📝 “What are the Muscles of Mastication & Thier Attachments, Insertions and Movements?”

- 9.3.24

Quick Review #220 - #surgery #surgeon #doctorgallagher #oralsurgery #oralsurgeon #omfs #dentist #dentistry #dental #musclesofmastication

1. Masseter Muscle

• Attachments (Origin): The superficial part originates from the zygomatic process of the maxilla and the anterior two-thirds of the zygomatic arch. The deep part originates from the posterior third of the lower border and the medial surface of the zygomatic arch.

• Insertions: Inserts on the lateral surface of the ramus and angle of the mandible.

• Movements Produced: Elevates the mandible, contributing to jaw closure. Superficial fibers also aid in protrusion.

2. Temporalis Muscle

• Attachments (Origin): Originates from the temporal fossa and temporal fascia.

• Insertions: Inserts on the coronoid process and the anterior border of the mandibular ramus.

• Movements Produced: Elevates the mandible for jaw closure; posterior fibers retract the mandible.

3. Medial Pterygoid Muscle

• Attachments (Origin): The deep head originates from the medial surface of the lateral pterygoid plate, while the superficial head originates from the maxillary tuberosity and pyramidal process of the palatine bone.

• Insertions: Inserts on the medial surface of the ramus and angle of the mandible.

• Movements Produced: Elevates the mandible, aiding in jaw closure, and contributes to protrusion and mediolateral movements during chewing.

4. Lateral Pterygoid Muscle

• Attachments (Origin): The superior head originates from the greater wing of the sphenoid bone, and the inferior head originates from the lateral surface of the lateral pterygoid plate.

• Insertions: Inserts onto the neck of the mandibular condyle, the capsule of the temporomandibular joint (TMJ), and the articular disc.

• Movements Produced: Primarily responsible for opening the jaw (depressing the mandible), protrusion, and side-to-side movements.

5. Digastric Muscles:

• Attachments (Origin):

• Anterior Belly: Originates from the digastric fossa of the mandible.

• Posterior Belly: Originates from the mastoid notch of the temporal bone.

• Insertions: Both bellies are connected by an intermediate tendon that attaches to the hyoid bone via a fibrous sling.

• Movements Produced: The digastric muscle primarily assists in depressing the mandible (opening the jaw) when the hyoid bone is fixed. It also elevates the hyoid bone during swallowing and speech.

References:

1. Awasthi, P. N. (2018). Manual for Dental Hygienist (1st ed.). Jaypee Brothers Medical Publishers.

2. Gray, H., & Standring, S. (2016). Gray’s Anatomy: The Anatomical Basis of Clinical Practice (41st ed.). Elsevier.

3. Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2017). Clinically Oriented Anatomy (8th ed.). Wolters Kluwer.

4. Romanes, G. J. (2014). Cunningham’s Manual of Practical Anatomy, Volume 3: Head, Neck, and Brain (16th ed.). Oxford University Press.

5. ChatGPT. 2024

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