11Muscles of mastication Dr Sabreen Ahmed

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Anatomy of muscles of mastication, Dr. Sabreen Ahmed. This video we will summaries the Muscles of mastication, we will explain: • The origin of Muscles of Mastication • The insertion of Muscles of Mastication • The nerve and action of Muscles of Mastication. • masseter muscle • Origin: from the lower border of the zygomatic arch. Insertion: into the lateral surface of the ramus of the mandible. Nerve supply: nerve to masseter (mandibular nerve). Action: raises the mandible (antigravity muscle) and helps in its protrusion. • II) temporalis: Origin: from the floor of the temporal fossa as well as from the temporal fascia. Insertion: into the coronoid process of the mandible. N.B.: The anterior fibers are vertical, while the posterior fibers are horizontal. Nerve supply: temporal nerves (mandibular nerve). Action: raises the mandible (antigravity muscle). Its posterior horizontal fibers retract the mandible. • III) lateral pterygoid: Origin: arises by 2 heads: 1) Upper head: from the greater wing of sphenoid. 2) Lower head: from the lateral pterygoid plate. • Insertion: 1) Into the front of the neck of the mandible (pterygoid fovea). 2) Into the capsule and the articular disc of the temporo-mandibular joint. • Action: • a) It pulls the head of the mandible forward (opening of the mouth). • b) Protrude the mandible. • c) Side-to-side movement of the mandible (chewing). Iv) Medial pterygoid: Origin: arises by 2 heads: 1) Superficial head: from the maxillary tuberosity. 2) Deep head: from the lateral pterygoid plate and from the pterygoid fossa. • Insertion: Into the medial surface of the rarmus of the mandible,. Nerve supply: from the trunk of the mandibular nerve. Action: a) elevate and protrude the mandible. b) side-to-side movement of the mandible. • #muscles_of_mastication_anatomy

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