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Suspensory Apparatus function / mechanism

limit hyperextension of distal limbs + energy springboard VIA stabilizing palmar side of fetlock and digital joints

suspensory apparatus present in

horse and ox

components of suspensory apparatus

interosseus, prox sesamoids and distal sesamoidian ligaments

interosseus in the ox and horse

dog - muscle on palmar metatcarpals
ox - m w/ tendinous tissue
horse - ligamentous aka suspensory ligament

interosseus attachments

prox metacarpal -> (splits) abaxial prox sesamoids
extensor branch -> CDE

extensor branch of interosseus function

from distal interosseus parts -> CDE to prevent DDF from flexing coffin joint too far

interosseus in the ox

2 fused interossei along axial borders

Proximal sesamoids

@ palmar aspect of fetlock joint

name the distal sesamoidian ligaments

superficial (straight)
middle (oblique)
deep (cruciate)
intersesamoidian ligament

superficial ligament

aka straight
from sesamoids to P1 and P2

middle ligament

aka oblique
from sesamoids -> P1

deep ligament

aka cruciate
from sesamoids -> P1

intersesamoidean ligament

joint proximal sesamoids to each other
*not officially part of suspensory apparatus but important for stability

When is the suspensory apparatus in use?

weight bearing (motion or rest)

components of stay apparatus

1) triceps m
2) dorsoscapular ligament
3) Biceps muscle
4) collateral ligaments
5) palmar carpal ligament

stay apparatus 1st step

triceps muscle gets initiates standing

stay apparatus 2nd step dorsoscapular lig

once standing weight transferred to forelimb via serratus ventralis attachment - strengthened via dorsoscapular lig

stay apparatus 3rd step

prox bicep attachment levered upwards w/ weight on prox scapula -> extends carpal and metacarpal joints.

lacertus fibrosis:

links biceps to extensor carpi radialis

4th step of stay apparatus collateral ligament of elbow

located caudal to axis of rotation -> favors extension

palmar carpal ligaments

NEEDS STABILITY
cranial pull of lacertus fibrosus -> prevent flexion of carpus. palmar carpal ligament prevents extension

Check ligaments

SDF and DDF tendons - transfers muscles transfer the force of this stretch to bone, protecting the muscle bellies/limiting hyperextension at fetlock

Musculocutaneous termination

medial cutaneous antebrachial - runs dorsally down medial antebrachium to distal metacarpal

radial termination

lateral cutaneous antebrachial - runs medial and terminates at carpus

dorsal hoof nerves

dorsal branch of medial/lateral palmar digital

palmar limb nerves

medial -> median palmar and lateral palmar
Ulnar -> palmar and dorsal branches

nerve blocks

high 4 pt (high palmar)
low 4 pt (low palmar)
abaxial sesamoidean n block
palmar digital nerve block

high 4 point blocks?

lateral and medial palmars (from median)
below carpal

low 4 pt blocks

ABOVE FETLOCK
medial and lateral palmars and palmar metacarpals
buttons as landmarks

abaxial sesamoidean n block

medial n lateral

palmar digital block

lateral and medial palmar

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