOUR FOREARM!! Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Flexors § Found on anterior of lower arm § The should feel them work when you flex your wrist. Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Flexor Carpi Radialis § Flexes the wrist § Belly of the muscle is high on the forearm § Crosses to the radial side § Attachment at wrist under the index finger Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Flexor Carpi Ulnaris § Flexes the wrist § Runs along the ulna § Attachment under pinky Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Additions: § Pronator Teres: Flexes when wrist twists § Palmaris longus (extends into 4 fingers) Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Extensors Found on posterior of lower arm You will feel them work when you extend your wrist. They will not be in anatomical position. Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Extensor Carpi Radialis (longus and brevis) Extends the hand Runs down the radius to the bottom of index and middle finger Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Extensor Carpi ulnaris Extends the hand Origin at proximal radius but crosses to the far ulnar side Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Extensor digitorum Extends the hand Ligament extends into 4 fingers Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings