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Submental Triangle
The submental triangle (or suprahyoid triangle) is a division of the anterior triangle of the neck. Boundaries It is limited to: * Lateral (away from the midline), formed by the anterior belly of the digastricus * Medial (towards the midline), formed by the midline of the neck between the mandible and the hyoid bone The hyoid-bone (lingual-bone or tongue-bone) () is a horseshoe-shaped bone situated in the anterior midline of the neck between the chin and the thyroid-cartilage. At rest, it lies between the base of the mandible and the third cervical verte ... * Inferior (below), formed by the body of the hyoid bone *Floor is formed by the mylohyoideus *Roof is formed by investing layer of deep cervical fascia Contents It contains one or two lymph glands, the submental lymph nodes (three or four in number) and Submental veins and commencement of anterior jugular veins. (The contents of the triangle actually lie in the superficial fascia over the roof of submental ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Anterior Triangle Of The Neck
The anterior triangle is a region of the neck. Structure The triangle is inverted with its apex inferior to its base which is under the chin. Investing fascia covers the roof of the triangle while visceral fascia covers the floor. Anatomy Muscles: * Suprahyoid muscles - Digastric (Ant and post belly), mylohyoid, geniohyoid and stylohyoid. * Infrahyoid muscles - Omohyoid, sternohyoid, sternothyroid, and thyrohyoid. Nerve supply 2 Bellies of digastric * Anterior: Mylohyoid nerve * Posterior: Facial nerve Stylohyoid: by the facial nerve, by a branch from that to the posterior belly of digastric. Mylohyoid: by its own nerve, a branch of the inferior alveolar (from the mandibular division of trigeminal nerve), which arises just before the parent nerve enters the mandibular foramen, pierces the sphenomandibular ligament, and runs forward on the inferior surface of the mylohyoid, supplying it and the anterior belly of the digastric. Geniohyoid: by a branch from the hypoglossa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Anatomical Terms Of Location
Standard anatomical terms of location are used to describe unambiguously the anatomy of humans and other animals. The terms, typically derived from Latin or Greek roots, describe something in its standard anatomical position. This position provides a definition of what is at the front ("anterior"), behind ("posterior") and so on. As part of defining and describing terms, the body is described through the use of anatomical planes and axes. The meaning of terms that are used can change depending on whether a vertebrate is a biped or a quadruped, due to the difference in the neuraxis, or if an invertebrate is a non-bilaterian. A non-bilaterian has no anterior or posterior surface for example but can still have a descriptor used such as proximal or distal in relation to a body part that is nearest to, or furthest from its middle. International organisations have determined vocabularies that are often used as standards for subdisciplines of anatomy. For example, '' Termi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Digastricus
The digastric muscle (also digastricus) (named ''digastric'' as it has two 'bellies') is a bilaterally paired suprahyoid muscle located under the jaw. Its posterior belly is attached to the mastoid notch of temporal bone, and its anterior belly is attached to the digastric fossa of mandible; the two bellies are united by an intermediate tendon which is held in a loop that attaches to the hyoid bone. The anterior belly is innervated via the mandibular nerve (cranial nerve V), and the posterior belly is innervated via the facial nerve (cranial nerve VII). It may act to depress the mandible or elevate the hyoid bone. The term "digastric muscle" refers to this specific muscle even though there are other muscles in the body to feature two bellies. Anatomy The digastric muscle consists of two muscular bellies united by an intermediate tendon with the posterior belly longer than the anterior belly. The two bellies of the digastric muscle have different embryological origins - the a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Human Mandible
In jawed vertebrates, the mandible (from the Latin ''mandibula'', 'for chewing'), lower jaw, or jawbone is a bone that makes up the lowerand typically more mobilecomponent of the mouth (the upper jaw being known as the maxilla). The jawbone is the skull's only movable, posable bone, sharing joints with the cranium's temporal bones. The mandible hosts the lower teeth (their depth delineated by the alveolar process). Many muscles attach to the bone, which also hosts nerves (some connecting to the teeth) and blood vessels. Amongst other functions, the jawbone is essential for chewing food. Owing to the Neolithic advent of agriculture (), human jaws evolved to be smaller. Although it is the strongest bone of the facial skeleton, the mandible tends to deform in old age; it is also subject to fracturing. Surgery allows for the removal of jawbone fragments (or its entirety) as well as regenerative methods. Additionally, the bone is of great forensic significance. Struct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Hyoid Bone
The hyoid-bone (lingual-bone or tongue-bone) () is a horseshoe-shaped bone situated in the anterior midline of the neck between the chin and the thyroid-cartilage. At rest, it lies between the base of the mandible and the third cervical vertebra. Unlike other bones, the hyoid is only distantly articulated to other bones by muscles or ligaments. It is the only bone in the human body that is not connected to any other bones. The hyoid is anchored by muscles from the anterior, posterior and inferior directions, and aids in tongue movement and swallowing. The hyoid bone provides attachment to the muscles of the floor of the mouth and the tongue above, the larynx below, and the epiglottis and pharynx behind. Its name is derived . Structure The hyoid bone is classed as an irregular bone and consists of a central part called the body, and two pairs of horns, the greater and lesser horns. Body The body of the hyoid bone is the central part of the hyoid bone. *At the fron ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Mylohyoid Muscle
The mylohyoid muscle or diaphragma oris is a paired muscle of the neck. It runs from the Human mandible, mandible to the hyoid bone, forming the floor of the oral cavity of the human mouth, mouth. It is named after its two attachments near the molar (tooth), molar teeth. It forms the floor of the submental triangle. It elevates the hyoid bone and the tongue, important during swallowing and Speech, speaking. Structure The mylohyoid muscle is flat and triangular, and is situated immediately Anatomical terms of location#Superior and inferior, superior to the digastric muscle, anterior belly of the digastric muscle. It is a pharyngeal musculature, pharyngeal muscle (derived from the first pharyngeal arch) and classified as one of the suprahyoid muscles. Together, the paired mylohyoid muscles form a muscular floor for the oral cavity of the human mouth, mouth. The two mylohyoid muscles arise from the mandible at the mylohyoid line, which extends from the mandibular symphysis in front ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Investing Layer Of Deep Cervical Fascia
The investing layer of deep cervical fascia is the most superficial part of the deep cervical fascia, and encloses the whole neck. It is considered by some sources to be incomplete or nonexistent. Attachments It surrounds the neck like a collar, it splits around the sternocleidomastoid muscle and the trapezius muscle. It is attached as; * Posteriorly - Ligamentum nuchae * Anteriorly - Attached to the hyoid bone * Superiorly - (from backwards to forwards); ** External occipital protuberance and superior nuchal line of occipital bone ** Mastoid process of temporal bone ** External acoustic meatus ** Lower margin of the zygomatic arch ** Lower border of body of mandible from the angle of mandible to the symphysis menti * Inferiorly - (from backwards to forwards); ** Spine and acromial process of scapula ** Upper surface of the clavicle **Suprasternal notch of manubrium sterni Tracings * Horizontal extent - From ligamentum nuchae when traced forward, the fascia splits and enc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Lymph Glands
A lymph node, or lymph gland, is a kidney-shaped organ of the lymphatic system The lymphatic system, or lymphoid system, is an organ system in vertebrates that is part of the immune system and complementary to the circulatory system. It consists of a large network of lymphatic vessels, lymph nodes, lymphoid organs, lympha ... and the adaptive immune system. A large number of lymph nodes are linked throughout the body by the lymphatic vessels. They are major sites of lymphocytes that include B cell, B and T cells. Lymph nodes are important for the proper functioning of the immune system, acting as filters for foreign particles including cancer cells, but have no detoxification function. In the lymphatic system, a lymph node is a Lymphatic system#Secondary lymphoid organs, secondary lymphoid organ. A lymph node is enclosed in a fibrous capsule and is made up of an outer cortex and an inner medulla. Lymph nodes become inflamed or enlarged in various diseases, which may range f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Submental Lymph Nodes
The submental lymph nodes (or suprahyoid lymph nodes) are 2-3 lymph nodes situated in the submental triangle, between the anterior bellies of the digastric muscle and the hyoid bone. Anatomy The submental lymph nodes are situated in the submental fascial space. They are situated close to the midline. They are immediately superficial to the mylohyoid muscle. Afferents They drain the lower lip, floor of the mouth, apex of the tongue, chin, and inferior/mandibular incisor teeth and their associated periodontium and gingiva. Efferents They drain either to submandibular lymph nodes (which then drain to deep cervical lymph nodes), or to the deep cervical lymph nodes directly. Clinical significance The most common cause of enlargement of the submental lymph nodes are infections (including viral infections such as mononucleosis, Epstein-Barr virus infection, and cytomegaloviral infections), toxoplasmosis, and dental infections (e.g. periodontitis)). The lymph nodes may be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Anterior Jugular Vein
The anterior jugular vein is a vein in the neck. Structure The anterior jugular vein lies lateral to the cricothyroid membrane. It begins near the hyoid bone by the confluence of several superficial veins from the submandibular region. Its tributaries are some laryngeal veins, and occasionally a small thyroid vein. It descends between the median line and the anterior border of the sternocleidomastoid muscle, and, at the lower part of the neck, passes beneath that muscle to open into the termination of the external jugular vein, or, in some instances, into the subclavian vein. Just above the sternum the two anterior jugular veins communicate by a transverse trunk, the venous jugular arch, which receive tributaries from the inferior thyroid veins; each also communicates with the internal jugular. There are no valves in this vein. The pretracheal lymph nodes follow the anterior jugular vein on each side of the midline. Variation The anterior jugular vein varies consider ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Anterior Triangle Of The Neck
The anterior triangle is a region of the neck. Structure The triangle is inverted with its apex inferior to its base which is under the chin. Investing fascia covers the roof of the triangle while visceral fascia covers the floor. Anatomy Muscles: * Suprahyoid muscles - Digastric (Ant and post belly), mylohyoid, geniohyoid and stylohyoid. * Infrahyoid muscles - Omohyoid, sternohyoid, sternothyroid, and thyrohyoid. Nerve supply 2 Bellies of digastric * Anterior: Mylohyoid nerve * Posterior: Facial nerve Stylohyoid: by the facial nerve, by a branch from that to the posterior belly of digastric. Mylohyoid: by its own nerve, a branch of the inferior alveolar (from the mandibular division of trigeminal nerve), which arises just before the parent nerve enters the mandibular foramen, pierces the sphenomandibular ligament, and runs forward on the inferior surface of the mylohyoid, supplying it and the anterior belly of the digastric. Geniohyoid: by a branch from the hypoglossa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |