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Semester 2 - MSK > Session 5 - Posterior Muscles of the forearm > Flashcards

Session 5 - Posterior Muscles of the forearm Flashcards

1
Q

Name the seven superficial muscles in the posterior compartment of the forearm

A

brachioradialis, extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris and aconeus

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2
Q

What are the muscles in the posterior compartment of the forearm also known as?

A

The extensor muscles

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3
Q

What occurs in all superficial posterior muscles bar two?

A

Continue as tendons into the hand

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4
Q

What are the two muscle in the superficial posterior compartment of the forearm with tendons which do not extend into the hand?

A

The brachioraialis and aconeus

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5
Q

What is A?

A

The brachioradialis

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6
Q

What name can all superficial posterior muscles be known as, other than the aconeous and brachioradialis

A

Extrinsic hand muscles

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7
Q

What type of movement is the brachioradialis responsible for? Why is this weird?

A

Flexion Origin and innervation are characteristic of extensor, and lies in extensor compartment

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8
Q

In the distal forearm, what can be found below the brachioradialis?

A

The radial artery and nerves

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9
Q

What is the brachioradialis most visible?

A

When half pronated and fleing at the elbow against resistance

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10
Q

What is the action of the brachioradialis?

A

Flexion at the elbow

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11
Q

What is the innervation of the brachioradialis?

A

Radial nerve

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12
Q

What are B and C?

A

Extensor Carpi Radialis Longus and Brevis

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13
Q

What is the aciton of the extensor carp radialis longus and brevis?

A

Extension and abduction of the wrist

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14
Q

What is the innervation of every muscle in this deck?

A

Radial nerve, so yeh.

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15
Q

What are the nerve roots of the radial nerve?

A

C5-T1

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16
Q

What is D?

A

The Aconeus

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17
Q

What is the aconeus blended with?

A

Fibres of the triceps brachii

18
Q

What is the action of the aconeus?

A

Moves the ulna during pronation and extends at the elbow joint

19
Q

What is E?

A

Extensor Carpi Ulnaris

20
Q

What is the action of the extensor carpi ulnaris?

A

Extension and adduction of wrist

21
Q

What is F?

A

Extensor Digitorum

22
Q

What is significant about the extensor digitorum (think about the name)

A

Main extensor of the fingers, makes up most of the posterior surface of the forearm

23
Q

What are the actions of the extensore digitorum?

A

Extends medial four finger at metacarpal and IP joints

24
Q

What is G?

A

Extensor Digiti Minimi

25
Q

What is the action of the Extensor Digiti Minimi

A

Extends the little finger and contributes to extension at the wrist

26
Q

What occurs if there is injury to the radial nerve?

A

Wrist drop Radial nerve innervates the muscles that extend at the wrist and are paralysed. The wrist undergoes unopposed flexion and wristdrop results

27
Q

Name five deep muscles of the posteior forearm

A

the supinator, abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus and extensor indicis

28
Q

What is A?

A

Supinator

29
Q

What does the supinator form the floor of?

A

The cubital fossa

30
Q

What is the action of the supinator

A

Supinates the forearm

31
Q

What is B?

A

Abductor pollicis longus

32
Q

What border does the abductor pollicus longus contribute to?

A

The lateral border of the anatomical snuff box

33
Q

What is the action of the abductor pollicis longus?

A

Abducts the thumb

34
Q

What is C?

A

Extensor indicis

35
Q

What is the action of the extensor indicis?

A

Extends the index finger

36
Q

What is D?

A

Extensor Pollicis Brevis

37
Q

What is the action of the extensor pollicis brevis?

A

Extends the MCP and carpometacarpal joints of the thumb

38
Q

What border does extensor pollicis brevis contribute to?

A

The lateral border of the anatomical snuff box

39
Q

What is E?

A

Extensor Pollicis Longus

40
Q

What is the action of the abductor pollicis longus?

A

Abducts the thumb

Semester 2 - MSK (36 decks)

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