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Anatomy Muscles > Posterior Compartment Of Forearm > Flashcards

Posterior Compartment Of Forearm Flashcards

1
Q

Muscles of posterior compartment has a common origin at?

A

Posterior (extensor) compartment:
Lateral epicondyl of humerus

Anterior (flexor) compartment:
Medial epicondyl of humerus

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2
Q

The tendons of muscles of posterior compartment of forearm pass through?

A

Extensor retinaculum
(A fibrous band of connective tissue which holds the bands in place)

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3
Q

Difference between flexor retinaculum and extensor retinaculum?

A

The flexor retinaculum is located on the palmar side of the wrist,
while the extensor retinaculum is located on the dorsal side of the wrist.

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4
Q

Origin and insertion of extensor carpi radialis brevis?

A

Origin:
Lateral epicondyl of humeus

Insertion:
Base of 3rd metacarpal bone

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5
Q

Insertion of extensor carpi radialis longus and extensor carpi radialis brevis?

A

Longus-
base of 2nd metacarpal

Brevis
Base of 3rd metacarpal

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6
Q

Action of extensor carpi radialis brevis?

A

Same as longus:

Extends and abducts the wrist

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7
Q

How many tendons of extensor digitorum?

A

4 tendons

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8
Q

Medial to extensor carpi radialis brevis is?

A

Extensor digitorum

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9
Q

Name the muscles of of posterior compartment of forearm?

A

Superficial layer

  1. Extensor carpi radialis brevis
  2. Extensor digitorum
  3. Extensor digiti minimi
  4. Extensor carpi ulnaris
  5. Anconeus

Deep

  1. Supinator
  2. Abductor pollicis longus
  3. Extensor pollicis brevis
  4. Extensor pollicis longus
  5. Extensor indicis
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10
Q

Origin and insertion of extensor digitorum?

A

Origin:
Lateral epicondyl of humerus

Insertion:
Middle & Distal phalanges of medial 4 fingers

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11
Q

Action of extensor digitorum?

A

Extends the fingers and hands

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12
Q

Origin and insertion of Extensor digiti minimi?

A

Origin:
Lateral epicondyl of humerus

Insertion:
Extensor expansion of little finger

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13
Q

Action of extensor digiti minimi?

A

Extends the MCP joint of little ginger

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14
Q

Antagonist of flexor carpi ulnaris?

A

Extensor carpi ulnaris
It extends and adducts the wrist
( not flexion and adduction)

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15
Q

Origin and insertion of extensor carpi ulnaris?

A

Origin:
Lateral epicondyl of humerus

Insertion:
Base of the 5th metacarpal bone

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16
Q

Difference of action of extensor carpi ulnaris and extensor carpi radialis?

A

Extensor Carpi ulnaris
Adducts and extends the wrist

Extensor carpi Radialis
Abducts and extends the wrist

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17
Q

Origin and insertion of anconeus muscle?

A

Origin:
Lateral epicondyl of humerus

Insertion:
Olecrannon process of ulna

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18
Q

The origin of mucles of deep layer of posterior compartment of forearm?

A

Apart from supinator
One head - lateral epicondyl of humerus

All originate from shaft of radius
Ulna
Interosseous membrane

19
Q

Nerve supply for all the muscles of the posterior compartment of forearm?

A

Deep branch of the radial nerve

Anconeus - radial nerve

20
Q

Origin and insertion of supinator?

A

Origin:
1Lateral epicondyl of humerus (superficial head)
2. Annular ligament of the superior radioulnar joint
3. Ulna(deep head)

Insertion:
Neck and shaft of radius

21
Q

Supination of forearm is done by?

A

1.Supinator
2.Biceps brachii

22
Q

Distal to supinator is which muscle?

A

Abductor pollicis longus

23
Q

Origin and insertion of abductor pollicis longus?

A

Origin:
Shaft of radius and ulna

Insertion:
Base of the 1st metacarpal bone

24
Q

Action of abductor pollicis longus?

A

Abducts and extends the thumb

25
Q

Distal to abductor pollicis longus?

A

Extensor pollicis brevis

26
Q

Origin and insertion of extensor pollicis brevis?

A

Origin
Shaft of the radius
Interosseous membrane

Insertion
Base of proximal phalanx of thumb

27
Q

Action of extensor pollicis brevis?

A

Extends the MCP joint of thumb

28
Q

Extensor pollicis longus origin and insertion?

A

Origin
Shaft of ulna
Interosseous membrane

Insertion
Base of distal phalanx of thumb

29
Q

Action of extensor pollicis longus?

A

Extends the distalphalanx of thumb

30
Q

Difference in origin of extensor pollicis brevis and longus?

A

Brevis:
Radius

Longus:
Ulna

31
Q

Origin and insertion of extensor indicis?

A

origin
Shaft of ulna
Interosseous membrane

Insertion
Extensor expansion of index finger

32
Q

Action of extensor indicis?

A

Extends the MCP joint of intex finger

33
Q

The only muscle of posterior compartment of forearm that that originates from shaft of radius and ulna both?

A

Abductor pollicis longus

34
Q

The only muscle of posterior compartment of forearm that that originates from shaft of radius and interosseous membrane?

A

Extensor pollicis brevis

35
Q

The muscles of posterior compartment of forearm that that originates from shaft of ulna and interosseous membrane?

A

1.Extensor pollicis longus
2.Extensor indicis

36
Q

Name the muscles of posterior compartment of forearm of thumb?

A
  1. Abductor pollicis longus
  2. Extensor pollicis brevis
  3. Extensor pollicis longus
37
Q

The anconeus muscle is blended with which muscle?

A

Triceps brachii

38
Q

What is tennis elbow?

A

Lateral epicondilytis
Or tennis elbow is the inflammation of the periosteum of the lateral epicondyle

39
Q

Which muscle forms the floor of the cubital fossa? And its roof?

A

Brachialis - floor
Bicipital aponeurosis - roof

40
Q

How many heads of supinator and what passes through them?

A

2 heads
Deep branch of radial nerve passes through them

41
Q

Which muscles form the lateral border of anatomical snuff box?

A
  1. Abductor pollicis longus
  2. Extensor pillicis brevis
42
Q

The tendon of which muscle forms the medial border of anatomical snuff box?

A

1.Extensor pollicis longus

43
Q

What happens in wrist drop?

A

Unopposed flexion at wrist joint
Damage to:
Radial nerve
(Innervates all muscles in extensorcompartment of forearm so extensor muscles paralysed)
Flexor are unaffected so unopposed flexion

44
Q

What are 2 common characteristics sites of damage of radial nerve?

A
  1. Axilla
    Humeral dislocation or fracture of proximal humerus
  2. Radial groove
    Humeral shaft fracture

Anatomy Muscles (8 decks)

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