Some of the axial muscles may seem to blur the boundaries because they cross over to the appendicular skeleton. This system reflects the bones of the skeleton system, which are also arranged in this manner. The skeletal muscles are divided into axial (muscles of the trunk and head) and appendicular (muscles of the arms and legs) categories. Axial muscles of the head neck and back.Identify the following muscles and give their origins, insertions, actions and innervations: Check it out and learn more about bones, muscles, arteries, veins, and nerves of the neck.By the end of this section, you will be able to: Go through the following learning materials to learn more about the hyoid bone in a fun and engaging way! We also prepared a custom quiz on the neck anatomy. So, to talk about the hyoid bone function, its primary function is to support and be an anchor point for the many muscles and soft tissues of the neck. The bone is superiorly attached to the floor of the oral cavity, inferior to the larynx and posterior to the pharynx. Think you know the bones of the body? Test yourself! The body of the hyoid bone projects anteriorly (like the base of the letter U), whereas the greater horns project posteriorly from the body (the two arms of the U). You can easily find and palpate the hyoid just superior to the thyroid cartilage. Have you heard about the one bone in the body that isn’t attached to any other bones, well this is it - the hyoid bone. Superiorly - inferior belly of omohyoid muscleĬheck out these learning materials to master the triangles of the neck!Ĭonclude the topic with our article about the disorders of the thyroid gland. Omoclavicular (subclavian/ supraclavicular) triangle Inferiorly - superior belly of omohyoid muscle Inferiorly - middle one-third of clavicleĬontent: external jugular vein, subclavian artery, accessory nerve, cervical plexus, trunks of the brachial plexus Posteriorly - anterior edge of trapezius muscle Posteriorly - anterior border of sternocleidomastoid muscleĪnteriorly - posterior edge of sternocleidomastoid muscle Superiorly - stylohyoid and posterior belly of digastric muscles Laterally - superior belly of omohyoid and anterior border of sternocleidomastoidĪnteroinferiorly - superior belly of omohyoid muscle Medially - posterior belly of digastric muscle Laterally - anterior belly of digastric muscle Laterally - anterior border of sternocleidomastoid muscleĬontent: pharynx, larynx, glands, common carotid, internal carotid and external carotid arteries, internal jugular vein, facial, glossopharyngeal, vagus, hypoglossal nerves It can be subdivided into the occipital triangle and the omoclavicular triangle. Similarly, the posterior triangle is bounded by the posterior border of the sternocleidomastoid muscle, the anterior border of the trapezius muscle and the middle third of the clavicle. This triangle can be further divided into the submandibulartriangle, submentaltriangle, muscular triangle and carotidtriangle. The anterior triangle of the neck is made by the anterior border of the sternocleidomastoid muscle, the inferior border of the mandible and the midline of the neck. There are two main triangles the anterior, and the posterior, triangles of the neck. The neck triangles are actually spaces bordered by the neck muscles. But don’t worry, these triangles are not hard to remember and they are very important for understanding neck anatomy. You may be shocked that we’re mentioning triangles here, as you probably didn’t enroll in anatomy because you love maths. Infrahyoid: Omohyoid, sternohyoid, thyrohyoid, sternothyroid musclesĩ cartilages: Thyroid (1), epiglottic (1), cricoid (1), arytenoid (2), corniculate (2), cuneiform (2) cartilagesĬonsists of left and right lobes connected by a central isthmus, produces thyroxine and triiodothyronineĬonsists of a central body with paired greater and lessor horns Suprahyoid: Stylohyoid, digastric, mylohyoid, geniohyoid muscles Vertebral (1), visceral (1), vascular compartments (2)Īnterior: submandibular, submental, muscular and carotid triangles Key facts about neck anatomy Compartments This page will discuss the anatomy of the neck. So when you hear Bohemian rhapsody, you can turn your head towards that bar and maybe decide to go in and have some fun. For instance, it supports the position of the head and enables us to turn our head towards stimuli. Well, luckily, we have necks that attach our heads to our trunks, so joke's on them for saying that.īesides wearing necklaces and spraying perfume, the neck has other functions as well. Every adolescent has heard at least once “don’t forget your head somewhere!” from their parents.
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