POSTERIOR COMPARTMENT OF FOREARM Flashcards
Brachio-radialis
O - Lateral supracondylar ridge
I - Styloid process of radius
A - Elbow flexion
NS - radial
Aconeus
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
What two structures does the brachioradialis cover
- Superficial brachial nerve
- Radial artery
Extensor carpi radialis brevis
O - Lateral epicondyle
I - Proximal end of 3rd MC
A - Wrist and elbow extension, radial deviation
NS - Deep radial N.
Extensor carpi radialis longus
O - Lateral epicondylar ridge
I - base of 2nd MC
A - extension of wrist and elbow, radial deviation
NS - Radial N.
The deep branch of radial passes through the ___ and becomes the _____
supinator and becomes the posterior interosseous
Extensor digiti minimi
O - lateral epicondyle
I - Dorsal digital expansion of 5th finger
A - extension of all joints of 5th finger and wrist
NS - posterior interosseous
Extensor digitorum
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
What is connecting the tendons of extensor digitorum? what is the result of these connections
Fibrous bands - intertendinous connection. they help to synchronize the extension of your fingers
What is a vincula
expansion of synovial membrane
What is the purpose of vincula(e)
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
Supinator
O - Lateral epicondyle, supinator crest of ulna
I - Lateral aspect of middle 1/3 of shaft of radius
A - Supination
NS - Deep radial
Extensor carpi ulnaris
O - Lateral epicondyle
I - Proximal end of 5th MC
A - Extension elbow, extension + adduction of wrist
NS - Posterior interosseous N.
Supinator has attachments to what 2 soft tissue structures
Radial collateral ligament
Annular ligament
Abductor pollicis longus
O - Shaft of ulna
I - Proximal end of 1 MC bone
A - Abduction of thumb
NS - posterior interosseous nerve
Extensor indicis
O - Shaft of ulna
I - Extensor expansion of 2nd finger
A - Extends index finger, weak extensor of wrist
NS - Posterior interosseous nerve
Are the actions of extensor indicis and extensor digiti minimi synchronized with extensor digitorum
no
Extensor pollicis longus
O - Shaft of ulna
I - Distal phalanx of thumb
A - Extension of DIP and PIP and 1st MC of thumb
NS - Posterior interosseous
Extensor pollicis brevis
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.
Which nerve pierces the supinator? what was it before entering the supinator?
Posterior interosseous nerve
Deep radial nerve
Which muscle tendons cause the most tension with the extensor retinaculum? why?
Extensor pollicis longus + brevis and abductor pollicis brevis because the are running on a angle
What is the result of increased friction between muscle tendons and the extensor retinaculum
More prone to inflammation, tenosynovitis, tendonitis, tenovaginitis
What is the inflammation of the tendons of EPL, EPB, APB called
De-quervain syndrome
What is the result of de-quervain syndrome (inflammation of the tendons of EPL, EPB, APB)
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
What is the balloon of synovial fluid found above and below the retinaculum in de-quervains syndrome called?
Ganglion
Which tendons are found in the extensor retinaculum - in order from medial to lateral
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
What two tendons are on either side of lister’s tubercle
Extensor pollicis longus
Extensor carpi radialis brevis
Which tendons of the extensor compartment share a synovial sheath
ECRB and ECRL
ED and EI
Ext PB and ABD PL
Listers tubercle is in line with…
axis of middle finger
The dorsal carpal arch is made up by branches from what arteries
The dorsal carpal branch of the Ulnar A and dorsal carpal radial branch of the radial A.
What arteries branch off of the dorsal carpal arch
Dorsal metacarpal arteries
What structures can be found in the anatomical snuff box
radial artery and superficial radial nerve and scaphoid
what type of joint is the middle radio-ulnar joint
syndesmosis joint
What are the supporting structures of the proximal radial ulnar joint
Annular ligament
quadrate ligament
Oblique cord
What are the two bony surfaces of the inferior radio-ulnar joint
head of the ulna and ulnar notch of the radius
What type of joint is the inferior radio-ulnar joint
synovial pivot joint
What is the biconcave triangular disc of the inferior radio-ulnar joint made up of? where does it attach?
Fibrocartilage
Attaches to styloid process of ulna and below ulnar notch of radius
what is the purpose of the biconcave triangular disc
The ulna and the triquetrum are both convex surfaces, the disc increases congruency
Does the disc have a role in regulating or limiting the range of supination or pronation
no!
