logging in or signing up muscles of mastication drparthraval Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 6359 Category: Education License: All Rights Reserved Like it (9) Dislike it (0) Added: June 23, 2010 This Presentation is Public Favorites: 6 Presentation Description No description available. Comments Posting comment... By: DrLaxmiRathee (18 month(s) ago) kindly let me download this presentation and this is going to be of great help to me i am doing a seminar about mandibular movement Saving..... Post Reply Close Saving..... 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Slide 4: Units of skeletal muscle are the muscle fibers, each of which act as a single cell having hundreds of nuclei (syncytial striated myocytes). Fibers are arranged in bundles of various sizes and pattern called fasciculi. Connective tissue fills the spaces between muscle fibres within a fasciculus where it is known as the endomyscium. SKELETAL MUSCLE Slide 5: Each fasciculus is also surrounded by a strong connective tissue sheath or perimysciun. Surrounding the whole muscle lies epimyscium. Cell membrane of muscle fibre is known as sarcolemma while their cytoplasm is called sarcoplasm. Sarcoplasm is divided into longitudinal threads or myofibrils each of 1 µm in diameter. Each muscle fiber consists of several hundred to several thousand myofibrils Muscles of mastication : Muscles of mastication Primary muscles Masseter Temporalis Lateral pterygoid Medial pterygoid Secondary or accessory muscles Digastric Mylohyoid Geniohyoid Buccinator Slide 8: There are four pairs of muscles attached to mandible, primarily responsible for Elevating Depressing Protruding Retruding Lateral movement Slide 9: They are functionally classified as: Jaw elevators: Masseter Temporalis Medial pterygoid Upper head of lateral pterygoid Jaw depressors Lower head of lateral pterygoid Anterior digastric Geniohyoid Mylohyoid DEVELOPMENT OF MUSCLES OF MASTICATION : DEVELOPMENT OF MUSCLES OF MASTICATION The muscular system develops from intra embryonic mesoderm Muscle tissues develop from embryonic cells called myoblast. Muscular component of Branchial arch form many striated muscles in the head and neck region. Muscles of mastication are derived from first brachial arch that is the MANDIBULAR ARCH. Slide 11: Lateral View Of A Four Week Embryo Showing Muscles Derived From Branchial Arches Slide 12: MASSETER Slide 14: TEMPORALIS Slide 16: MEDIAL PTERYGOID Slide 18: LATERAL PTERYGOID THE ACCESSORY MUSCLES OF MASTICATION : THE ACCESSORY MUSCLES OF MASTICATION DIGASTRIC MYLOHYOID GENIOHYOID BUCCINATOR Slide 23: DIGASTRIC Slide 25: GENIOHYOID Slide 27: MYLOHYOID Slide 29: BUCCINATOR Clinical examination : Clinical examination Masseter: Fingers are placed over the patients Zygomatic arch,Angle of mandible and body to feel the muscle. Slide 32: Temporalis: Fingers are placed over the patients temples to feel the muscle. Slide 33: Medial pterygoid: Index finger is used to touch the medial pterygoid muscle on the inner surface of the ramus. Slide 34: Lateral pterygoid: The little finger is inserted facial to the maxillary teeth and around distal to the pterygomaxillary, [or] hamular notch, to palpate the muscle. APPLIED ANATOMY : APPLIED ANATOMY APPLIED ASPECTS : APPLIED ASPECTS Slide 43: Myofascial PainWhen the nerve that is connected to the muscle becomes irritated small nodules or contractures form causing the muscle to become tight and painful. These contractures are called trigger points. Trigger points will often refer pain into distant locations. For example it is very common for jaw muscles with myofascial pain to refer pain into the teeth or ears. Slide 44: In addition to pain, muscles with myofacial pain also fatigue more easily and have decreased strength and range of motion. Headaches in the temples are usually the result of myofacial pain within the temporalis muscle, which is a jaw closing muscle. This can occur when the jaw muscles are chronically strained such as in teeth clenching or poor posture, through an acute trauma, or with nerve injury or jaw joint dysfunction. Slide 45: Temporal TendonitisThis can occur when there is chronic strain from the temporalis muscle pulling on the tendon that attaches to the mandible. This can cause sharp headaches in the temples, just to the sides of the eyes. Slide 46: Stylomandibular Ligament StrainThis is usually felt as a sharp to aching pain in the region behind the jaw bone and below the ear. It can be a result of bad bite or from a traumatic injury Trismus : Trismus Masseter Hypertrophy : Masseter Hypertrophy Slide 54: Figure 2. Intraoral view showing midline deviation during occlusion. Slide 55: Masseter muscle hypertrophy is an asymptomatic,benign enlargement of one or both masseter muscles. Etiology : Unclear, acc to several authors “emotional stress results in chronic forceful clenching of the jaws and bruxism, which cause a work hypertrophy of the muscle . “ Differential diagnosis: PAROTIDITIS, PAROTID TUMOR, LIPOMA, BENIGN OR MALIGNANT MUSCLE TUMORS, VASCULAR TUMORS, BENIGN AND MALIGNANT MANDIBLE TUMORS. TEMPORAL MUSCLE HYPERTROPHY : TEMPORAL MUSCLE HYPERTROPHY Slide 57: TREATMENT: NON-SURGICALTREATMENT MODALITIES; Reassurance, Tranquilizers or muscle relaxants, Psychiatric care and Injection of very small doses of botulinum toxin type A. Dental restorations and occlusal adjustments to correct premature contacts and malocclusions are important. Parafunctional habits must be prevented. SURGICAL TREATMENT; Surgical removal of the hypetrophied muscle, Partial removal of the muscle by modified liposuction techn ique. Therapy needs to be specifically tailored for each patient, because the etiology of this condition is multifactorial INRAMUSCULARHEMANGIOMA : INRAMUSCULARHEMANGIOMA Slide 62: Hemangiomas of skeletal muscle represent 0.8% of all benign vascular neoplasm . Of these 13.8% occur in the head and neck region , with the masseter muscle being the most common site, followed by the trapezius and sternocleidomastoid muscles respectively. ETIOLOGY: Trauma (2) Congenital (3) Hormonal factors.. TYPES Cavernous (2)Capillary (3) Mixed. The capillary type of hemangioma occurred more frequently in the head and neck region. The cavernous and mixed types occurred more frequently in the trunk and lower limbs. DIFFERENTIAL DIAGNOSIS: cysts, lymphangiomas, rhabdomyosarcomas, masseteric hypertrophy, and schwannomas. Slide 63: Many treatment modalities like cryotherapy, radiation therapy, steroid administration embolization have been advocated but the treatment of choice at present remains surgical excision MYOSITIS OSSIFICANS : MYOSITIS OSSIFICANS Slide 65: This is a benign conditon which results in reactive heterotopic bone formation, usually producing limitation of opening of the jaws. CLINICAL FEATURES: Limited mouth opening(trismus) TYPES: MYOSITIS OSSIFICANS TRAUMATICA MYOSITIS OSSIFICANS PROGRESSIVA M O ASSOCIATED WITH PARAPLEGIA M O ASSOCIATED WITH POLIOMYELITIS ETIOPATHOLOGY: MOT; Trauma leads to intramuscular hemmorhage which results in reactive heterotrophic bone formation within the muscle. T/T : Surgical removal of the abnormal mass. Slide 66: Panoramic radiograph indicating dense radiopaque mass extending from zygomatic arch to body and ramus of the left mandible. CT scan indicating a calcified mass in the left masseter muscle. CENTRONUCLEAR MYOPATHY : CENTRONUCLEAR MYOPATHY Centronuclear myopathy (CNM) is a rare form of congenital myopathy characterized by a universal involvement of the skeletal musculature leading to weakness and atrophy.Facial, masticatory, and extraocular muscles are characteristically involved Slide 68: This leads to fatty infiltration in masticatory muscles which leads to decrease in muscle mass and tone. This can lead to fibrous ankylosis of TMJ which can further lead to true ankylosis. TRETAMENT: Mouth opening exersices and surgical interventions References : References Sicher and Dubrull Oral anatomy 8th edition Snell anatomy, Clinical anoatomy by Regions 8th edition.. B. D. Chaurasia. Wikipedia. Edmar Zanoteli, MD,a Antônio S. Guimarães, DDS...Temporomandibular joint involvement in a patient with centronuclear myopathy ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY Volume 90, Number 1 Keith Da Silva, BSc,a and Louis Mandel, DDS,b ,Bilateral temporalis muscle hypertrophy: A case report OOO, Volume 102, Number 1 Eduardo Kazuo SANNOMIYA1 Marcelo GONÇALVES2 Marcelo Paraíso CAVALCANTI3Masseter Muscle Hypertrophy - Case Report, Braz Dent J (2006) 17(4): 347-350. C D Narayanan1*, Preeth Prakash2 and C K Dhanasekaran3, Intramuscular hemangioma of the masseter muscle: a case report,Cases journal. You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.