Download Exercise 1. Review the following muscles on the Visible Body

Lab 9
Muscles of the Wrist and Hand
M ATERI ALS

human torso model
•
Upper extremity models
•
human skeleton
•
Visible Body Application
•
Anatomage dissection table
•
textbook and lecture notes for reference
O BJECTIVES
Upon the completion of these laboratory exercises, you should be able to:
1. Identify various anatomical structures of the elbow and wrist joints.
2. Identify the muscles of the elbow and wrist joints.
3. Apply biomechanical principles to the elbow and wrist joints.
4. Identify origin, insertion, nerve innervation of the muscles of the elbow and wrist joints
Key muscles and nerve innervation
extensor carpi radialis longus
extensor carpi radialis brevis
extensor digitorum communis
extensor digiti minimi
extensor carpi ulnaris
extensor indicis
radial (C6,7)
radial (C6, 7)
radial (C6,7,8)
radial (C6,7,8)
radial (C6,7,8)
radial (C6,7,8)
abductor pollicis longus
extensor pollicis brevis
extensor pollicis longus
flexor pollicis brevis
radial (C6,7)
radial (C6,7,)
radial (C6,7,8)
lateral part- median (C6,7), medial partulnar (C8, T1)
median (C6,7)
ulnar (C8, T1)
Median and ulnar
ulnar (C8, T1)
ulnar (C8, T1)
opponens pollicis
adductor pollicis
lumbricales
palmar interossei
dorsal interossei
Key Skeletal landmarks
Humerus
 Medial and lateral supracondylar ridges:
 Medial and Lateral Epicondyles
 Trochlea:
 Capitulum:
 Coronoid fossa:
Radius
 Head
 Neck
 Radial tuberosity
 Styloid process
Ulna
 Olecranon process:
 Coronoid process:
 Head:
 Styloid process
Carpals:
 Navicular aka. (scaphoid)
 lunate,
 triquetral,
 pisiform
 trapezium,
 trapezoid,
 capitate,
 hamate (and hook of hamate)
Metacarpals
Phalanges
 distal middle and proximal.
Exercise 1.
Review the following muscles on the Visible Body Application. Apply
the proper nerve innervation and muscle actions.
1. Extensor carpi radialis longus
a.
b.
c.
d.
Origin: lateral epicondyle of humerus, lower supracondylar ridge of humerus
Insertion: base of the dorsal surface of the 2nd metacarpal
Nerve innervation:
Actions:
2. Extensor carpi radialis brevis
a.
b.
c.
d.
Origin: lateral epicondyle of humerus
Insertion: base of the 3rd metacarpal
Nerve innervation:
Actions:
3. Extensor digitorum communis
a.
b.
c.
d.
Origin: lateral epicondyle of humerus
Insertion: dorsal surface of middle and distal bases of the 4 phalanges
Nerve innervation:
Actions:
4. Extensor digiti minimi
a.
b.
c.
d.
Origin: lateral epicondyle of humerus
Insertion: dorsal surface of the middle and distal phalanges of the 5 th phalange
Nerve innervation:
Actions:
5. Extensor carpi ulnaris
a.
b.
c.
d.
Origin: lateral epicondyle of humerus, posterior ulna
Insertion: dorsal surface of 5th metacarpal
Nerve innervation:
Actions:
6. Supinator
a.
b.
c.
d.
Origin: lateral condyle of the humerus, proximal lateral ulna
Insertion: lateral radius
Nerve innervation:
Actions:
7. Anconeus
a.
b.
Origin: posterior lateral condyle of the humerus,
Insertion: posterior ulna
c.
d.
Nerve innervation:
Actions:
8. abductor pollicis longus
a.
b.
c.
d.
Origin: posterior middle radius and ulna
Insertion: dorsal surface of 1st metacarpal
Nerve innervation:
Actions:
9. Extensor pollicis brevis
a.
b.
c.
d.
Origin: posterior surface of distal radius
Insertion: base of proximal phalanx of the thumb (dorsal side)
Nerve innervation:
Actions:
10. Extensor pollicis longus
a.
b.
c.
d.
Origin: posterior lateral ulna
Insertion: dorsal surface of the distal phalanx of the thumb
Nerve innervation:
Actions:
11. Extensor indicis
a.
b.
c.
d.
Origin: middle distal 1/3 of posterior ulna
Insertion: base of middle and distal phalanges of 2nd phalange
Nerve innervation:
Actions:
1. INTRINIC HAND MUSCLES THUMB
A. (thenar eminence) Flexor pollicis brevis, opponens pollicis abductor pollicis
brevis are innervated by the median nerve. CTS results in atrophy of this
muscle group. Adductor pollicis is innervated by the ulna nerve. Assist in
opposition of the thumb. adduction
B. Hypothenar muscles include : abductor digiti minimi, flexor digiti minimi
brevis and oponens digiti minimi . These muscles are innervated by the ulna
nerve therfor, atrophy suggest an ulna nerve lesion.
C. Lumbricales: worm like muscles that have attachments to the tendons of the
flexor digitorum profundus and extensor expansion on the dorsum of the hand.
D. Palmar interossei: functions in adduction of the pinky, ring and index finger,
Flexion of the metacarpophalangeal Joints and Extension oft he
interphalangeal joints.
E. dorsal interossei act as antagonist to the palmar interossi: DAB: Dorsal
Abducts while PAD: Palmar Adducts