the forearm and Hand part 3 Flashcards
what muscles compose the superficial latyer of the posterior compartment of the forearm
- extensor carpi radialis longus
- extensor carpi radialis brevis
- extensor digitorum
- extensory carpi ulnaris
- extensor digiti minimi
what is the common insertion of the posterior compartment of the forearm except for extensor carpi radialis longus?
lateral epicondyle
extensor carpi radialis longus
Origin
insertion
function
Origin: lateral supracondylar ridge of the humerus
insertion: base of metacarpal 2
function: abduction (RD) and extension of the hand at the wrist
extensor carpi radialis brevis
insertion
function
insertion: base of metacarpal 3
function: abduction (RD) and extension of the hand at the wrist
extensor digitorum
insertion
function
insertion: splits into 4 tendons that insert on the extensor hood of digits 2-5
function: extension of the wrist, MCP, PIP and DIP
extensory carpi ulnaris
insertion
function
insertion: base of metacarpal 5
function: extension and adduction (UD) of hand at wrist
extensor digiti minimi
insertion
function:
location:
insertion: extensor expansion hood of digit 5
function: acessory extension of digit 5
location: between extensor carpi ulnaris and extensor digitorum
Where is the extensor expansion hood located
on the back of the finger, its the dorsal aspect of the phalanges
what is tennis elbow?
what is its clinical name?
cause?
it is the inflammation and pain around the lateral epicondyle
clinical name? lateral epicondylitis
cause? over use of wrist extensors
what is golfer’s elbow?
what is its clinical name?
cause?
inflammation and pain around the medial epicondyle
medial epicondylitis
caused by the overuse or hyperextension of wrist flexors
what method can be used to prevent either golfers/ tennis elbow?
stretching of the tendons, hence doing movements in the opposite direction
what are the muscles that compose the deep layer of the posterior compartments of the forearm?
- extensor pollicis longus
- extensor pollicis brevis
- extensor indicis
- abductors pollicis longus
what is the common origin of the muscles of the deep layer of the posterior compartment of the forearm?
posterolateral ulna and interosseous membrane
extensor pollicis longus
insertion
insertion: distal phalynx of digit 1
extensor pollicis brevis
insertion
insertion: proximal phalynx of digit 1
extensor indicis
insertion
function
insertion: distal phalynx of digit 2
function: accessory extension of index
abductors pollicis longus
insertion
function
insertion: base of metacarpal 1
what is the brevis sandwich composed of?
one brevis tendon between 2 longus
-medial 2 are extensorys
-lateral is an abductor
(abductor policis longus, extensor policis brevis, extensor policis longus)
how is the anatomical snuff box created?
by the muscles forming the brevis sandwich
what are the tendons that can be observed on the dorsal side of our hands?
these are the tendons of extensor digitorum
how many tendons do digits 2 and 5 have?
digits 1, 3,4?
digits 2 and 5 have 2 tendons each the others only have one
synovial sheaths are located on which tendons?
extensor tendons
what provides blood to the antero-postero-medial muscles of the forearm?
ulnar A
what does the common interosseous artery split into?
into the posterior and anterior interosseous A.
what provides blood to the antero-postero-lateral muscles of the forearm?
the radial A
what does the posterior interosseous A supply?
it supplies muscles of the deep posterior compartment
what does the anterior interosseous A supply?
supplies the deep muscles of the anterior compartment
relative to the thumb where does the radial A travel?
posterior to the thumb and within the anatomical snuff box (overtop)
what does the median nerve innervate in the forearm?
anterior comaprtments of the forearm except for the medial half of FDS and flexor carpi ulnaris
where does the median nerve travel in the forearm?
in between FDS and FDP
what muscles does the anterior interosseous N innervate?
the deep muscles which include the lateral half od FDP, flexor policis longus and pronator quadratus
what muscles are innervated by the ulnar nerve?
flexor carpi ulnaris and the medial half of FDP
the anterior interossoeous N is a branch of which major nerve?
of the median nerve
what does the deep radial nerve innervate in the forearm?
it provides the motor innervation to the extensor/posterior compartment of the forearm
what muscle is pierced by the deep radial N?
supinator
what nerve travels deep to the brachioradialis?
the superficial radial nerve
which muscles of the forearm are not innervated by the deep radial nerve, but by the radial N instead?
- extensor carpi radialis
- brachioradialis
wrist drop represents dammage to what nerve?
dammage to the radial nerve as extension cannot be accomplished
what myotome allows for forearm suppination?
trick?
C5-C6 i flick my wrist
what myotome allows for forearm pronation?
C7-C8 the time is late
what myotome allows for wrist flexion/extension?
C6-C7 fly up to heaven
