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TOPIC: Extensor branches of the suspensory ligament

Extensor branches of the suspensory ligament 22 Feb 2010 03:25 #1

  • Alicia Thompson
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So I have been doing some dissections lately and am struck by the difference in size, density, strength, and exposure to trauma between the suspensory ligament above the fetlock and the extensor branches of the suspensory ligament.

The branches I am seeing are so thin, and flimsy compared to the suspensory ligament above the fetlocks that I have a hard time believing weight bearing capacity above and below the fetlock is the same.

Other than the insertion point below the knee I have not found any anchoring except for to fascia above the fetlock to where some load might be transfered so wonder if I am getting specimens with unusually weak extensor branches.

Another thought I had was that since the suspensory is a modified muscle with reported variability in amounts of muscle fibers within the ligament I wondered if perhaps the extensor branches have more muscle fibers so are more flaccid while still remaining strong.

Anyone able to shed some light on this?
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RE:Extensor branches of the suspensory ligament 22 Feb 2010 14:34 #2

It is completely amazing how the horse works as a whole. The suspensory, proximal to the proximal sesamoids, bifurcates or divides twice and then anchors itself to the proximal sesamoids. This anchorig effect is huge in the stability of the suspensory apparatus. The suspensory, although very important is just one of the structures that provides stability. The co lateral branches appear weak but with the help of the extensors, flexors, and sesmoidean ligaments they are able to keep the lower leg stabalized during movement. I hope this helps, hopefully someone may add to/ correct so that way I can come to a better understanding myself.
Jake Anderson
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RE:Extensor branches of the suspensory ligament 23 Feb 2010 03:49 #3

  • Alicia Thompson
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Very helpful thanks. One more question... do you think the extensor branches of the suspensory ligament provides any medial lateral stability to the pastern?
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RE:Extensor branches of the suspensory ligament 23 Feb 2010 04:17 #4

Im not sure but in my opinion I feel it does provide some stability medial to lateral but not as much as the collateral ligaments. Again there is a lot more to it that I dont understand but this is a start, hopefully someone else jumps in with more information
Jake Anderson
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RE:Extensor branches of the suspensory ligament 23 Feb 2010 12:07 #5

  • tbloomer
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mybluedanube wrote:
So I have been doing some dissections lately and am struck by the difference in size, density, strength, and exposure to trauma between the suspensory ligament above the fetlock and the extensor branches of the suspensory ligament.

The branches I am seeing are so thin, and flimsy compared to the suspensory ligament above the fetlocks that I have a hard time believing weight bearing capacity above and below the fetlock is the same.

Other than the insertion point below the knee I have not found any anchoring except for to fascia above the fetlock to where some load might be transfered so wonder if I am getting specimens with unusually weak extensor branches.

Another thought I had was that since the suspensory is a modified muscle with reported variability in amounts of muscle fibers within the ligament I wondered if perhaps the extensor branches have more muscle fibers so are more flaccid while still remaining strong.

Anyone able to shed some light on this?
Perhaps you have overlooked the weight carrying function (like up to 80% of the load below the fetlock) of the distal sesamoidean ligaments? ;)

http://cal.vet.upenn.edu/projects/grossanat/largemenu/hthlstdsl.htm




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RE:Extensor branches of the suspensory ligament 23 Feb 2010 12:23 #6

  • irishcas
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Alicia,

I don't have an answer to your question, but thought you might enjoy this (if you haven't seen it yet).

http://www.youtube.com/watch?v=AGck-JnxutM
Kim Cassidy
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RE:Extensor branches of the suspensory ligament 23 Feb 2010 15:56 #7

  • Alicia Thompson
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tbloomer wrote:
Perhaps you have overlooked the weight carrying function (like up to 80% of the load below the fetlock) of the distal sesamoidean ligaments? ;)

http://cal.vet.upenn.edu/projects/grossanat/largemenu/hthlstdsl.htm


It's on the test . . . ;)

That is embarrassing! lol I never even thought to consider ligaments attached to the sesamoids. That makes so much sense. Really beautiful engineering! Thanks.
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RE:Extensor branches of the suspensory ligament 23 Feb 2010 16:02 #8

  • Alicia Thompson
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irishcas wrote:
Alicia,

I don't have an answer to your question, but thought you might enjoy this (if you haven't seen it yet).

http://www.youtube.com/watch?v=AGck-JnxutM

Awesome!!! Thanks so much!
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RE:Extensor branches of the suspensory ligament 16 Oct 2011 13:45 #9

  • horsman_ship
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My understanding of it is the Suspensory ligament attaches to the proximal sesamoids and the extonsor branches are just part of it, so that explains the defference in thickness between the suspensory above and below the fetlock.

I would say that probably 50% of the syspensory attaches to the proximal sesamoids to prevent hyperextension of the fetlock when the horse is in motion.
Also i think the extonsor branches play an important role in the stay aparatus of the horse.

This is just my basic understanding of it but am sure there is some guys here with extensive knowledge that can add to it or correct it.
Zouhair Benjabbour
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