Levator veli palatini muscle Which of the following muscles of mastication is innervated by the trigeminal nerve, and acts to elevate the mandible and close the jaw or to move the mandible side to side, but has no role in protraction or retraction of the jaw? Medial Pterygoid Muscle. Its principal blood supply stems from the pterygoid branches of the maxillary artery. Lateral Pterygoid Muscle. Kenhub. These movements include: All muscles of mastication are innervated by motor fibers of the mandibular branch of the trigeminal nerve (CN V3), while the main arterial supply is derived from branches of the maxillary artery. Skeletal Muscle – Parts and Classification, Types of muscles – Skeletal, Cardiac and Smooth, Cardiovascular System – Structural Components, Components of Vascular System and Types of Circulation, End Arteries, Anastomosis and Collateral Circulation, Nervous System – Functions and Subdivisions, Autonomic Nervous System – Sympathetic and Parasympathetic, Anterior Triangle of Neck – Submental and Muscular triangles, Arm – Anterior and Posterior Compartments, Forearm- Flexor and Extensor Compartments, Conducting System and Nerve Supply of Heart, Anatomosis – Trochanteric, Cruciate , Around Knee, Coeliac trunk, Superior and Inferior Mesenteric Arteries, Pelvic viscera and Perineum-Important Questions, Development of pharyngeal Arches, Pouches, Development of Urinary Bladder and Urethra, Development of Urinary & Reproductive Systems- Exam Questions, Development of Gastrointestinal Tract and Diaphragm- Important Questions, Development of Face, Palate ,Tongue, Pharyngeal arches and Thyroid- Important Questions, Development of Cardio-vascular System-Important Questions. The major functions of this muscle are elevation of the mandible and side-to-side movements when grinding and chewing. Its anterior fibers are vertical whereas posterior fibers are almost horizontal. 1. Medial and lateral pterygoid muscles of the 2 sides contract alternately to generate side to side movements of the lower jaw as in mastication. Origin: It takes origin from the inferior border of anterior 2/3rd of zygomatic arch and medial surface of zygomatic arch. Edinburgh: Elsevier Churchill Livingstone. Standring, S. (2016). muscle لا ف àغت. The medial pterygoid is also involved in protrusion of the mandible. The medial pterygoid muscle is innervated by the medial pterygoid branch of the mandibular nerve. Muscles of mastication (temporalis - masseter - lateral pterygoid and medial pterygoid) .. ىنعي م îمعلاف ملك ميل •Origin from the skull •Insertion into ramus of the mandible •Innervation from mandibular nerve Temporalis muscle Origin: floor of temporal fossa and deep temporal fascia covering it. Is a quadrilateral shaped muscle and consists of two heads, Superficial head arises from maxillary tuberosity, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on Pinterest (Opens in new window), Click to share on WhatsApp (Opens in new window). Nerve supply:  is by massetric branch of anterior division of mandibular nerve. hyoid , thyroid cartilage . Philadelphia, PA: Lippincott Williams & Wilkins. Functional anatomy: Musculoskeletal anatomy, kinesiology, and palpation for manual therapists. The fibers from both heads merge and run posterolaterally to insert onto a shallow depression on the anterior aspect of the neck of the mandible called the pterygoid fovea. Medial pterygoid is supplied by a branch from the trunk of mandibular nerve and others are supplied by branches from the anterior division of mandibular nerve. and grab your free ultimate anatomy study guide! Facial Muscles: The facial muscles are a group of skeletal muscles lying under the facial skin & supplied by the facial nerve (cranial nerve VII) that control facial expression. Which muscle elevates the soft palate? The lateral pterygoid muscle is innervated by the lateral pterygoid branch of the mandibular nerve and vascularized by the pterygoid branches of the maxillary artery. The masseter muscle is a strong, quadrangular muscle that covers the lateral aspect of the ramus of... Medial pterygoid muscle. Netter, F. (2019). Found only in mammals, it is particularly powerful in herbivores to facilitate chewing of plant matter. All rights reserved. Last reviewed: October 29, 2020 2-Temporal fascia---- covers temporalis muscle, attached above to sup.temporal line and below to upper border of zygomatic arch. The mylohyoid muscle runs from the mylohyoid line of mandible to a median tendon, known as the mylohyoid raphe, where both parts of the muscle meet.The mylohyoid raphe continues its course and inserts on the body of hyoid bone. Is a thick quadrilateral muscle covering the lateral surface of ramus of mandible. Your email address will not be published. In addition, the temporalis muscle contributes to grinding movements by moving the mandible from side to side. All muscles of mastication originate on the skull and insert on the mandible. NERVE SUPPLY: Branch from facial nerve FUNCTION: Pulls hyoid bone upwards and backwards 50. Its anterior fibers are vertical whereas posterior fibers are almost ... Masseter Muscle. Enumerate the Muscles of Mastication. The trigeminal nerve is cranial nerve no. Action: Anterior fibers elevate the mandible and posterior fibers retract the protruded mandible. The Lateral Pterygoid, Masseter muscle, Medial Pterygoid and the Temporalis are the main muscles taking part in the process of mastication. Insertion: It is inserted on the medial surface, apex and anterior border of coronoid process of mandible. The main functions of these muscles include elevation and retraction of the mandible, and grinding food between the molars. Like the medial pterygoid muscle, the lateral pterygoid has two heads with two distinct origins. Feeling a bit overwhelmed? Actions: Elevates the mandible, closing the mouth. Would you like to test yourself and solidify your knowledge on the muscles of mastication? Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster. Origin: It takes origin from the bones forming floor of temporal fossa and temporal fascia. The medial pterygoid muscle is a quadrangular muscle situated in the infratemporal fossa. The muscles of mastication can be divided into primary and secondary groups according to whether they connect the mandible directly to the skull or if they attach to other structures in the neck, e.g. There are 4 types of muscles of mastication 1 Temporalis 2 Masseter 3 Medial Pterygoid 4 Lateral Pterygoid. The maxillary artery and V branches pass between the 2 heads. Gordana Sendic Muscles of Mastication are classified as main and accessory muscles. The four main muscles of mastication originate from the surface of the skull and they attach onto the rami of the mandible at the TMJ. Cael, C. (2010). Its muscle fibers converge anteriorly to form a tendon which runs deep to the zygomatic arch. It contains two types of fibers in it – those for muscles of mastication (branchial motor) and sensory to the face (general sensory). 54 muscles of mastication. Along with lateral pterygoid muscle it produces side to side movement of mandible. BUCCINATOR MUSCLE It is an accessory muscle of mastication, occupying the gap between mandible and maxilla forming important part of the cheek. From their points of origin, the muscle heads converge and run posterolaterally in an oblique fashion to insert on the medial surface of the mandibular ramus, close to the angle of the mandible. It is quadrangular in shape, and can be split into two parts; deep and superficial. It is composed of two heads that have two sets of origins. Additionally, some fibers insert on the joint capsule and articular disc of the temporomandibular joint (TMJ). Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014). Both heads encircle the lower fibers of the lateral pterygoid muscle. superficial and deep. Learn the attachments, innervations and functions of the masticatory muscles faster and easier with our muscle charts! Anatomy and human movement: structure and function (6th ed.). This sphincter-like muscle is located around the circumference of the mouth. The lower head of lateral pterygoid enters between the 2 heads of the medial pterygoid muscle. Muscles of mastication – Origin, Insertion, Function, Nerve and Blood supply + Dental anatomy , Human Anatomy 67 Comments The muscles which are required for mastication or chewing are known as the muscles of mastication. Kim Bengochea, Regis University, Denver, Author: The tendon then inserts on the apex and medial surface of the coronoid process, and the anterior border of the ramus of mandible. All the main muscles are supplied by branches of mandibular nerve. Origin: Upper had arises from infratemporal surface of greater wing of sphenoid and the lower head arises from the lateral surface of lateral pterygoid plate. 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