File Name: muscles of mastication origin and insertion .zip
A comprehensive collection of clinical examination OSCE guides that include step-by-step images of key steps, video demonstrations and PDF mark schemes. A comprehensive collection of OSCE guides to common clinical procedures, including step-by-step images of key steps, video demonstrations and PDF mark schemes. A collection of communication skills guides, for common OSCE scenarios, including history taking and information giving. A collection of data interpretation guides to help you learn how to interpret various laboratory and radiology investigations. A comprehensive collection of medical revision notes that cover a broad range of clinical topics. A collection of anatomy notes covering the key anatomy concepts that medical students need to learn.
The motor root of the trigeminal nerve runs close to the sensory root and receives considerable radiation during Gamma Knife radiosurgery GKRS for trigeminal neuralgia TN. Changes in the muscles like fatty infiltration, MRI signal, or atrophy were noted. Among the 68 patients eligible for inclusion in the study, temporalis muscles, medial pterygoid muscles, lateral pterygoid muscles, and masseter muscles were assessed. A subset of patients was found to have muscle atrophy even prior to GKRS. Reversal of atrophy of these muscles occurred after GKRS in a majority of the patients. The incidence of new-onset permanent post-GKRS muscle atrophy was 1. The median follow-up was 39 months range 6— months.
The masseter muscle is the most powerful muscle of mastication. The entirety of the muscle lies superficially to the pterygoids and temporalis, covering them. Attachments: The superficial part originates from maxillary process of the zygomatic bone. The deep part originates from the zygomatic arch of the temporal bone.
Langenbach, Joannes A. Korfage, Andrej Zentner, Theo M. Jaw muscles are versatile entities that are able to adapt their anatomical characteristics, such as size, cross-sectional area, and fibre properties, to altered functional demands.
By the end of this section, you will be able to identify the following muscles and give their origins, insertions, actions and innervations:. The skeletal muscles are divided into axial muscles of the trunk and head and appendicular muscles of the arms and legs categories. This system reflects the bones of the skeleton system, which are also arranged in this manner. Some of the axial muscles may seem to blur the boundaries because they cross over to the appendicular skeleton. The first grouping of the axial muscles you will review includes the muscles of the head and neck, then you will review the muscles of the vertebral column, and finally you will review the oblique and rectus muscles. The muscles of facial expression originate from the surface of the skull or the fascia connective tissue of the face. The insertions of these muscles have fibers intertwined with connective tissue and the dermis of the skin.
The muscles of mastication are associated with movements of the jaw temporomandibular joint. They are one of the major muscle groups in the head — the other being the muscles of facial expression. There are four muscles:. The muscles of mastication develop from the first pharyngeal arch. Thus, they are innervated by a branch of the trigeminal nerve CN V , the mandibular nerve. In this article, we shall look at the anatomy of the muscles of mastication — their attachments, actions, and innervation. The masseter muscle is the most powerful muscle of mastication.
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