Lab 15 and 16 The Digit and Hoof, Passive Stay Apparatus summary Flashcards
layers of the hoof wall
- stratum externum
- stratum medium
- stratum internum
cartilages of the hoof
-sagital plates attached to palmar processes of PIII and projecting a little above the hoof
digital cushion
- yielding nature
- during overextension of the fetlock this is compressed between PII and the frog and the fusion presses against the cartilages and promotes outward movement of the quarters
- found deep to bulbs of the heels and the frog
coronary cushion
same as coronary dermis? Thes is a dermal component of the hoof that bulges out, located between perioploic dermis and laminar dermis
bulbs of the heel
just the superficial portion of the heel; its the bulb
ligaments associated with proximal sesamoid bones
- palmar ligament
- palmar annular ligament
ligaments associated with the distal sesamoid bones
- collateral sesamoidean ligament
- impar ligament
other name for collateral sesamoidean ligament
proximal navicular ligament
other name for impartial ligament
distal navicular ligament
annular ligament
is a thickening of the deep fascia, has different names depending on location
- palmar annular ligament
- proximal annular ligament
- distal annular ligament
- digital tendon sheath surrounds flexor tendons, lies deep to the different regions of annular ligament
if digital tendon sheath bulges
may be seen in specific regions of the digit
Components of suspensory apparatus
- body of the suspensory
- medial and lateral suspensory branches
- extensor branches
- distal sesamoidean ligaments
when is suspensory apparatus action most visible in fetlock
during extreme overextension; at moment of impact thrust of MC3 borne largely by sesamoid bones and palmar ligament and suspensory ligament is under great tension
medial and lateral suspensory branches
in distal 1/3rd of cannon bone, attach to proximal sesamoid bones
body of the suspensory
proximal aspect arises form dorsal row of tarsal or carpal bones
extensor branches of suspensory
attach to extensor tendons, run along sides of digits
distal sesamoidean ligaments
- straight
- oblique
- cruciate
straight sesamoidean ligaments
sesamoids attach to P2
oblique sesamoidean ligament
sesamoids attach to P1
cruciate sesamoidean ligament
sesamoids attach to P1
fetlock, pastern, and coffin joints
have dorsal, palmar (or plantar) pouches
superficial regions of hoof
- wall
- sole
- heel
- frog
- bulbs
- toe
- quarters
parts of frog
- paracunean or collateral grooves
- central sulcus
paracunean grooves
separate the bars from the frog
central sulcus of frog
the indent in the top/ middle of the frog
cartilages of hoof fx
facilitate slight expansion of hoof at the quarters when weight is placed on the limb
holes in cartilages of the hoofo
transmit veins of venous plexsus present in hoof dermis
digital cushion location
- wedge shaped mass of fibrous adipose tissue
- is related to frog distally
- related to deep flexor tendon proximally
- related to cartilages of hoof medially and laterally
- cd portion if partly SQ and divided by central depression into two bulbs of cushion
- bulbs of cushion underlie bulbs of the heels
suspensory aka
interosseus
suspensory attaches to
- arises from distal row of carpal bones and proximal end of Mc3; passes distally applied to palmar surface of that bone and divides into two branches proximal to fetlock
medial and lateral branch of the suspensory ligament
attaches on abaxial hollowed surface of the medial sesamoid bone, sends thing extensor branch dorsodistally over the fetlock to common extensor tendon
extensor branch of suspensory
medial and lateral branch of the suspensory ligaments send thin extensor branch dorsodistally over the fetlock to the common extensor tendon
suspensory ligament components
body, medial and lateral branches, extensor branches, distal sesamoidean ligaments (straight, oblique, and cruciate)
