1. Muscles that Move the Forearm & Hand

2. 2. An extensor is the triceps brachii muscle.
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Muscles that Move the Forearm: These muscles arise from the humerus or pectoral girdle and connect to the ulna and radius.
2. An extensor is the triceps
brachii muscle.
3.Flexors are the biceps brachii,
brachialis, and brachioradialis.
4.Rotators include the supinator,
pronator teres, and pronator quadratus.

3. Muscles that move the forearm
Extensor
Triceps brachii
extends forearm and arm (Elbow extensor)

5. Muscles that move the forearm
Flexors
Biceps brachii
flexes the forearm and supinates the hand
Brachialis
Flexes forearm
Brachioradialis
flexes forearm

7. Muscles That Move the Forearm
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Trapezius
Clavicle
Subscapularis
Deltoid
Coracobrachialis
Medial border
of scapula
Short head of
biceps brachii
Long head of
biceps brachii
Brachialis
(a)
Subscapularis
Coracobrachialis
Biceps brachii
(short and long
heads)
Brachialis
(b)
(c)
(d)

8. Muscles That Move the Forearm

9. Muscles that Move the Wrist, Hand, and Fingers
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Muscles that Move the Wrist, Hand, and Fingers
1. Movements of the hand are caused by muscles originating from the distal humerus, and the radius and ulna.
2. Flexors include the flexor carpi radialis, flexor carpi ulnaris, palmaris longus, and flexor digitorum superficialis, flexor digitorum profundus
3. Extensors include the extensor carpi
radialis longus, extensor carpi radialis
brevis, extensor carpi ulnaris, and extensor digitorum.

10. Muscles of the forearm: Anterior
Wrist Flexors (4)
Flexor carpi radialis
flex wrist and abduct hand
Flexor carpi ulnaris
Flex wrist and adduct hand
Palmaris longus
flex wrist
Flexor digitorum superficialis
Flex wrist (and fingers)

11. Muscles of the forearm: Anterior
Digit Flexors (2)
Flexor digitorum superficialis
Flex fingers (and wrist)
Flexor digitorum profundus
Flex distal joint of fingers

13. Muscles That Move the Hand- Flexors
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Biceps brachii
Brachialis
Supinator
Pronator teres
Brachioradialis
Brachioradialis
Flexor carpi radialis
Extensor carpi
radialis longus
Flexor carpi ulnaris
Palmaris longus
Flexor carpi ulnaris
Flexor digitorum
superficialis
Pronator quadratus
Flexor retinaculum
(a)
(b)
Flexor digitorum
superficialis
Pronator teres
Flexor carpi radialis
Pronator quadratus
(c)
(d)
(e)

14. Muscles of the Forearm: Posterior
Wrist Extensors (3)
Extensor carpi ulnaris
Extends & adducts hand
Extensor carpi radialis longus
Extends and abducts hand
Extensor carpi radialis brevis

15. Muscles of the Forearm: Posterior
Wrist Extensors (3)
Extensor carpi ulnaris
Extends & adducts hand
Extensor carpi radialis longus
Extends and abducts hand
Extensor carpi radialis brevis

17. Muscles That Move the Hand – Extensors
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Triceps brachii
Brachioradialis
Extensor carpi
radialis longus
Flexor carpi ulnaris
Extensor carpi ulnaris
Extensor carpi
radialis brevis
Extensor digitorum
Extensor carpi
radialis longusand
brevis
Extensor retinaculum
Extensor
carpi ulnaris
Extensor
digitorum
(a)
(b)
(c)

18. Muscles That Move the Hand
Flexors (anterior) and extensors (posterior)

19. Muscles of the Abdominal Wall

20. Muscles of the Abdominal Wall & Pelvic Outlet

21. Muscles of the Abdominal Wall & Pelvic Outlet

22. Muscles of the Abdominal Wall
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This group of muscles connects the rib cage and vertebral column to the pelvic girdle. Contraction of these muscles decreases the volume of the abdominal cavity and increases the pressure inside. This helps force air out of the lungs during forceful expiration, (coughing, laughing, etc.) and also aids in urination, defecation, vomiting and childbirth. A band of tough connective tissue, the linea alba, extending from the xiphoid process to the symphysis pubis, serves as an attachment site for certain abdominal wall muscles, and is an important surgical landmark.

23. Muscles of Abdominal Wall
Rectus abdominus--vertical midline
Three layers form lateral walls:
1)External oblique (“hands-in-pocket”)
2)Internal oblique (fibers perpendicular to external)
3)Transverse abdominus (wraps around)

24. Muscles of abdominal wall

25. Muscles of abdominal wall--details
External oblique –Tenses abdominal wall
Flexes and laterally bends the trunk

26. Muscles of abdominal wall--details
Rectus abdominis
Flexes the trunk
Tenses abdominal wall
Internal oblique
Flexes and laterally bends the trunk

27. Muscles of abdominal wall--details
Transverse abdominis
Tenses abdominal wall

28. Muscles of the Abdominal Wall