If you&;ve got headaches, tooth ache or neck pain that won&;t seem to go away even with treatment? Did you know your jaw could be the cause?.The Digastrics. .The Digastric muscles – by definition this double bellied muscle is a small muscle underneath the jaw – There are two bellies of the digastric: Posterior belly – attaches to the lower part of the skullAnterior belly – inner side of the mandible and the hyoid bone – a cartilaginous structure in your neckThis muscle helps you with swallowing and depressing the jaw. In patients with TMD, often the posterior belly of this muscle is tight.To muscle test it:.Put your fingers in the corner of your jaw and press forward and toward your eyes.If you swallow and feel this muscle pop – you&;re on the right spot.If you don&;t quite feel this one – don&;t worry. It&;s a smaller muscle which blends with a number of muscles into the front of the neck and is quite a tender point! Some practitioners themselves find difficulty muscle testing this on their patients. I just wanted to show you as much as I could for self treatment – This is number 3 of 4 so only one more!. Next up is the self release for it. series