The newest analogy i included in lecture requires the extensor digitorum longus (EDL), a muscles which crosses this new ankle, subtalar combined (STJ), and you can, actually, most of the combined as much as the fresh new Dip combined.
To indicate a pure illustration of probably the most unfathomable and you may harmful cooperation of details is the conceptual idea of individual matchmaking
The latest EDL tend to operate on every of those joints, dorsiflexing brand new ankle, pronating the brand new subtalar combined, upcoming stretching the fresh new MP, PIP, and you may Dip joints.
Yet not, when we utilize the EDL itself, it is going to move new ankle, STJ, etcetera. Whenever we must extend the fresh new toes in the Dip joint and never flow other mutual, we need to stimulate several other muscles, good synergist, also the EDL.
Which synergist is always to avoid the new EDL during the both the foot and you can STJ. Given that EDL dorsiflexes the newest foot and you can pronates the fresh STJ, the fresh syngergist should plantar bend the brand new foot and supinate the STJ. A muscle tissue and this performs this ‘s the tibialis posterior. Ergo, new EDL while the tibialis posterior act within the a true cooperation to increase the brand new Drop joints in place of swinging the brand new foot and you will STJ.
(Observe that new flexor digitorum longus plus plantar flexes the fresh ankle, and you will supinates the newest STJ. It could perhaps not work for this action, not, since it and crosses new PIP and you will Drop bones. Actually, it might be an antagonist into EDL.)
ANTAGONISTS
Body with opposite measures in the a mutual is antagonists. Seen inside the a specific flat of movement, the new human anatomy whose contours away from application are on contrary edges regarding a joint axis is antagonists.
We should not contemplate human anatomy as actually structured into the agonist-antagonist pairs. We won’t find it useful, such as, to try and name a keen antagonist per strength. Instead, provided a functional path, we want to contemplate muscles in terms of useful communities and that has opposite procedures.
Antagonists fundamentally settle down whenever agonist serves. Cocontraction or, to use an expression I prefer, coactivation, occurs when body on the both parties from a shared axis try effective. We often coactivate body when we manage unlearned otherwise unique moves. I also coactivate body when we manage enabling otherwise true synergies.
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