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Gross Anatomy > Dorsal Forearm Muscles > Flashcards

Dorsal Forearm Muscles Flashcards

1
Q

What muscles make up the first, or superficial, layer of dorsal forearm muscles?

A 
Extensor Carpi ulnaris
Extensor digiti minimi 
Extensor digitorum 
Extensor Carpi radialis brevis 
Extensor Carpi radialis Longus
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2
Q

What muscles make up the second, or deeper, layer of dorsal forearm muscles?

A

Extensor indicis
Extensor pollicis Longus
Extensor pollicis brevis
Abductor pollicis Longus.

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3
Q

What three proximal muscles acting on the dorsal forearm have unique origins, insertions, and actions?

A

Anconeus, supinator, brachioradialis

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4
Q

Brachioradialis origin

A

Proximal 2/3rds of the lateral Supracondylar ridge of the humerus

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5
Q

brachioradialis insertion

A

Lateral base of the styloid process of the radius

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6
Q

Brachioradialis nerve

A

radial

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7
Q

Brachioradialis action

A

Flexes at elbow, can initiate pronation and supination.

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8
Q

Supinator (most proximal of deep group and deep to anconeus) origin

A

Superficial part- lateral Epicondyle

Deep part- Supinator crest on lateral ulna

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9
Q

Supinator insertion

A

Proximal 1/3rd radius (wraps around radius) on anterior oblique line

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10
Q

Supinator nerve

A

Deep radial (posterior interosseous)

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11
Q

Supinator action

A

prime Supinator of forearm at elbow

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12
Q

Extensor Carpi radialis longus origin

A

Lower 1/3 of lateral Supracondylar ridge or humerus

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13
Q

Extensor Carpi radialis longus insertion

A

Dorsal surface of the base of second metacarpal

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14
Q

Extensor Carpi radialis longus nerve

A

radial

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15
Q

Extensor Carpi radialis longus action

A

Extends wrist and abducts (radially deviates) hand

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16
Q

Extensor Carpi radialis brevis origin

A

Lateral Epicondyle of humerus and radial collateral ligament

17
Q

Extensor Carpi radialis brevis insertion

A

base of third metacarpal

18
Q

Extensor Carpi radialis brevis nerve

A

radial

19
Q

Extensor Carpi radialis brevis action

A

extends wrist and abducts (radially deviates) hands

20
Q

Extensor Carpi ulnaris origin

A

Common tendon from the lateral Epicondyle of humerus

21
Q

Extensor Carpi ulnaris Insertion

A

Dorsal surface of the base of the 5th metacarpal

22
Q

Extensor Carpi ulnaris nerve

A

interosseous branch of the radial nerve

23
Q

Extensor Carpi ulnaris action

A

Extends and adducts (ulnarly deviates) the hand at wrist.

Gross Anatomy (34 decks)

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