What happens if the lateral pterygoid muscle is damaged?
What happens if the lateral pterygoid muscle is damaged?
Of the four muscles involved in mastication, the lateral pterygoid is the only muscle that also depresses, or opens, the jaw. If there is serious injury to one of the lateral pterygoid muscles which prevents it from contracting, the other lateral pterygoid muscle will still maintain contracture function.
What is the function of the pterygoid muscles?
The Lateral pterygoid muscle is active during mastication and during mandibular movements such as protrusion (forward movement of the mandible), abduction (depression of the mandible), mediotrusion (movement of the mandibular condyle towards the midline), and particularly during speaking, singing, and clenching.
How do you test a pterygoid muscle?
To palpate from outside the mouth, the head is tilted slightly to access the muscle. Palpation with one finger locates trigger points on the inner surface of the mandible by pressing upward at its angle. Palpation of the mid-belly is performed inside the mouth with the pad of the palpating index finger.
How do you get rid of pterygoid muscle?
Gently squeeze the muscle between the index finger and the thumb. Start with a gentle pressure, and gradually increase the muscle squeeze as tolerated. Teach the patient to self-squeeze the lateral pterygoid muscle for 1 minute several times per day. Relief of the headache, jaw or facial pain is sometimes immediate.
What are the two heads of the lateral pterygoid muscle?
Lateral pterygoid is located deep to the temporalis and masseter muscles, spanning between the sphenoid bone and temporomandibular joint. Its muscle belly is separated by a small horizontal fissure into two heads; superior (upper) and inferior (lower).
What is action of medial pterygoid muscle?
The medial pterygoid (or internal pterygoid muscle), is a thick, quadrilateral muscle of mastication….Medial pterygoid muscle.
| Medial pterygoid | |
|---|---|
| Actions | elevates mandible, closes jaw, helps lateral pterygoids in moving the jaw from side to side |
| Identifiers |
How do you relax a medial pterygoid muscle?
Open your jaw and slide your finger in to the inner side of that bone . The muscle is right there. Apply mild to moderate pressure and wait for it to relax. Hold until it relaxes.
How do you test for Buccinator muscle?
Bell tested buccinator muscle strength by having his patient puff out his cheeks against his fingers, noting that air escaped when the weak cheek was compressed. He had the patient laugh and with each “cachinnation the left (weak) cheek was puffed out, flapping like a loose sail” (Bell, 1830, Appendix vii–xiv).
How do you relax the tension in your mouth?
Here are three you can try:
- Manual jaw-opening exercise. Repeat small mouth-opening and mouth-closing movements several times as a warm up.
- Jaw joint stretch. This exercise helps stretch the muscles of the jaw and neck.
- Smile stretch. This stretch helps eliminate stress in the facial muscles, upper and lower jaw, and neck.
How do you inject lateral pterygoid muscle?
The needle is inserted until a hard stop at the lateral pterygoid plate is encountered (approximately 40-45 mm), at which point the needle is retracted to a depth of 30-35 mm, bloodless aspiration is confirmed, and the desired therapeutic injection is performed.
Where does the lateral pterygoid muscle come from?
The muscle is supplied by the paired nerves to lateral pterygoid (one for each head) which arise deep to the muscle from the anterior division of the mandibular nerve (CN V 3).
Can a pterygoid muscle cause a double disc sign?
Hyperactivity of the LPM muscle has been described in TMJ internal derangement, especially with longstanding anterior displacement of the disc without recapture. Thickening of the tendon (inferior part) can give rise to the ” double disc sign “. Anatomical variants of the lateral pterygoid include:
Are there any cystic lesions in the pterygoid process?
Cystic lesions of the pterygoid process are very rare; only two cases of cystic lymphangioma, one of cystic schwannoma and one of cholesterol granuloma have been reported in the pterygoid process [1], [2], [3], [4]. Such tumors evolve slowly, so that consultation is late.
Where does the inferior part of the pterygoid plate insert?
It inserts in the TMJ capsule and TMJ disc. The inferior part arises from the lateral surface of the lateral pterygoid plate and inserts into a depression in front of the neck of the condyle of the mandible; the pterygoid fovea.