Posted on 17 Nov 2010 15:48
By Ground Up Strength
The temporalis muscle is a large, thin fan-shaped muscle located in the side of the skull above and in front of the ear. It is a muscle of mastication and its role is similar to the masseter, which is to elevate the mandible (lower jaw) and so close the mouth. Although the masseter is the more powerful muscle the temporalis is an important chewing muscle. It starts at the temporal bone of the skull but passes all the way down beneath zygomatic arch (cheek bone), attaching to the mandible, enabling it to assist the masseter in closing the jaw but also to retract the mandible.
If you place your fingers just above your ear while clenching and unclenching your jaw you will be able to feel the temporalis at work. In fact this is a good idea because if you clench your jaw very tightly you will feel a very powerful contraction in the temporalis, showing just how hard this muscle can work. Muscles of the face and head are easily overlooked yet they are some of the busiest muscles in the body. Especially overworked are the muscles of mastication, like the temporalis, which not only work while we chew but may sometimes be continuously called on during periods of stress when we habitually clench or grind out teeth. This is referred to as bruxism. The temporalis, in fact, is likely to be involved in jaw pain of myofascial origin and also with headaches.
Temporalis Video Presentation
Temporalis Origin, Insertion, and Action
Origin: Temporal fossa between inferior temporal line (of parietal bone) and infratemporal crest.
The Temporalis Muscle
Insertion: Coronoid process of the mandible and anterior ramus of the mandible.
Action: Elevates mandible (closes jaw) and retracts mandible (horizontal fibers of posterior part of muscle).
Temporalis Trigger Points Causes and Symptoms
The temporalis is commonly associated with TMJ problems both of myofascial pain origin and other. As mentioned above, bruxism and teeth clenching can activate trigger points in the muscle or trigger points in the muscle can bring about bruxism. Whatever the case, the muscle becomes overworked and strained. An impact of any kind against the side of the head in the temporalis area can also cause trigger points to occur. Note that trigger points can be, and usually are, self sustaining. They can persist long after the offending incident or injury has resolved. This, in fact, is one of the most important things to remember about trigger points: unless they are treated they are self-perpetuating.
TP's can occur because of dental work or jaw work that requires long periods of jaw immobilization or during cervical traction for neck pain. Often, the trigger points caused by these procedures add to the pain symptoms iherent to the original problem leading to further unnecessary work. So for instance, extensive dental work leads to trigger points in the temporalis muscle. These trigger points add to the face pain and toothache leading to the mistaken assumption that further dental work is needed which of course only worsens the problem. For these problems any muscle of mastication including the temporalis and masseter and any neck muscles of postural control such as the sternocleidomastoid, can be related. Neck pain cause from TrP's in the upper trapezius, for instance, may lead to faulty treatments for the cervical spine, these treatments leading to even more trigger points in the masticatory muscles, etc. Forward head posture, like with many other muscles, can also lead the TrP's in the temporalis.
Other causes are excessive gum chewing, a cold draft of air on the side of the head (as when driving with an open car window in winter), and anything that causes the teeth not to meet properly or displaces the jaw, such as dental work or related jaw problems. Abscesses in teeth or jaw inflammation may lead to TrP's in the temporalis. Chronic mouth breathing may be a culprit as well. Also, as stated, trigger points in the sternocleidomastoid, masseter can set up satellite TrP's here. Trapezius trigger points may also spread problems to the temporalis.
Temporalis TrP's are associated with head-pain and are a clinical feature of tension type headace of myofascial origin (myogenic headache). They refer pain to the ipsilateral head, sometimes to the front of the head over the eyebrow, and to the face and upper teeth. See the image below for these referred pain patterns. Headache sufferers often report that the pain from temporalis TrP's occurs inside the head. Other muscles that refer pain to the head and are a clinical feature of tension headache are the upper trapezius, sternocleidomastoid, suboccipital, splenius capitus and cervicus, and others.
Sometimes pain can be felt in the side of the face in general, which can be felt as a diffuse jaw pain. It is possible for the pain to extend anywhere from the side of the chin all the way to the postolateral neck region, with much of the pain being concentrated in the side of the head or the temple region, above and/or slightly posterior to the trigger point. Temporalis TrP's can also cause pain and heat and cold sensitivity in the upper teeth and gums. Temporalis TrP's are a feature of TMJ problems (TMD) as mentioned above and prolonged TrP's in the temporalis and masseter muscles can permanently damage the jaw. Increased tear production in the adjacent eye has also been reported.
Temporalis Trigger Points and Referred Pain
Self Treatment for Temporalis Trigger Points
Locate the tender point and massage with even strokes with supported fingers. It may be helpful to open the mouth slightly. Alternatively, apply pressure to the trigger point while opening the mouth wide. Repeat several times and move on to the next trigger point. Be sure to find and treat other associated trigger points as covered in this article. Heat application may be helpful for temporalis TrP's as well.
This "Temporalis Muscle: Location, Action and Trigger Points" page is provided by Ground Up Strength for information purposes only and should not take the place of professional medical advice. Although we have done our utmost to provide accurate and safe information, we are not medical professionals and the information on this page should not be taken as professional medical advice, or any other kind of medical advice. Any self-treatment undertaken by you is undertaken at your own risk.
Unless otherwise noted, all images on this page used under license. Images by LifeART (and/or) MediClip image copyright 2010. Wolters Kluwer Health, Inc.- Lippincott Williams & Wilkins. All rights reserved. Images not for reuse.
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This page created 17 Nov 2010 15:48
Last updated 23 Feb 2015 20:04