Myotendinous Junction: Difference between revisions
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== Introduction == | == Introduction == | ||
[[File: | [[File:Myotendinous junction structure.png|thumb|392x392px|MTJ structure]] | ||
Myotendinous junction (MTJ) is a part of the myotendinous unit, which connects muscle and tendon, and transmits forces between them. | Myotendinous junction (MTJ) is a part of the myotendinous unit, which connects muscle and tendon, and transmits forces between them. | ||
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The surface area between muscle and tendon is enlarged by foldings of tendon into muscle, and this reduces stress between the tissues. | The surface area between muscle and tendon is enlarged by foldings of tendon into muscle, and this reduces stress between the tissues. | ||
* In animals, the size and number of foldings are increased as a response to heavy training and reduced during inactivity. | * In animals, the size and number of foldings are increased as a response to heavy training and reduced during inactivity. | ||
* In humans, the muscle fibers near the MTJ show very high rates of remodeling compared to other regions of the muscle. | * In humans, the muscle fibers near the MTJ show very high rates of remodeling compared to other regions of the muscle. | ||
== Physiotherapy Implications == | == Physiotherapy Implications == | ||
[[File: | [[File:Medial view of a cadaver dissection of the gastrocnemius–soleus junction.png|thumb|Dissection of the gastrocnemius–soleus MTJ]] | ||
In a healthy adult, the MTJ is the weakest region of the myotendinous unit and for that reason it is its most commonly injured part. | In a healthy adult, the MTJ is the weakest region of the myotendinous unit and for that reason it is its most commonly injured part. | ||
The highest risk of strain occurs in large pennate muscles that cross two joints and produce large tensile forces e.g. biceps femoris, quadratus femoris, biceps brachii<ref name=":0" />. | * The highest risk of strain occurs in large pennate muscles that cross two joints and produce large tensile forces e.g. biceps femoris, quadratus femoris, biceps brachii<ref name=":0" />. | ||
* With aging there is shortening of the interdigitations with a resulting decrease in contact area between the sarcolemma and extracellular components.<ref>Wikimsk MTJ Available:https://wikimsk.org/wiki/Myotendinous_Junction (accessed 12.6.2022)</ref> | |||
== Resources == | == Resources == | ||
Revision as of 07:20, 12 June 2022
Original Editor - User Name
Top Contributors - Lucinda hampton
Introduction[edit | edit source]
Myotendinous junction (MTJ) is a part of the myotendinous unit, which connects muscle and tendon, and transmits forces between them.
The MTJ has a unique morphology with a highly folded muscle membrane filled with invaginations of collagen fibrils from the tendon. This creates an increased area of force transmission between muscle and tendon and, as a result, disperses the energy of a contracting muscle decreasing focal stress[1][2].
During muscle activity and mainly during high effort exercise, large forces are transmitted from muscle fibers to the tendon through the MTJ. It is a common location for strain injuries in sports. Most of these can be prevented by heavy eccentric exercise[2].
The surface area between muscle and tendon is enlarged by foldings of tendon into muscle, and this reduces stress between the tissues.
- In animals, the size and number of foldings are increased as a response to heavy training and reduced during inactivity.
- In humans, the muscle fibers near the MTJ show very high rates of remodeling compared to other regions of the muscle.
Physiotherapy Implications[edit | edit source]
In a healthy adult, the MTJ is the weakest region of the myotendinous unit and for that reason it is its most commonly injured part.
- The highest risk of strain occurs in large pennate muscles that cross two joints and produce large tensile forces e.g. biceps femoris, quadratus femoris, biceps brachii[1].
- With aging there is shortening of the interdigitations with a resulting decrease in contact area between the sarcolemma and extracellular components.[3]
Resources[edit | edit source]
- bulleted list
- x
or
- numbered list
- x
References[edit | edit source]
- ↑ 1.0 1.1 Radiopedia Myotendinous junction Available:https://radiopaedia.org/articles/myotendinous-junction?lang=us (accessed 12.6.2022)
- ↑ 2.0 2.1 Jakobsen JR, Krogsgaard MR. The Myotendinous Junction—A Vulnerable Companion in Sports. A Narrative Review. Frontiers in physiology. 2021;12. Available;https://www.frontiersin.org/articles/10.3389/fphys.2021.635561/full (accessed 12.6.2022)
- ↑ Wikimsk MTJ Available:https://wikimsk.org/wiki/Myotendinous_Junction (accessed 12.6.2022)
