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The geniohyoid muscle is a short, narrow, paired muscle that is part of the suprahyoid muscle group in the neck. It is named for its passage from the chin to the hyoid bone, which it moves upwards and forwards, widening the airway passage and assisting with respiration. The muscle is involved in the first act of deglutition, when food is driven from the mouth into the pharynx, and it also assists in depressing the mandible.
| Characteristics | Values |
|---|---|
| Muscle type | Geniohyoid is a suprahyoid muscle |
| Muscle group | Geniohyoid is part of the suprahyoid muscle group of the neck |
| Muscle structure | Geniohyoid is a short, narrow, and paired muscle |
| Muscle function | Geniohyoid moves the hyoid bone upward and forward, widening the airway passage and assisting in respiration |
| Muscle innervation | Geniohyoid is innervated by the ventral ramus of C1, carried by the hypoglossal nerve |
| Muscle vascular supply | Geniohyoid receives vascular supply from branches of the lingual artery |
| Muscle attachments | Geniohyoid arises from the inferior mental spine and is inserted into the hyoid bone |
| Muscle interactions | Geniohyoid works with other muscles like the digastric, stylohyoid, and mylohyoid to facilitate swallowing, voice production, and mouth opening |
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What You'll Learn
The geniohyoid muscle is a short, paired muscle
The geniohyoid muscle is a narrow, paired muscle situated superior to the medial border of the mylohyoid muscle. It is named for its passage from the chin ("genio-" is a standard prefix for "chin") to the hyoid bone. The paired geniohyoid muscles, placed next to each other, meet in the midline of the mouth floor.
The geniohyoid muscle originates from the inferior mental spine, located on the posterior surface of the mandible near the lower part of the mandibular symphysis. From there, the muscle fibres radiate posteroinferiorly, close to the central line, and insert into the superior border of the body of the hyoid bone.
The main function of the geniohyoid muscle is to coordinate the movements of the floor of the mouth and the hyoid bone while swallowing and voice production. It brings the hyoid bone forward and upwards, dilating the upper airway and assisting respiration. It also assists in depressing the mandible and pulling it inwards, thus opening the mouth.
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It is innervated by the ventral ramus of C1
The geniohyoid muscle is a short, paired muscle that belongs to the suprahyoid muscle group of the neck. It is one of the suprahyoid muscles of the neck that is innervated by the ventral ramus of C1. The ventral ramus (plural: rami) is the anterior division of a spinal nerve. These nerves are larger than the dorsal rami and supply the antero-lateral parts of the trunk and the limbs. The ventral ramus carries both sensory and motor information, via efferent and afferent nerve fibres.
The geniohyoid muscle is innervated by the anterior ramus of spinal nerve C1, carried by the hypoglossal nerve. The hypoglossal nerve is the twelfth cranial nerve, also known as CN XII. The C1 spinal nerve gives rise to the nerve to the geniohyoid and the nerve to the thyrohyoid, which both function in the oropharynx. The geniohyoid muscle originates from the inferior mental spine, located on the posterior surface of the mandible near the lower part of the mandibular symphysis. From there, the muscle fibres radiate posteroinferiorly, close to the central line, and insert into the superior border of the body of the hyoid bone.
The geniohyoid muscle is involved in swallowing and voice production. It elevates the hyoid bone and draws it anteriorly, resulting in the attached larynx and pharynx moving anterosuperiorly. This movement dilates the upper airway, assisting respiration. Additionally, when the hyoid bone is fixed, the geniohyoid muscle assists in depressing the mandible and pulling it inwards, facilitating mouth opening.
The C1 nerve has a distinct upward course, differing from the horizontal or descending pathways of other cervical nerves. It pierces the dura mater as it exits the subarachnoid space and gives rise to the sinuvertebral nerve. The C1 nerve then divides into the dorsal ramus and the ventral ramus. The dorsal ramus of C1 is more prominent than the ventral ramus, and it gives rise to a cutaneous branch in some cases. The ventral ramus continues anterolaterally, travelling lateral to the vertebral artery, and eventually anastomoses with the hypoglossal nerve and other cervical nerves to form the cervical plexus.
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It is involved in swallowing and voice production
The geniohyoid muscle is a short, paired muscle that belongs to the suprahyoid muscle group of the neck. It is involved in swallowing and voice production.
The geniohyoid muscle is one of the muscles that constitute the floor of the oral cavity. It originates from the inferior mental spine, located on the posterior surface of the mandible near the lower part of the mandibular symphysis. From there, the muscle fibres radiate posteroinferiorly, close to the central line, and insert into the superior border of the body of the hyoid bone. The hyoid bone is a singular horseshoe-shaped bone in the anterior midline of the neck, just above the thyroid cartilage.
The main function of the geniohyoid muscle is to elevate the hyoid bone and draw it anteriorly, which has the consequence of moving the attached larynx and pharynx anterosuperiorly. This action of the geniohyoid muscle dilates the upper airway, assisting respiration and preparing the pharynx to receive food during the first act of deglutition. The geniohyoid muscle also assists in depressing the mandible and pulling it inwards to open the mouth, particularly when the hyoid bone is fixed by other muscles.
The geniohyoid muscle plays a central role in swallowing, and its function is influenced by body position. Studies have shown that semi-recumbent positions can reduce aspiration and improve swallowing when compared to supine positions. The geniohyoid muscle also participates in voice production by the vocal cords, as the movement of the hyoid and pharynx bones dilates the upper airway.
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It is located in the suprahyoid muscle group of the neck
The geniohyoid muscle is a short, paired muscle located in the suprahyoid muscle group of the neck. The suprahyoid muscles are a group of four muscles located superior to the hyoid bone. They include the digastric, mylohyoid, geniohyoid, and stylohyoid muscles. Together, they form the floor of the oral cavity and play a crucial role in chewing, swallowing, and speech.
The geniohyoid muscle originates from the inferior mental spine, located on the posterior surface of the mandible near the mandibular symphysis. From there, the muscle fibres radiate posteroinferiorly and insert into the superior border of the hyoid bone. The paired geniohyoid muscles meet in the midline of the mouth floor, coordinating movements during swallowing and voice production.
The main function of the geniohyoid muscle is to elevate and draw the hyoid bone anteriorly, which has the consequence of moving the attached larynx and pharynx anterosuperiorly. This action dilates the upper airway, assisting respiration and swallowing. When the hyoid bone is fixed, the geniohyoid muscle assists in depressing the mandible and pulling it inwards, facilitating mouth opening.
The geniohyoid muscle is innervated by the anterior ramus of spinal nerve C1, carried by the hypoglossal nerve. The arterial supply to the muscle comes from the lingual artery. The geniohyoid muscle's function and structure contribute significantly to the complex mechanics of the neck and oral cavity.
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It is closely related to the internal jugular vein and internal carotid artery
The geniohyoid muscle is a short, paired muscle that arises from the inferior mental spine, on the back of the mandibular symphysis, and runs backward and slightly downward, inserting into the anterior surface of the body of the hyoid bone. It is one of the suprahyoid muscles, which control the position and function of the larynx. The muscle receives its blood supply from branches of the lingual artery, specifically the suprahyoid branch.
The geniohyoid muscle is closely related to the internal jugular vein and internal carotid artery. The internal jugular vein is a major blood vessel that allows blood from the brain to return to the chest. It is located deep inside the body, underneath the major muscles of the neck. This vein is often used as an initial access site for a central venous catheter and is important for assessing the fluid status of a patient and administering fluids and medications. The internal carotid artery, on the other hand, is one of the blood vessels that supply oxygenated blood to the brain.
The internal jugular vein and internal carotid artery are both crucial structures in the head and neck region. They play a vital role in maintaining proper blood flow to and from the brain. The internal jugular vein is particularly important for medical procedures as it offers easy access for intravenous (IV) lines and is used for cannulation in various medical treatments. The internal carotid artery, being a blood supplier to the brain, is also of utmost importance, as any compression or blockage of this artery can have serious consequences.
The relationship between the geniohyoid muscle and the internal jugular vein and internal carotid artery is significant in understanding the complex anatomy of the head and neck region. The geniohyoid muscle's proximity to these vascular structures highlights the intricate network of muscles, blood vessels, and nerves in this area. This knowledge is crucial for medical professionals, especially during surgical procedures and interventions in the head and neck region.
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Frequently asked questions
The geniohyoid muscle is a short, paired muscle that belongs to the suprahyoid muscle group of the neck. It is involved in the movement of the hyoid bone and assists in swallowing, respiration, and voice production.
The geniohyoid muscle is situated superior to the medial border of the mylohyoid muscle and is positioned above the digastric and mylohyoid muscles.
The main function of the geniohyoid muscle is to elevate and draw the hyoid bone anteriorly, which in turn moves the attached larynx and pharynx anterosuperiorly. This action widens the upper airway, facilitating respiration and swallowing.
The geniohyoid muscle originates from the inferior mental spine, located on the posterior surface of the mandible near the mandibular symphysis. It then inserts into the anterior surface of the hyoid bone, moving backward and slightly downward.
The geniohyoid muscle is innervated by the first cervical spinal nerve, also known as Cranial Nerve XII, which travels alongside the hypoglossal nerve. Its blood supply comes from branches of the lingual artery.
