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Spot Test > Posterior Extensor Compartment of the Forearm > Flashcards

Posterior Extensor Compartment of the Forearm Flashcards

1
Q

Layers of the Posterior Compartment?

A

Superficial

Deep

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2
Q

General common origin of extensor muscles?

A

Lateral Epidcondyle of the Humerus

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3
Q

Muscles in the Superficial Compartment

A 
Brachioradialis
Extensor Carpi Radialis Longus
Extensor Carpi Radialis Brevis
Extensor Digitorum
Extensor Carpi Ulnaris
Extensor Digiti Minimi
Anconeus
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4
Q

Muscles in the Deep Compartment

A 
Supinator
Extensor Pollicis Longus
Extensor Pollicis Brevis
Abductor Pollicis Longus
Extensor Indicis
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5
Q

Function of Brachioradialis

A

Accessory flexor during mid pronation despite being in the posterior extensor compartment!

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6
Q

Origin of Brachioradialis

A

Lateral Supraepicondylar Ridge

Adjacent Intermuscular Septum

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7
Q

Insertion of Brachioradialis

A

Lateral Distal Radius

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8
Q

Innervation of Brachioradialis

A

Radial Nerve

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9
Q

Function of Extensor Carpi Radialis Longus

A

Extends and abducts the wrist

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10
Q

Origin of Extensor Carpi Radialis Longus

A

Supraepicondylar ridge

Adjacent Intermuscular Septum

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11
Q

Insertion of Extensor Carpi Radialis Longus

A

Base of Metacarpal 2

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12
Q

Innervation of Extensor Carpi Radialis Longus

A

Radial Nerve

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13
Q

Function of Extensor Carpi Radialis Brevis

A

Extends and abducts the wrist

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14
Q

Origin of Extensor Carpi Radialis Brevis

A

Lateral Epicondyle

Adjacent Intermuscular Septum

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15
Q

Insertion of Extensor Carpi Radialis Brevis

A

Base of Metacarpals 2 and 3

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16
Q

Innervation of Extensor Carpi Radialis Brevis

A

Radial Nerve (deep branch)

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17
Q

Function of Extensor Digitorum

A

Extensor of Digits 2-5 (and wrist)

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18
Q

Origin of Extensor Digitorum

A

Lateral Epicondyle

Adjacent Intermuscular Septum and Deep fascia

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19
Q

Insertion of Extensor Digitorum

A

Middle and Distal Phalanges of Digits 2- 5 via Extensor Hoods

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20
Q

Innervation of Extensor Digitorum

A

Posterior Interosseous Nerve

continuation of deep branch of radial nerve

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21
Q

Function of Extensor Digiti Minimi

A

Accessory extension of Digit 5

22
Q

Origin of Extensor Digiti Minimi

A

Lateral Epicondyle
Adjacent Intermuscular Septum

Inserts with Extensor Digitorum

23
Q

Insertion of Extensor Digiti Minimi

A

Extensor hood of digit 5

24
Q

Innervation of Extensor Digiti Minimi

A

Posterior Interosseous Nerve

continuation of deep branch of radial nerve

25
Q

Function of Extensor Carpi Ulnaris

A

Extension and adduction of the wrist

26
Q

Origin of Extensor Carpi Ulnaris

A

Lateral Epicondyle

Ulna

27
Q

Insertion of Extensor Carpi Ulnaris

A

Base of Metacarpal 5 (medial side)

28
Q

Innervation of Extensor Carpi Ulnaris

A

Radial Nerve (branch to medial head of triceps)

29
Q

Function of Anconeus

A

Abduction of ulna during pronation

Accessory flexor

30
Q

Origin of Anconeus

A

Lateral Epicondyle

31
Q

Insertion of Anconeus

A

Posterior Ulna and Olecranon

32
Q

Innervation of Anconeus

A

Radial Nerve (branch to medial head of triceps)

33
Q

Function of Supinator

A

Supination of the arm and hand

34
Q

Origin of Supinator

A

Lateral Epicondyle and ligaments (superficial head)

Supinator crest of ulna (deep head)

35
Q

Insertion of Supinator

A

Lateral surface of radius (superior to anterior oblique line)

36
Q

Innervation of Supinator

A

Deep Branch of Radial Nerve (Posterior Interosseus Nerve

37
Q

Function of Abductor Pollicis Longus

A

Abduction of Digit 1

at joint between metacarpal and trapezium

38
Q

Origin of Abductor Pollicis Longus

A

Posterior Ulna and Radius

Interosseus Membrane

39
Q

Insertion of Abductor Pollicis Longus

A

Lateral base of Metacarpal 1

40
Q

Innervation of Abductor Pollicis Longus

A

Posterior Interosseous Nerve

continuation of deep branch of radial nerve

41
Q

Function of Extensor Pollicis Brevis

A

Extension of Metacarpo-phalangeal and carpometacarpal joints of the Thumb

42
Q

Origin of Extensor Pollicis Brevis

A

Posterior Radius distal to Abductor PB origin

Interosseus Membrane

43
Q

Insertion of Extensor Pollicis Brevis

A

Dorsal base of Proximal Phalanx of Digit 1

44
Q

Innervation of Extensor Pollicis Brevis

A

Posterior Interosseous Nerve

continuation of deep branch of radial nerve

45
Q

Function of Extensor Pollicis Longus

A

Extension of all thumb joints

46
Q

Origin of Extensor Pollicis Longus

A

Posterior Ulna

Adjacent Interosseus Membrane

47
Q

Insertion of Extensor Pollicis Longus

A

Dorsal base of Distal Phalanx of Digit 1

48
Q

Innervation of Extensor Pollicis Longus

A

Posterior Interosseous Nerve

continuation of deep branch of radial nerve

49
Q

Function of Extensor Indicis

A

Accessory extensor of the index finger (Digit 2)

50
Q

Origin of Extensor Indicis

A

Posterior Ulna

Adjacent Interosseus Membrane

51
Q

Insertion of Extensor Indicis

A

Extensor hood of Digit 2

52
Q

Innervation of Extensor Indicis

A

Posterior Interosseous Nerve

continuation of deep branch of radial nerve

Spot Test (16 decks)

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