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Extensors of Forearm & Dorsum of Hand LAB MANUAL
|Topic and Text Reference | Learning Objectives | Special Instructions | Clinical Exercises | Key Structures
TOPIC AND TEXT REFERENCE: EXTENSORS OF THE FOREARM AND DORSUM OF THE HAND, PP. 35-36
LEARNING OBJECTIVES: (Click on a Learning Objective to go to the relevant section of the Study Module.)Understand and observe the common origin of the extensor muscle group.
Observe how the muscles in the extensor compartment can be divided into superficial and deep portions.
Learn the functions associated with the superficial and deep muscles respectively.
Identify the digits that have extensor muscles in addition to the extensor digitorum.
Learn the boundaries of the “anatomical snuff box,” and what passes through it.
Trace the nerves that supply the muscles in this compartment.
Learn the blood supply to these muscles.
Learn the cutaneous innervation to the dorsum of the hand.
SPECIAL INSTRUCTIONS FOR LAB TODAY:Pg. 35: To skin the dorsum of the hand, simply release the skin by pulling it as if you were removing a glove. The incisions made the previous day should be sufficient. Go through the dissector line by line.
CLINICAL EXERCISES:
1. Examine the dorsum of your wrist or your partner’s wrist. What is the bump just proximal to the wrist joint on the little finger side of the wrist?Styloid process of the the ulna.
2.Palpate the styloid process of the radius. Where does it lie in relation to the styloid process of the ulna?
It is extends further distally than does the ulna. This explains why the wrist can adducted to a greater degree than abducted.
3.What is the clinical relevance of the anatomical snuff box?
No, not for snorting cocaine! But rather for pinpointing the location of the radial artery and the scaphoid bone.
4. Damage to which nerve results in wrist drop?
KEY STRUCTURES:
You should be able to identify in a cadaver all the structures listed under key words unless they have an asterisk.
Click "I" for images and drawing from our lab, from Netter's, and Gold Standard. Click "S" for relevant pages in the Study Module.
Arteries extensor indicis N1 G1 radial artery G1 extensor pollicis brevis N1 G1 (probe) Muscles extensor pollicis longus N1 G1 (probes) abductor pollicis longus N1 G1 supinator N1 G1 brachioradialis N1 G1 Nerves dorsal interossei N1 posterior interosseous nerve N1 dorsal interosseus, first G1 radial nerve, deep branch G1 (probe) dorsal interosseus, second G1 radial nerve, superificial branch G1 dorsal interosseus, third G1 Tendons dorsal interosseus, fourth G1 extensor pollicis brevis tendon G1 extensor carpi radialis brevis N1 G1 extensor pollicis longus tendon G1 extensor carpi radialis longus N1 G1 Other structures extensor carpi ulnaris N1 G1 anatomical snuff box N1 G1 extensor digiti minimi N1 G1 extensor retinaculum N1 G1 extensor digitorum N1 G1
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