Posterior Forearm (Extensor-Supinator, Deep Layer)

Question 1

How many muscles are in the deep layer of the posterior forearm?

Answer 1

5

Question 2

Name the 5 muscles of the deep layer of the posterior forearm?

Answer 2

SUPINATOR
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EXTENSOR INDICIS
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ABDUCTOR POLLICIS LONGUS
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EXTENSOR POLLICIS BREVIS
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EXTENSOR POLLICIS LONGUS

Question 3

Which muscle of the deep layer of the posterior forearm can be seen clearly by extending the thumb?

Answer 3

EXTENSOR POLLICIS BREVIS

Question 4

Supinator has a superior superficial and deep attachment, name them?

Answer 4

SUPERFICIAL - LATERAL EPICONDYLE
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DEEP - SUPINATOR FOSSA/CREST OF ULNA

Question 5

What is supinator’s inferior/distal attachment?

Answer 5

ANTERIOR/LATERAL/POSTERIOR PARTS OF PROXIMAL RADIUS

Question 6

What action is supinator responsible for, and at which joints?

Answer 6

SUPINATION
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RADIOULNAR JOINTS

Question 7

Name the 4 muscles of the deep layer of the posterior forearm which attach superiorly at specific areas on the posterior mid-distal forearm?

Answer 7

EXTENSOR INDICIS
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ABDUCTOR POLLICIS LONGUS
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EXTENSOR POLLICIS BREVIS
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EXTENSOR POLLICIS LONGUS

Question 8

Name the inferior attachment of extensor indicis?

Answer 8

EXTENSOR EXPANSION OF THE 2ND DIGIT

Question 9

Which muscle of the deep layer of the posterior forearm attaches inferiorly at the base of the 1st metacarpal?

Answer 9

ABDUCTOR POLLICIS LONGUS

Question 10

Name the inferior attachment of extensor pollicis brevis?

Answer 10

BASE OF THE PROXIMAL PHALANX OF THE THUMB

Question 11

Which muscle of the deep layer of the posterior forearm attaches inferiorly at the base of the distal phalanx of the thumb?

Answer 11

EXTENSOR POLLICIS LONGUS

Question 12

Which 2 muscles of the deep layer of the posterior forearm perform the action of 1st metacarpalphalangeal (MCP) extension?

Answer 12

EXTENSOR POLLICIS BREVIS
+
EXTENSOR POLLICIS LONGUS

Question 13

Which muscle performs the action of extending the 2nd digit?

Answer 13

EXTENSOR INDICIS