Muscle:Masseter - Revision history

Yatreyu: /* Mandibular Range of Motion */

2026-04-14T11:51:19Z

Mandibular Range of Motion

← Older revision		Revision as of 04:51, 14 April 2026
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	Normal interincisal opening is 36–44 mm. A practical bedside test:		Normal interincisal opening is 36–44 mm. A practical bedside test:

	* Patient should be able to pass '''two or even three of their own knuckles''' between the upper and lower ~~teeth~~		* Patient should be able to pass '''two or even three of their own knuckles''' between the upper and lower teeth. Very few patients with active masseter TrPs can pass three knuckles.
	* A more critical test: the '''distal phalanges of the first three fingers''' placed between the incisor teeth. Very few patients with active masseter TrPs can pass three knuckles.

			* A more critical test: the '''distal phalanges of the first three fingers''' placed between the incisor teeth.
	Masseter TrPs can cause significant restriction of vertical opening. Observe the path of opening and closing:		Masseter TrPs can cause significant restriction of vertical opening. Observe the path of opening and closing:

2026-04-14T11:50:19Z

← Older revision		Revision as of 04:50, 14 April 2026
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	Because the mandible spans both sides of the cranium, unilateral masseter dysfunction has biomechanical effects on the contralateral side. Unilateral TrPs tend to deviate the mandible toward the affected side, and this deviation is most apparent when the patient slowly opens and closes the mouth — a presentation similar to unilateral TMJ internal derangement.		Because the mandible spans both sides of the cranium, unilateral masseter dysfunction has biomechanical effects on the contralateral side. Unilateral TrPs tend to deviate the mandible toward the affected side, and this deviation is most apparent when the patient slowly opens and closes the mouth — a presentation similar to unilateral TMJ internal derangement.

	~~{{TOC}}~~

	==Anatomy==		==Anatomy==

2026-04-14T11:50:07Z

2026-04-12T07:07:38Z

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{{Muscle stub}}
==Masseter==
See also: [[Muscle:Masseter/Superficial]], [[Muscle:Masseter/Deep]]

[[Category:Muscle]][[Category:Vol1_Ch8]]