Jaw

3 Jaw




Orientation and general presentation (Figs 3.1 & 3.2)


The jaw bone (or mandible) results from the fusion of two bony elements, the junction of which is found at the level of the mental protuberance (JMP), located on the anterior aspect of the bone. Above JMP, both lower central incisors indicate the upper limit of the junction (JIN). Each jaw side shows a horizontal part, or body (1), that is shared by both fused bony elements. A vertical branch, or ramus (2), is located on each side of the body. Each jaw angle (JAN) (or gonion) is located at the intersection of the inferior crest (3) of the jaw body and the posterior crest (4) of the ramus. The anterior part of the inferior crest (JIC) is located below JMP.


image

Figure 3.1 Jaw (3D model).


A Anterior view. B Laterosuperior view.


image

Figure 3.2 Jaw (anatomic specimen). A Anterior view. B Lateral view.



Jaw – ANgle (JAN)[R,L] ISB H|Anim



Landmark JAN


This angle is at the intersection of the (horizontal) jaw body and the (vertical) ramus (see Figs 3.1 & 3.2).



image image The palpator stands slightly behind the sitting subject.


Place one forefinger on the lower edge (dotted red line) of the jaw body (dotted blue line).


The forefinger follows this edge backwards (green arrow).



image image An angle is met at the posterior aspect of the body (the ramus is above this angle).


The point to locate is the center of the angle.




Manual palpation tip



• This angle may be less sharp in elderly subjects, and therefore more difficult to palpate.

• If this is the case, be sure to select the point located at the intersection between the ramus and jaw body.

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Sep 9, 2016 | Posted by in MANUAL THERAPIST | Comments Off on Jaw

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