Term
| What is the purpose of the extensor retinaculum? |
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Definition
| hold the extensor tendons in place |
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Term
| What is the extensor expansion hood? |
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Definition
| tent of connective tissue that attaches tendons to the dorsum of phalanges |
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Term
| What are the seven superficial muscles of the posterior compartment? |
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Definition
1. brachoradialis
2. extensor carpi radialis longus
3. extensor carpi radialis brevis
4. extensor digitorum
5. extensor digiti minimi
6. extensor carpi ulnaris
7. anconeous |
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Term
| What are characteristics of the extensor carpi radialis longus? |
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Definition
| -tendon is deep to 3 muscles going to thumb |
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Term
| What is the origin and insertion of the extensor carpi radialis longus? |
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Definition
O: lateral epicondyle via the common extensor tendon
I: base of 2nd metacarpal |
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Term
| What are actions and innervation of the extensor carpi radialis longus? |
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Definition
A: wrist extension and wrist abduction
N: radial nerve |
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Term
| What are the characteristics of the extensor carpi radialis brevis? |
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Definition
| -shorter and partially deep to the extensor carpi radialis longus |
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Term
| What is the origin and insertion of the extensor carpi radialis brevis? |
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Definition
O: lateral epicondyle via the common extensor tendon
I: base of 3rd metacarpal |
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Term
| What are the actions and innervation of the extensor carpi radialis brevis? |
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Definition
A: wrist extension and wrist abduction
N: radial nerve |
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Term
| What are the characteristics of the extensor digitorum? |
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Definition
-no superficialis or profundus
-main finger extender |
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Term
| What is the origin and insertion of the extensor digitorum? |
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Definition
O: lateral epicondyle via the common extensor tendon
I: split into 4 tendons that insert onto the extensor hoods of digits 2-5 |
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Term
| What are the actions and innervation of the extensor digitorum? |
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Definition
A: wrist extension and finger extension
N: radial nerve |
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Term
| What is the origin and insertion of the extensor digiti minimi? |
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Definition
O: lateral epicondyle via the common extensor tendon
I: expansion hood of pinky |
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Term
| What are the actions and innervation of the extensor digiti minimi? |
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Definition
A: wrist extension and pinky extension
N: radial nerve |
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Term
| What are the characteristics of the extensor carpi ulnaris? |
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Definition
| -located along the medial forearm |
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Term
| What is the origin and insertion of the extensor carpi ulnaris? |
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Definition
O: lateral epicondyle via the common extensor tendon
I: base of pinky |
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Term
| What are the actions and innervation of the extensor carpi ulnaris? |
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Definition
A: wrist extension and wrist adduction
N: radial nerve |
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Term
| What are the five deep muscles of the posterior compartment? |
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Definition
1. supinator
2. abductor pollicis longus
3. extensor pollicis brevis
4. extensor pollicis longus
5. extensor indicis |
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Term
| What are the characteristics of the supinator? |
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Definition
-hidden by a superficial group
-biceps brachii is its synergist |
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Term
| What is the origin and insertion of the supinator? |
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Definition
O: lateral epicondyle and ulna
I: wraps tightly around radius into which it inserts |
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Term
| What are the actions and innervation of the supinator? |
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Definition
A: supinates the forearm slowly
N: radial nerve |
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Term
| What is the anatomical snuffbox? |
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Definition
| depression on the dorso-lateral side of the wrist that is important for radial artery palpation |
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Term
| What are the boundaries of the anatomical snuffbox? |
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Definition
-extensor pollicis longus (medial border)
-extensor pollicis brevis (lateral border)
-abductor pollicis longus (lateral border) |
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Term
| What are the characteristics of the extensor pollicis longus and brevis? |
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Definition
-tendons exit under the superficial muscles
-crosses tendons of the extensor carpi radialis longus and brevis
-longus hooks around tubercle of radius
-brevis closely associated with abductor pollicis longus |
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Term
| What is the origin and insertion fo the extensor pollicis longus and brevis? |
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Definition
O: medial side of forearm
I: most lateral digit (thumb) |
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Term
| What are the actions and innervation of the extensor pollicis longus and brevis? |
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Definition
A: thumb extension
N: radial nerve |
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Term
| What are the characteristics of the abductor pollicis longus? |
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Definition
| -most lateral tendon of the "snuffbox" |
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Term
| What is the origin and insertion of the abductor pollicis longus? |
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Definition
O: deep to superficial extensors
I: 2nd/3rd metacarpals |
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Term
| What are the actions and innervation of the abductor pollicis longus? |
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Definition
A: thumb abduction and extension
N: radial nerve |
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Term
| What are the planes of motion for the thumb? |
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Definition
flexion/extension happen in the frontal plane
ab/adduction happen in the sagittal plane |
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Term
| What are the characteristics of the extensor indicis? |
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Definition
-extends the index finger
-one of 4 deep muscles exiting laterally |
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Term
| What is the origin and insertion of the extensor indicis? |
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Definition
O: ulna and interosseous membrane
I: expansion hood of 2nd digit |
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Term
| What are the actions and innervation of the extensor indicis? |
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Definition
A: wrist extension and pointer finger extension
N: radial nerve |
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Term
| What is platelet rich plasma therapy (PRPT)? |
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Definition
| expedites the body's natural healing response by injecting your own platelets back into tissue |
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