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Functional Anatomy > Muscles of posterior compartment of forearm > Flashcards

Muscles of posterior compartment of forearm Flashcards

1
Q

What is the proximal attachment of the brachioradialis?

A

Proximal 2/3 of supra-epicondylar ridge of humerus

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2
Q

What is the distal attachment of the brachioradialis?

A

Distal end of radius proximal to styloid process

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3
Q

What nerve innervates the brachioradialis?

A

Radial nerve (C5,C6,C7)

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4
Q

What is the muscle action of the brachioradialis?

A

Relatively weak flexion of forearm

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5
Q

What is the proximal attachment of the extensor carpi radialis longus?

A

Lateral supra-epicondylar ridge of humerus

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6
Q

What is the distal attachment of the extensor carpi radialis longus?

A

Dorsal aspect of base of 2nd metacarpal

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7
Q

Whatnerve innervates the the extensor carpi radialis longus?

A

Radial nerve (C6,C7)

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8
Q

What is the muscle action of the extensor carpi radialis longus and the extensor carpi radialis brevis?

A

Extend and abduct hand at the wrist joint

Longus: is active during fist clenching

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9
Q

What is the proximal attachment of the extensor carpi radialis brevis, extensor digitorum, and the extensor digiti minimi

A

Lateral epicondyle of humerus

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10
Q

What is the distal attachment of the extensor carpi radialis brevis?

A

Dorsal aspect of base of 3rd metacarpal

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11
Q

What nerve innervates the extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, and extensor carpi ulnaris?

A

Deep branch of radial nerve (C7,C8)

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12
Q

What is the distal attachment of the extensor digitorum?

A

Extensor expansions of medial four digits

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13
Q

What is the muscle action of the extensor digitorum?

A

Extends medial four digits primarily at metacarpophalangeal joints

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14
Q

What is the distal attachment of the extensor digiti minimi?

A

Extensor expansion of 5th digit

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15
Q

What is the muscle action of the extensor digiti minimi?

A

Extends 5th digit primarily at metacarpophalangeal joint

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16
Q

What is the proximal attachment of the extensor carpi ulnaris?

A

Lateral epicondyle of humerus and posterior border of ulna

17
Q

What is the distal attachment of the extensor carpi ulnaris?

A

Dorsal aspect of base of 5th metacarpal

18
Q

What is the muscle action of the extensor carpi ulnaris?

A

Extends and adducts hand at wrist joint (also active during first clenching)

19
Q

What is the proximal attachment of the supinator?

A

Lateral epicondyle of humerus,
Radial collateral and angular ligaments,
Supinator fossa,
Crest of ulna

20
Q

What is the distal attachment of the supinator?

A

Lateral, posterior, and anterior surfaces of proximal third of radius

21
Q

What nerve innervates the supinator?

A

Deep branch of radial nerve (C7,C8)

22
Q

What is the muscle action of the supinator?

A

Supinates forearm, rotates radius to turn palm anteriorly or superiorly (if elbow is flexed)

23
Q

What is the proximal of the attachment of the extensor indicis?

A

Posterior surface of distal third of ulna and interosseous membrane

24
Q

What is the distal attachment of the extensor indicis?

A

EXtensor expansion of the 2nd digit

25
Q

What is the proximal attachment of the abductor pollicis longus?

A

Posterior surface of proximal halves of ulna, radius, and interosseous membrane.

26
Q

What is the distal attachment of the abductor pollicis longus?

A

Base of 1st metacarpal

27
Q

What nerve innervates the abductor pollicis longus, extensor pollicis longus, and the extensor pollicis brevis?

A

Posterior interosseous nerve (C7,C8), continuation of deep branch of radial nerve.

28
Q

What is the muscle action of the abductor pollicis longus?

A

Abducts thumb and extends it at carpometacarpal joint

29
Q

What is the proximal attachment of the extensor pollicis longus?

A

Posterior surface of middle third of ulna and interosseous membrane

30
Q

What is the distal attachment of the extensor pollicis longus?

A

Dorsal aspect of base of distal phalanx of thumb

31
Q

What is the muscle action of the extensor pollicis longus?

A

Extends distal phalanx of thumb at interophalangeal joint, and extents metacarpophalangeal and carpometacarpal joints.

32
Q

What is the proximal attachment of the extensor pollicis brevis?

A

Posterior surface of distal third of radius and interosseous membrane.

33
Q

What is the distal attachment of the extensor pollicis brevis?

A

Dorsal aspect of base of proximal phalanx of thumb.

34
Q

What is the muscle action of the extensor pollicis brevis?

A

Extends proximal phalanx of thumb at metacarpophalangeal joint, and extends carpometacarpal joint.

Functional Anatomy (9 decks)

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