Muscles & Tendons of Distal Limb Flashcards
what do the muscles of the antebrachium affect
joints of carpus and digits
where do muscles of the antebrachium originate
from epicondyles of humerus
where is the muscle belly of the atenbrachium muscles located
in antebrachium
where is the tendon insertion of the antebrachium muscles
distal to the carpus
where is the origin and insertion of the extensory carpi radialis muscle
O = lateral epicondyle of humerus
I = metacarpal bones
where is the extensor carpi radialis muscle located
cranial aspect of antebrachium
what is the function of the extensor carpi radialis muscle
crosses dorsal aspect carpus –> carpal EXTENSOR
what is the nerve supply to the extensor carpi radialis muscle
radial nerve
where does the oblique muscle cross and why is this a useful landmark
crosses at level at carpus
useful landmark for extensor carpi radialis muscle
what muscle is this

extensor carpi radialis muscle
what is the origin and insertion of the common digital extensor muscle
O = lateral epicondyle of humerus
I = all digits (distal phalanx - extensor process)
what is the location of the common digital extensor muscle
cranio-lateral aspect of antebrachium
what muscle is this

common digital extensor muscle
what is the funciton of the common digital extensor muscle
crosses dorsal aspect carpus –> carpal extensor
crosses dorsal aspect metacarpo-phalangeal joints & interphalangeal joints –> digital extensor
what is the nerve supply to the common digital extensor muscle
radial nerve
where do the digital extensory muscle tendons insert to
dorsal aspect of limb
how many branches are there of the common digital extensor muscle tendons in the dog
4 branches (+1 to dew claw)
how many branches of the common digital extensor muscle tendons are in the horse
1 branch
attaches dorsal aspect phalanges
protected by joint capsules (bursae)
recieves suspensory ligament branches
what muscle tendon is this

common digital extensor muscle tendons
where is the origin and insertion of the extensor capri ulnaris/ulnaris lateralis muscle
O = lateral epicondyle of humerus
I = metacarpal bone + ACB
where is the location of the extensor capri ulnaris/ulnaris lateralis muscle
lateral aspect of the antebrachium
what is the function of the extensor capri ulnaris/ulnaris lateralis muscle
crosses lateral aspect of carpus
carpal extensory + flexor
depends on the position of the limb
what is the nerve supply of the extensory capri ulnaris/ulnaris lateralis muscle
radial nerve
what muscle is this

extensory capri ulnaris/ulnaris lateralis muscle
what is the origin and insertion of the flexor capri ulnaris muscle
O = medial epicondyle
O = olecranon process of ulna
I = ACB
what is the function of the flexor capri ulnaris muscle
crosses caudal aspect carpus –> carpal flexor
what is the nerve supply to the flexor carpi ulnaris muscle
median & ulnar nerves
what muscle is this

flexor capri ulnaris muscle
what is the origin and insertion of the superficial digital flexor muscle
O = medial epicondyle
I = all digits (middle phalanx)
what is the location of the superficial digital flexor muscle
caudal aspect of the limb
what is the function of the superficial digital flexor muscle
crosses palmar aspect of carpus –> carpal flexor
crosses palmar aspect of metacarpo-phalangeal joints & proximal interphalangeal joints –> digital flexor
what is the nerve supply of the superficial digital flexor muscle
median and ulnar nerves
what muscle is this

superficial digital flexor muscle
where are the superficial digital flexor muscle tendons insertions
palmar aspect of digit
how many branches of the superficial digital flexor muscle tendons are there in the dog
4 branches (1+ dew claw)
how many branches of the superficial digital flexor muscle tendons are there in the horse
1 branch
recieves accessory check ligament from radius –> proximal to carpus (limits length of tendon and protects muscle belly)
what is the function of the superficial digital flexor muscle tendons
splits to allow passage of DDFT and insters middle phalanx
what is this muscle

superficial digital flexor muscle tendons
top arrow = accessory check ligament
bottom arrow = SDFT
what muscle is this

superficial digital flexor muscle tendon
what is the origin and insertion of the deep digital flexor muscle
O = medial epicondyle
O = radius and ulna
I = all digits (palmar process distal phalanx)
what is the location of the deep digital flexor muscle
caudal aspect of limb
what is the function of the deep digital flexor muscle
crosses palmar aspect carpus –> carpal flexor
crosses palmar aspect metacarpo-phalangeal joints & both interphalangeal joints –> digital flexor
what is the nerve supply to the deep digital flexor muscle
median and ulnar nerves
what muscle is this

deep digital flexor muscle
where do the deep digital flexor muscle tendons of insertion
palmar aspect limb
how many branches of the deep digital flexor muscle tendons are there in the dog
4 branches (+1 to dew claw)
how many branches of the deep digital flexor muscle tendon are there in the horse
1 branch
what does the deep digital flexor muscle tendon recieve in the horse
accessory check ligament
what is the function of the deep digital flexor muscle tendon in the horse and where does it run
extension of carpal joint capsule
distal to carpus
limits length of tendon/protects muscle belly
what is the function of the deep digital flexor muscle tendon in the horse and dog
pass through split in the SDFT to insert to distal phalanx
horse runs over distal sesamoid
what are the extensor muscles of the distal limb
- extensor capri radialis
- extensor carpi unaris
- common digital extensor
what are the origin of the extensor muscles of the distal limb
lateral epicondyle of humerus
where are the extensor muscles located in the distal limb
cranial/dorsal aspect of limb
what is the nerve supply of the extensor muscles of the distal limb
radial nerve
what are the flexor muscles in the distal limb
- flexor carpi ulnaris
- superficial digital flexor
- deep digital flexor
what are the origins of the flexor muscles in the distal limb
medial epicondyle of humerus
where are the flexor muscles located in the distal limb
located caudal/palmar aspect of limb
what is the nerve supply of the flexor muscles in the distal limb
median and ulnar nerves
where do the extensor and flexor tendons run in the equine carpus
extensor tendons - dorsal aspect
flexor tendons - palmar aspect
run through the carpal canal
what are the boundaries of carpal canal
dorsal: palmar aspect of carpal joint capsule
lateral: ACB
palmar: palmar flexion retinaculum (sleeve of fibrous tissue encasing limb)

what are the contents of the carpal canal
deep digital flexor tendon (DDFT)
superficial digital flexor tendon (SDFT)
blood vessels & nerves

what is a tendon sheath
fluid filled
protects tendon where pass through confined spaces

what does inflammation in a tendon sheath cause
increased fluid volume/pressure
bulges proximally and distally
what is on the dorsal aspect of the equine limb
the CDE
how is the CDE held in place
by retinaculum
how are the SDFT and DDFT held in place
carpal canal
annular ligaments (fetlock and pastern regions)
length limited by check ligaments
which ligament is this

common digital extensor
which ligaments are these

annular ligaments
what tendons are on the dorsal aspect of the equine limb
the extensor tendons
what tendons are on the palmar aspect of the equine limb
SDFT
DDFT
check ligament (fuses with DDFT)
suspensory ligament (splits into 2 branches)
what are these structures

a. SDFT
b. DDFT
c. check ligament (fuses with DDFT)
d. suspensory ligament (splits into 2 branches)
what are these structures

- splints
- joint capsule (between suspensory ligament and MC/MT3)
- tendon sheath (palmar to suspensory ligament and proximal to annular ligament)
what structures are shown


what structures are shown

deep digital flexor muscle tendons
yellow arrow = accessory check ligament in horse
blue arrow = SDFT
identify the structures of the antebrachium


identify the structures of the antebrachium


identify the deep structures of the antebrachium


identify the structures


identify the major extensors and flexors of the forelimb in the dog


identify the muscles of the equine forelimb


identify the muscles of the equine forelimb


identify the structures


what are the functions of the SDFT and DDFT
provide palmar support for carpus and all distal limb joints