📝 “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 #musclesofmastication1. 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#podcast #podcasts #dentalpodcast #dentalpodcasts #doctorgallagherpodcast #doctorgallagherspodcast #doctor #dentistry #oralsurgery #dental #viral #dentalschool #dentalstudent #omfs #surgeon #doctorlife #dentistlife #residency #oralsurgeon #dentist #doctorgallagher