14. M. Masseter Temporalis (O Fig. 13.15)
Command. "Close your mouth, bite."
Apply resistance to the lower jaw diagonally downward to the right and to the left. Resist in a straight direction if diagonal resistance disturbs the temporomandibular joint. Resistance to the neck extensor muscles reinforces active jaw closing.
15. M. Infrahyoid and M. Suprahyoid
Command. "Open your mouth."
Give resistance under the chin either diagonally or in a straight direction (7 Chapter 9). Resistance to the neck flexor muscles reinforces active jaw opening.
When exercising mouth opening and closing, the skull remains still, the mandible moves in relation to the skull.
16. M. Platysma (O Fig. 13.17) Command. "Pull your chin down."
Give resistance under the chin to prevent the mouth from opening.
Resistance may be diagonal or in a straight plane as in O Fig. 13.17.
Resisted neck flexion reinforces this muscle.
17. Intrinsic Eye Muscles
Eye motions are reinforced by resisted head and trunk motion in the desired direction.
To reinforce eye motion down and to the right, resist neck flexion to the right and ask the patient to look in that direction. To reinforce lateral eye motion resist full rotation of the head to that side and tell the patient to look to that side. Give the patient a definite target to look at with your command.
Example: "Tuck your head down (to the right) and look at your right knee."
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If you weaken the center of any freestanding structure it becomes unstable. Eventually, everyday wear-and-tear takes its toll, causing the structure to buckle under pressure. This is exactly what happens when the core muscles are weak – it compromises your body’s ability to support the frame properly. In recent years, there has been a lot of buzz about the importance of a strong core – and there is a valid reason for this. The core is where all of the powerful movements in the body originate – so it can essentially be thought of as your “center of power.”