What’s Tendonitis?
For an extended time it was thought that a tendon and also the fascia of its corresponding muscle have been all one continuous piece, because both are fibroblastic tendon cells, and simply because every single fascicle in the muscle belly is identical to the fascicles within the corresponding tendon. With the advent of the electron microscope nonetheless, we had been in a position to see that muscle endomysium is a separate entity with its personal desmosome; i.e. the connective tissue, or fascia that wraps the muscle just isn’t the identical tissue as the tendon issuing from the muscle, although they are the similar sort cells.
The Golgi tendon organ attaches to the tendon just at this point of union in between the muscle and tendon. The GTO is actually attached to what has been, within the muscle, the endomysium surrounding the individual cell (except, as stated above, at that point the endomysium has run out along with the tendon begun). On the other hand, the distinction of the endomysial layers across the muscle fibers, and also the perimysial layers around the fascicles (which just isn’t attached to the muscles, but forms a sheath around them), continues within the tendon. Thus, tendons have the same logistical separation into fascicles as do muscles, for the same logistical causes. Many book illustrations do not depict the endomysium – they show nothing around every of the individual muscle fibers, nor do they show the desmosomes separating muscle from tendon. Instead most show the tendon attaching directly to the muscle fibers, which is just not possible.
It can be normally said that the although the muscle spindle is in parallel using the muscle, the Golgi organ is in series with it; really, both the spindle and Golgi organ are in parallel. The muscle spindle is attached to the side of the perimysium, whereas the Golgi organ is attached to the side of the endomysial layer of the tendon. For that reason, the Golgi organ is truly in parallel with the tendon that occurs to be in series using the muscle. Incidentally, “in parallel’ and ‘in series’ are anatomical designations, as opposed to neurological.
It really is the tendon which is struck when checking tendon reflexes. And striking a tendon reflex point – knee, elbow, ankle – doesn’t activate a Golgi tendon organ. It can be usually mistakenly thought that the term “tendon reflex” refers to activating the Golgi tendon organ, but Golgi organs basically inhibit instead of trigger muscle contraction; it’s the muscle spindle bag fibers which trigger muscle contraction through the myotatic stretch reflex.
Within the case of the knee tendon reflex, the Golgi organ is located above the knee, inside the deflective portion at the end of the muscle belly; striking there would generate only a local action from the deflection of the giving fibers of the muscle. But striking just beneath the patella is striking the much less deflective tendon, which activates the whole muscle. And since we know that Golgi organs inhibit contraction, an erroneous assumption exists in some camps that grinding away on the Golgis will loosen up muscle in spasm. But actually, 1 can not gnarl the Golgis devoid of activating the muscle spindles (stretch reflex).
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