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Gross Anatomy Exam 2 > Muscles of the Posterior Compartment of the Arm > Flashcards

Muscles of the Posterior Compartment of the Arm Flashcards

0
Q

Insertion of Brachioradialis

A

Lateral Surface of distal end of radius proximal to styloid process

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1
Q

Origin of Brachioradialis

A

Proximal 2/3 of the lateral supracondylar ridge of the humerus

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2
Q

Innervation of Brachioradialis

A

Radial Nerve (C5,C6,C7)

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3
Q

Action of Brachioradialis

A

Relatively Weak Flexion of the Elbow, maximal when the forearm is in midpronated position

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4
Q

Origin of Extensor Carpi Radialis Longus (ECRL)

A

Lateral Supra-Epicondylar Ridge of the humerus

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5
Q

Insertion of the Extensor Carpi Radialis Longus (ECRL)

A

Dorsal Aspect of Base of 2nd Metacarpal

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6
Q

Innervation of Extensor Carpi Radialis Longus (ECRL)

A

Radial Nerve (C6, C7)

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7
Q

Action of Extensor Carpi Radialis Longus (ECRL

A

Extend and ABduct wrist joint

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8
Q

Origin of Extensor Carpi Radialis Brevis (ECRB)

A

Lateral Epicondyle of the Humerus

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9
Q

Insertion of Extensor Carpi Radialis Brevis (ECRB)

A

Dorsal Aspect of Base of 3rd Metacarpal

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10
Q

Innervation of Extensor Carpi Radialis Brevis (ECRB)

A

Deep Branch of Radial Nerve (C7, C8)

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11
Q

Action of Extensor Carpi Radialis Brevis (ECRB)

A

Extend and ABduct the Wrist Joint; Extensor Carpi Radialis Brevis active during clenching of fist

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12
Q

Origin of Extensor Digitorum

A

Lateral Epicondyle of the Humerus

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13
Q

Insertion of Extensor Digitorum

A

Extensor Expansion of Medial Four Fingers

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14
Q

Innervation of Extensor Digitorum

A

Posterior Interosseous Nerve (C7,C8), Continuation of Deep Branch of Radial Nerve

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15
Q

Action of Extensor Digitorum

A

1) Extend Wrist Joint

2) Extend Medial Four Fingers primarily at metapophalangeal joints, secondarily at interphalangeal joints

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16
Q

Origin of Extensor Digiti Minimi

A

Lateral Epicondyle of Humerus

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17
Q

Insertion of Extensor Digiti Minimi

A

Extensor Expansion of 5th Finger

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18
Q

Innervation of Extensor Digiti Minimi

A

Posterior Interosseous Nerve (C7,C8) , continuous of deep branch of radial nerve

19
Q

Action of Extensor Digiti Minimi

A

1) Extends wrist joint

2) Extends 5th finger primarily at the metacarpophalangeal joint, secondarily at the interphalangeal joint

20
Q

Origin of Extensor Carpi Ulnaris (ECU)

A

1) Lateral Epicondyle of the Humerus

2) Posterior Border of Ulna via a shared aponeurosis

21
Q

Insertion of Extensor Carpi Ulnaris

A

Dorsal Aspect of Base of 5th Metacarpal

22
Q

Innervation of Extensor Carpi Ulnaris (ECU)

A

Posterior Interosseous Nerve (C7,C8), continuation of deep branch of radial nerve

23
Q

Action of Extensor Carpi Ulnaris (ECU)

A

1) Extend and ADDuct the wrist joint

2) Extensor Carpi Ulnaris also active during fist clenching

24
Q

Superficial Layer of Muscles of Posterior Compartment of Forearm

A 
Brachioradialis
Extensor Carpi Radialis Longus
Extensor Carpi Raidalis Brevis
Extensor Digitorum
Extensor Digiti Minimi
Extensor Carpi Ulnaris
25
Q

Which Muscle is in the Deep Layer of the Posterior Compartment of the Forearm

A

Supinator

26
Q

Origin of the Supinator

A

1) Lateral Epicondyle of the Humerus 2) Radial Collateral and Anular Ligament 3) Supinator Fossa 4) Crest of Ulna

27
Q

Insertion of Supinator

A

Lateral, Posterior, and Anterior Proximal 1/3 of the Radius

28
Q

Innervation of Supinator

A

Deep Branch of Radial Nerve (C7,C8)

29
Q

Action of Supinator

A

1) Supinates the Forearm 2) Rotate the Radius to turn palm anteriorly or posteriorly (if Elbow is flexed)

30
Q

Origin of Abductor Pollicis Longus

A

Posterior Surface of Proximal Halves of Ulna, Radius, and Interosseous Membrane

31
Q

Insertion of the Abductor Pollicis Longus

A

Base of the 1st Metacarpal

32
Q

Innervation of Abductor Pollicis Longus

A

Posterior Interosseus Nerve (C7, C8), Continuation of Deep Branch of Radial Nerve

33
Q

Action of Abductor Pollicis Longus

A

1) Extends Wrist Joint 2) Abducts the thumb and extends it at carpometacarpal joint

34
Q

What muscles make the “outcropping” of deep layer of posterior compartment of arm?

A

1) Abductor Pollicis Longus
2) Extensor Pollicis Longus
3) Extensor Pollicis Brevis
4) Extensor Indicis

35
Q

Origin of the Extensor Pollicis Longus

A

Posterior Surface of Middle Third of Ulna and Interosseous Membrane

36
Q

Insertion of the Extensor Pollicis Longus

A

Dorsal Aspect of the Base of the Distal Phalanx of the Thumb

37
Q

Innervation of Extensor Pollicis Longus

A

Posterior Interosseous Nerve (C7,C8), Continuation of deep branch of radial nerve

38
Q

Action of Extensor Pollicis Longus

A

1) Extend wrist joint

2) Extend the distal phalanx at the interphalangeal joint, extend metacarpophalangeal and carpometacarpal joints

39
Q

Origin of Extensor Pollicis Brevis

A

Posterior Surface of Distal Third of Radius and Interosseous Membrae

40
Q

Insertion of Extensor Pollicis Brevis

A

Dorsal Aspect of Base of Proximal Phalanx of Thumb

41
Q

Innervation of Extensor Pollicis Brevis

A

Posterior Interosseous Nerve (C7,C8), Continuation of Deep Branch of Radial Nerve

42
Q

Action of Extensor Pollicis Brevis

A

1) Extends Wrist Joint

2) Extends Proximal Phalanx at metacarpophalangeal joint; extends carpometacarpal joint

43
Q

Origin of Extensor Indicis

A

Posterior Surface of Distal Third of Ulna and Interosseous Membrane

44
Q

Insertion of Extensor Indicis

A

Extensor Expansion of 2nd Finger (Index Finger)

45
Q

Innervation of Extensor Indicis

A

Posterior Interosseous Nerve (C7, C8), Continuation of Deep Branch of Radial Nerve

46
Q

Action of Extensor Indicis

A

1) Extend wrist joint

2) Extend 2nd Finger (enabling its independent extension); helps extend hand at wrist

Gross Anatomy Exam 2 (15 decks)

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