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MUSCLES-MASTICATION

Anatomy-Head

MUSCLES-MASTICATION

1. MASSETER - arises from the zygomatic arch via 3 heads which are fused on the arch. Inserted into a wide area: from the angle of the mandible in the lower border to the ramus of the mandible in the upper border. Supplied by the mandibular nerve. Closes the jaw by drawing forward the angle of the jaw. The masseteric nerve runs b/w the deep + intermediate parts, the branch of the STA runs b/w the superficial + intermediate parts.

2. MEDIAL PTERYGOID - arises via 2 heads. Deep head - arises from the medial surface of the lateral pterygoid plate + pterygoid fossa. Superficial head - arises from the tuberosity of the maxilla + pyramidal process of the palatine bone. Inserted into pterygoid process on the inner surface of the mandibe. Supplied by a branch of the mandibular nerve. Elevates + protrudes the mandible.

3. LATERAL PTERYGOID - arises via 2 heads. Upper head - runs from the infratemporal surface of the sphenoid to the articular disc of the TMJ. Lower head - larger, runs from the pterygoid process of the sphenoid to the condylar process of the mandible. Supplied by a branch of the mandibular nerve. Bilateral activation causes opening and protrusion of the jaw by drawing the condyle and articular disc forwards (bilaterally).

4. TEMPORALIS - arises from the temporal fosa + temporal fascia. Its thick tendon inserts at the coronoid process of the mandible. Supplied by a branch of the mandibular nerve. The anterior fibers produces protrusion of the mandible. The posterior fibers retract the mandible. Activation of the entire muscle causes elevation of the mandible.


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REFERENCES

1. Mcminn. (2003). Last's Anatomy. Elsevier Australia. ISBN:0729537528. Read it at Google Books - Find it at Amazon
2. Netter, F. H. (2019). Atlas of human anatomy. Philadelphia, PA: Elsevier.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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