The Right TMCC Pattern
The Right TMCC pattern is the neck pattern that is described in excrutiating detail by the Postural Restoration Institute in their course called Cervical Revolution. At its most basic manifestation, the Right TMCC pattern is one where the cervical spine is oriented to the right with your head counter-rotating back to the left.
In this respect it is exactly like the Right Brachial Chain pattern that also consists of a spine oriented to the right with a ribcage counter-rotating back to the left.
This is why understanding the right tempo-mandibular cervical chain of muscles is so important in a training context. While the R TMCC muscles connect the head and neck and control its movement, it also greatly influences the torso and potentially the pelvis.
The main job of the right TMCC is to turn your head to the left when you are on your right foot, but it also:
– provides support for the scapula.
– provides stability for accessory muscles of respiration.
– controls the range of cervical rotation, lateral flexion, and sagittal plane activity of the neck and head.
– controls the motion of the mandible. This is critically important, particularly to dentistry, yet virtually no one pays any attention to it.
The mechanics of the cervical spine are really quite intricate and it’s almost impossible to convey proper neck movement over a blog post. So I will just touch on some important aspects of this R TMCC chain of muscles and how it effects the the parts of the body that we deal with in strength and conditioning: the torso and pelvis.
Rigth TMCC Influence on the Torso
In a training context, the main reason we need to understand the role of the right TMCC is because there are a few muscles of this chain that will prevent the attainment of full neutrality of the rib cage and pelvis if we can’t shut them off.
They are the right scalenes and the right SCM (sternocleidomastoid).
Technically, the scalenes are part of the Right Brachial Chain in PRI nomenclature, but practically speaking, they do influence the head via their respiratory influence on the right upper ribs and sternum. In the right TMCC pattern, these two muscles are active in attempting to sidebend the neck to the right while the SCM also becomes quite active in turning the head to the left.
The right scalenes, which run from the cervical vertabrae down to the first two ribs, will often attempt to pull the ribcage up on the right side to facilitate air-flow that has been compromised by the torso’s counter-rotation to the left. In this counter-rotated position of the torso, the upper right chest area is compressed, and no longer expands upon inhalation.
Thus, with right chest wall expansion compromised, the scalenes try to help out by lifting the right rib cage up. While it’s nice that scalenes try to help out, it’s not a desirable state of affairs because it will throw off proper neck mechanics.
The SCM runs from just behind our ears, at the mastoid process of our temporal bones at the base of the skull, to our sternum. They are big and they are strong. They primarily function to sidebend (laterally flex is what PRI calls it. Sidebend is used for cranial torsion patterns) our neck and rotate our head to the opposite side. So my right SCM will laterally flex my neck to the right and rotate my head to the left.
The SCM will also play a huge role in forward head posture. In this regard, you can think of it as the hip flexors of the neck. It will hold the base of the neck in flexion. While it’s probably not the muscle that is putting you in to a forward head posture, it will be a primary muscle to hold you in that forward head posture once you are already there.
That right SCM also has an outsized role in the right TMCC pattern due to its influence on the right temporal bone. Discussion of temporal bones and the rest of the cranium is where things get really complicated, so I am only going to briefly mention them.
In the right TMCC pattern, the right temporal bone is stuck in a position of internal rotation (IR). The right SCM is a main player in this IR position. When it gets put in a position in which it never turns off, it will IR the right temporal bone as it pulls on the mastoid process. This pull keeps the right temporal bone internally rotated.
If breathing is compromised by a restricted Right Brachial Chain so that our right chest wall will not expand sufficiently upon inhalation, it is likely that we will have a spine that is oriented to the right.
The right scalenes and SCM are forced to kick in to help us breathe by attempting to pull the ribcage up on the right side (if it can’t expand, where else can it go but up?).
In this case the right SCM will become overactive and the right TMCC pattern is more likely to develop.
Practically speaking, if brachial chain neutrality is what we are after, it may be impossible to achieve if someone has developed a strong R TMCC pattern and thus have a right SCM and scalenes that won’t shut off.
I ran into this problem numerous times, not only with others but also myself.
No matter what brachial chain inhibition technique I used, I couldn’t get full neutrality. Learning about the influence of the RTMCC pattern made me realize that I wasn’t doing anything incorrectly, it was just that I didn’t yet understand the whole system.
Understanding how to turn off an overactive R TMCC now enables me to usually get full neutrality in the brachial chain.
Interestingly, it is possible that someone could have a R TMCC pattern that is “weak”. What I mean is that someone could be in that pattern yet you never have to do anything specific for it. It’s not infrequent that just doing a pelvis repositioning technique will also shut off the right brachial chain and the right TMCC at the same time.
Other times, particularly if there is a vision, occlusion issue, or history of physical/emotional trauma/abuse or whiplash, the RTMCC pattern might be “stronger” and more difficult to turn off.
In that case, you may experience a lot of frustration when all your Left AIC and R BC techniques don’t seem to be working or just won’t stick. It could be the RTMCC that is interfering with the process.