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Upper Limb > Deep extensors of forearm > Flashcards

Deep extensors of forearm Flashcards

1
Q

What is the origin of anconeus?

A

Lateral epicondyle

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2
Q

What is the insertion site of anconeus?

A

Olecranan and proximal posterior surface of the humerus.

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3
Q

What is the innervation of anconeus?

A

Radial Nerve (C7, C8, T1)

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4
Q

What is the action of anconeus?

A

Abduction of the ulna during pronation, accessory extensor of the elbow joint

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5
Q

What is the origin for extensor indicis?

A

Posterior surface of ulna and interosseous membrane

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6
Q

What is the insertion site for extensor indicis?

A

Extensor expansion of 2nd digit

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7
Q

What is the action of extensor indicis?

A

Extends 2nd digit and helps to extend hand

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8
Q

What is the origin of extensor pollicis brevis?

A

Posterior surface of radius and interosseous membrane

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9
Q

What is the insertion of extensor pollicis brevis

A

Base of proximal phalanx of thumb

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10
Q

What is the action of extensor pollicis brevis?

A

Extends proximal phalanx of thumb at carpometacarpal joint

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11
Q

What is the origin of extensor pollicis longus?

A

Posterior surface of middle 1/3 of ulna and interosseous membrane

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12
Q

What is the insertion of extensor pollicis longus?

A

Base of distal phalanx of thumb

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13
Q

What is the action of extensor pollicis longus?

A

Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints

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14
Q

What is the origin of abductor pollicis longus?

A

Posterior surfaces of ulna, radius and interosseous membrane

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15
Q

What is the insertion site of abductor pollicis longus?

A

Base of 1st metacarpal

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16
Q

What is the action of abductor pollicis longus?

A

Abducts thumb and extends it at carpometacarpal joint

17
Q

What is the common innervation of the deep extensors

A

Posterior interoesseous nerve, the continuation of the deep branch of the radial nerve (C7, C8)

18
Q

Where does supinator originate?

A

Superficial head: Lateral epicondyle of humerus

Deep head: radial collateral and annular ligaments, supinator foss and crest of ulna

19
Q

Where does supinator insert?

A

Upper lateral 1/3 of humerus

20
Q

What is the innervation of supinator?

A

Deep branch of radial nerve (C5, C6)

Upper Limb (12 decks)

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