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Muscles that Move the Forearm and Hand

Figure 11–16a

Muscles that Move the Forearm and Hand

Figure 11–16b

Muscles that Move the Forearm and Hand

• Originate on humerus and insert on forearm

• Exceptions:– the major flexor (biceps brachii)– the major extensor (triceps brachii)

3D Rotation: Muscles of the Forearm and HandPLAY

Extensors and Flexors• Extensors:

– mainly on posterior and lateral surfaces of arm

• Flexors:– mainly on anterior and medial

surfaces

13 Muscles that Move the Forearm and Hand (1 of

8)• Biceps brachii:

– flexes elbow– stabilizes shoulder joint– originates on scapula– inserts on radial tuberosity

13 Muscles that Move the Forearm and Hand (2 of

8)• Triceps brachii:

– extends elbow– originates on scapula– inserts on olecranon

• Brachialis and brachioradialis:– flex elbow

13 Muscles that Move the Forearm and Hand (3 of

8)• Anconeus:

– opposes brachialis• Palmaris longus:

– superficial– flexes wrist

13 Muscles that Move the Forearm and Hand (4 of

8)• Flexor carpi ulnaris:

– superficial– flexes wrist– adducts wrist

13 Muscles that Move the Forearm and Hand (5 of

8)• Flexor carpi radialis:

– superficial– flexes wrist– abducts wrist

13 Muscles that Move the Forearm and Hand (6 of

8)• Extensor carpi radialis:

– superficial– extends wrist– abducts wrist

13 Muscles that Move the Forearm and Hand (7 of

8)• Extensor carpi ulnaris:

– superficial– extends wrist– adducts wrist

13 Muscles that Move the Forearm and Hand (8 of

8)• Pronator teres and supinator:

– originate on humerus and ulna– rotate radius

• Pronator quadratus:– originates on ulna– assists pronator teres

Muscles that Move the Hand and Fingers

Figure 11–17a, b

Muscles that Move the Hand and Fingers

Figure 11–17c, d

The Intrinsic Muscles of the Hand

Figure 11–18a

The Intrinsic Muscles of the Hand

Figure 11–18b