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ANAT 392 - Meag > POSTERIOR COMPARTMENT OF FOREARM > Flashcards

POSTERIOR COMPARTMENT OF FOREARM Flashcards

1
Q

Brachio-radialis

A

O - Lateral supracondylar ridge
I - Styloid process of radius
A - Elbow flexion
NS - radial

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2
Q

Aconeus

A

O - Posterior surface of lateral epicondyle
I - Lateral surface of olecranon and upper 1/3 of posterior surface of superior ulna
A - extension of elbow
NS - radial

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3
Q

What two structures does the brachioradialis cover

A
  • Superficial brachial nerve

- Radial artery

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4
Q

Extensor carpi radialis brevis

A

O - Lateral epicondyle
I - Proximal end of 3rd MC
A - Wrist and elbow extension, radial deviation
NS - Deep radial N.

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5
Q

Extensor carpi radialis longus

A

O - Lateral epicondylar ridge
I - base of 2nd MC
A - extension of wrist and elbow, radial deviation
NS - Radial N.

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6
Q

The deep branch of radial passes through the ___ and becomes the _____

A

supinator and becomes the posterior interosseous

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7
Q

Extensor digiti minimi

A

O - lateral epicondyle
I - Dorsal digital expansion of 5th finger
A - extension of all joints of 5th finger and wrist
NS - posterior interosseous

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8
Q

Extensor digitorum

A

O - Lateral epicondyle
I - Dorsal digital expansion of fingers 2-5 and through this indirectly attached to middle and distal phalanges
A - Extension of wrist, MCP joint, proximal and distal IP joints
NS - posterior interosseous nerve

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9
Q

What is connecting the tendons of extensor digitorum? what is the result of these connections

A

Fibrous bands - intertendinous connection. they help to synchronize the extension of your fingers

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10
Q

What is a vincula

A

expansion of synovial membrane

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11
Q

What is the purpose of vincula(e)

A

not real fibrous tissue, so the can not attach of stabilize, but they act as a passage for blood vessels to the tendons - supply blood to tendons

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12
Q

Supinator

A

O - Lateral epicondyle, supinator crest of ulna
I - Lateral aspect of middle 1/3 of shaft of radius
A - Supination
NS - Deep radial

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13
Q

Extensor carpi ulnaris

A

O - Lateral epicondyle
I - Proximal end of 5th MC
A - Extension elbow, extension + adduction of wrist
NS - Posterior interosseous N.

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14
Q

Supinator has attachments to what 2 soft tissue structures

A

Radial collateral ligament

Annular ligament

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15
Q

Abductor pollicis longus

A

O - Shaft of ulna
I - Proximal end of 1 MC bone
A - Abduction of thumb
NS - posterior interosseous nerve

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16
Q

Extensor indicis

A

O - Shaft of ulna
I - Extensor expansion of 2nd finger
A - Extends index finger, weak extensor of wrist
NS - Posterior interosseous nerve

17
Q

Are the actions of extensor indicis and extensor digiti minimi synchronized with extensor digitorum

A

no

18
Q

Extensor pollicis longus

A

O - Shaft of ulna
I - Distal phalanx of thumb
A - Extension of DIP and PIP and 1st MC of thumb
NS - Posterior interosseous

19
Q

Extensor pollicis brevis

A

O - Posterior surface of radius and IO
I - Proximal phalanx of thumb
A - Extension of proximal phalanx or thumb, extension of wrist, radial deviation
NS - Posterior interosseous N.

20
Q

Which nerve pierces the supinator? what was it before entering the supinator?

A

Posterior interosseous nerve

Deep radial nerve

21
Q

Which muscle tendons cause the most tension with the extensor retinaculum? why?

A

Extensor pollicis longus + brevis and abductor pollicis brevis because the are running on a angle

22
Q

What is the result of increased friction between muscle tendons and the extensor retinaculum

A

More prone to inflammation, tenosynovitis, tendonitis, tenovaginitis

23
Q

What is the inflammation of the tendons of EPL, EPB, APB called

A

De-quervain syndrome

24
Q

What is the result of de-quervain syndrome (inflammation of the tendons of EPL, EPB, APB)

A

The overproduction of synovial fluid in the tendon sheaths. Will appear as a balloon above or below the retinaculum. Painful extension and abduction of thumb

25
Q

What is the balloon of synovial fluid found above and below the retinaculum in de-quervains syndrome called?

A

Ganglion

26
Q

Which tendons are found in the extensor retinaculum - in order from medial to lateral

A 
Extensor carpi ulnaris 
Extensor digiti minimi 
Extensor digitorum 
Extensor indicus 
Extensor pollicis longus 
Extensor carpi radialis brevis 
Extensor carpi radialis longus 
Extensor pollicis brevis 
Abductor pollicis longus
27
Q

What two tendons are on either side of lister’s tubercle

A

Extensor pollicis longus

Extensor carpi radialis brevis

28
Q

Which tendons of the extensor compartment share a synovial sheath

A

ECRB and ECRL
ED and EI
Ext PB and ABD PL

29
Q

Listers tubercle is in line with…

A

axis of middle finger

30
Q

The dorsal carpal arch is made up by branches from what arteries

A

The dorsal carpal branch of the Ulnar A and dorsal carpal radial branch of the radial A.

31
Q

What arteries branch off of the dorsal carpal arch

A

Dorsal metacarpal arteries

32
Q

What structures can be found in the anatomical snuff box

A

radial artery and superficial radial nerve and scaphoid

33
Q

what type of joint is the middle radio-ulnar joint

A

syndesmosis joint

34
Q

What are the supporting structures of the proximal radial ulnar joint

A

Annular ligament
quadrate ligament
Oblique cord

35
Q

What are the two bony surfaces of the inferior radio-ulnar joint

A

head of the ulna and ulnar notch of the radius

36
Q

What type of joint is the inferior radio-ulnar joint

A

synovial pivot joint

37
Q

What is the biconcave triangular disc of the inferior radio-ulnar joint made up of? where does it attach?

A

Fibrocartilage

Attaches to styloid process of ulna and below ulnar notch of radius

38
Q

what is the purpose of the biconcave triangular disc

A

The ulna and the triquetrum are both convex surfaces, the disc increases congruency

39
Q

Does the disc have a role in regulating or limiting the range of supination or pronation

A

no!

ANAT 392 - Meag (18 decks)

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