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TOPIC: Pelvic Limb

Pelvic Limb 30 Apr 2011 21:30 #1

True/False, or thoughts.

In the Pelvic Limb the SDFM/SDFT flexes the digit?
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RE:Pelvic Limb 01 May 2011 00:37 #2

  • Rick Burten
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Jaimee the shoer wrote:
True/False, or thoughts.

In the Pelvic Limb the SDFM/SDFT flexes the digit?
If they did not, why would they be called 'Flexor"? :confused:
Rick Burten PF

In the immortal words of Ron White: "But let me tell you something, folks: You can't fix S-tupid. There's not a pill you can take; there's not a class you can go to. S-tupid is forever."
."


Je pense donc je suis
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RE:Pelvic Limb 01 May 2011 01:07 #3

Rick Burten wrote:
If they did not, why would they be called 'Flexor"? :confused:

Is that a round about way of saying "true"? or is that an honest question?
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RE:Pelvic Limb 01 May 2011 01:28 #4

  • Rachael Kane
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Are you referring to the Reciprical apparatus - meaning when one joint flexes or extends, they all must? If so, the main components are the superficial flexor tendon caudally, which connect the distal femur to the calcaneus process, and the peroneus tertius cranially, which runs from the lateral condyle of the femur and inserts into the 4th tarsal and proximal cannon.
If not, it is worth knowing anyway :).
Rachael :)
CF

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RE:Pelvic Limb 01 May 2011 01:56 #5

Rachael Kane wrote:
Are you referring to the Reciprical apparatus - meaning when one joint flexes or extends, they all must? If so, the main components are the superficial flexor tendon caudally, which connect the distal femur to the calcaneus process, and the peroneus tertius cranially, which runs from the lateral condyle of the femur and inserts into the 4th tarsal and proximal cannon.
If not, it is worth knowing anyway :).

So what is the nature of the SDFT attachment on the calcaneus? Is it fixed so that muscle tonus of the SDFM is not transmitted distal of the calcaneus attachment? Or does muscle tonus transmit past the calcaneus, as it would with a check ligament?
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RE:Pelvic Limb 01 May 2011 03:09 #6

  • Donnie Walker
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Here is some additional information that might add to the discussion.

Illustrated Atlas of Clinical Equine Anatomy and Common Disorders of the Horse - Ronald J. Riegel, D.V.M. - susan E. Hakola, B.S., R.N., C.M.I.

"Originating from the supracondylar fossa of the femur beneath the gastrocnemius is the superficial digital flexor muscle. It inserts on the tuber calcis and on the medial and lateral eminences of the proximal extremity of the second phalanx. This muscle is mostly tendinous, although it has a greater content of muscle tissue than that of the peroneus tertious. As it extends down the leg distally, it forms a cap on the calcanean tuber. A large synovial bursa protects the expanded tendon from the distal fourth of the tibia to the middle of the tarsus. The bursa also extends proximally, between the flexor and gastrocnemius tendons in this area. Because there is little muscle tissue, the superficial digital flexor acts mechanically to flex the digit and extend the hock joint."
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RE:Pelvic Limb 01 May 2011 06:44 #7

Don't forget the support it offers as well, next to the flexing job job, a just as important task it has.

Ronald Aalders
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RE:Pelvic Limb 01 May 2011 19:48 #8

Donnie Walker wrote:
. . . This muscle is mostly tendinous, although it has a greater content of muscle tissue than that of the peroneus tertious. . .

. . . Because there is little muscle tissue, the superficial digital flexor acts mechanically to flex the digit and extend the hock joint."

My understanding of that is:

1) SDFM extends the hock, although SDFM cannot exert much tonus as it is mostly tendinous and is opposed by the PTM.

2) SDFT flexes the digit

So to answer the original question:

No-SDFM does not flex the digit in the Pelvic Limb, Muscle tonus of the SDFM actually corresponds to extension of the Digit in the Pelvic Limb.

Yes- SDFT passively flexes the digit in the Pelvic Limb synchronously with the stifle and hock.
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RE:Pelvic Limb 01 May 2011 19:55 #9

Ronald Aalders wrote:
Don't forget the support it offers as well, next to the flexing job job, a just as important task it has.

Ronald Aalders

Define "it"
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RE:Pelvic Limb 01 May 2011 20:01 #10

I think I have a better understanding now.

Rick Burten wrote:
If they did not, why would they be called 'Flexor"? :confused:

"they" meaning both SDFM and SDFT?

How can a muscle that acts to extend the hock also flex the digit with the reciprocal apparatus?
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RE:Pelvic Limb 01 May 2011 20:17 #11

  • david a hall
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[QUOTE=Jaimee the shoer;





How can a muscle that acts to extend the hock also flex the digit with the reciprocal apparatus?[/QUOTE]

If i understand this question correctly (and im not sure i do) I will point out that the hind limb works the opposite way round to the front limb, so the flexor tendon will extend the hock. Was that what you meant?
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RE:Pelvic Limb 01 May 2011 20:40 #12

David,

My understanding according to the paragraph from Donnie is SDFM extends the hock. Therefore SDFM cannot flex the Digit because of the attachment at the calcaneus and due to the reciprocal apparatus.

My last post was meant simply to solicit a response from Rick Burton,
I couldn't tell if his question was flippant or an honest question? when he stated:

"If they did not, why would they be called 'Flexor"?
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RE:Pelvic Limb 01 May 2011 21:35 #13

  • Rachael Kane
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Now you've gotme thinking... The SDFT can't 'extend' the hock - a muscle contracts and pulls on a tendon - so it would be more correct to say the extensor muscle/tendon causes Dorsi-flexion of the hock and the flexion of the foot simultaneously? The flexors are relaxed on the leg coming forward in flight then tighten when it hits the ground to propel forward.
Rachael :)
CF

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RE:Pelvic Limb 01 May 2011 21:38 #14

  • Rachael Kane
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Then ya gotta ask why the extensors are now flexing things! :D
Rachael :)
CF

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RE:Pelvic Limb 01 May 2011 22:26 #15

Rachael Kane wrote:
The SDFT can't 'extend' the hock - a muscle contracts and pulls on a tendon

I don't follow you on that one.

The SDFM and the Gastrocnemius have nearly identical insertions and origins.
In conversation wouldn't we say something like, "the main function of the gastrocnemius is to extend the hock"?

Just asking an honest question, started the thread because I was unclear.


Rachael Kane wrote:
The flexors are relaxed on the leg coming forward in flight then tighten when it hits the ground to propel forward.

Define "the flexors"

My understanding is that DDFT can't be 'relaxed' during protraction because as the hock flexes the distance from origin to insertion increases slightly. Also during protraction isn't the digit flexed?
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