Dominic Stone
The geniohyoid muscle is a narrow, paired muscle that belongs to the suprahyoid muscle group of the neck. It is innervated by the anterior ramus of spinal nerve C1, carried by the hypoglossal nerve. The hypoglossal nerve is also known as cranial nerve XII or CN XII. The geniohyoid muscle is involved in swallowing and voice production, and it assists in the opening of the mandible.
| Characteristics | Values |
|---|---|
| Muscle type | Suprahyoid muscle |
| Muscle group | Floor of the oral cavity |
| Muscle structure | Narrow, paired, short |
| Muscle origin | Inferior mental spine |
| Muscle insertion | Anterior surface of the body of the hyoid bone |
| Innervation | Anterior ramus of spinal nerve C1, carried by the hypoglossal nerve |
| Blood supply | Sublingual branch of the lingual artery |
| Function | Elevates and draws the hyoid bone anteriorly, assisting in swallowing, voice production, and mouth opening |
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What You'll Learn
The geniohyoid muscle is innervated by the anterior ramus of spinal nerve C1
The geniohyoid muscle is a narrow, paired muscle that is part of the suprahyoid muscle group in the neck. It is named for its passage from the chin—'genio-' is a standard prefix for 'chin'—to the hyoid bone. The hyoid bone is a small, U-shaped bone in the anterior neck, situated between the mandible and the thyroid cartilage.
The geniohyoid muscle has an important role in swallowing and voice production. It 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 body of the hyoid bone. When the geniohyoid muscle contracts, it pulls the hyoid bone and the attached larynx upwards and forwards. This movement widens the pharynx, preparing it to receive food during swallowing.
Additionally, the geniohyoid muscle assists in opening the mouth by depressing the mandible and pulling it inwards when the hyoid bone is fixed by other muscles. This synergistic action with the mylohyoid muscles helps in the process of mastication and aids in producing certain vocal sounds.
The arterial supply of the geniohyoid muscle comes from the sublingual branch of the lingual artery, providing oxygenated blood to the muscle tissue. Overall, the geniohyoid muscle, innervated by the anterior ramus of spinal nerve C1, plays a crucial role in various functions, including swallowing, speech, and mandibular movements.
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The nerve travels alongside the hypoglossal nerve
The geniohyoid muscle is a narrow, paired muscle that is part of the suprahyoid muscle group in the neck. It is involved in swallowing and voice production, coordinating the movements of the floor of the mouth and the hyoid bone. This muscle originates from the inferior mental spine, situated on the posterior surface of the mandible, and inserts into the anterior surface of the body of the hyoid bone. The geniohyoid muscle lies just above the mylohyoid muscle and below the genioglossus muscle.
The nerve that innervates the geniohyoid muscle is the first cervical spinal nerve (C1), specifically its anterior or ventral ramus. This nerve travels alongside the hypoglossal nerve into the floor of the mouth. The hypoglossal nerve is also known as the twelfth cranial nerve (CN XII). It is important to note that the nerve supplying the geniohyoid does not originate from the hypoglossal nucleus; instead, it is carried by the hypoglossal nerve.
The geniohyoid muscle receives its arterial supply from the sublingual branch of the lingual artery. This muscle plays a crucial role in elevating and drawing the hyoid bone anteriorly, which in turn moves the attached larynx and pharynx anterosuperiorly. This action widens the pharynx during swallowing and aids in voice production by the vocal cords. Additionally, when the hyoid bone is fixed by other muscles, the geniohyoid assists in depressing the mandible and pulling it inwards, facilitating mouth opening.
The function of the geniohyoid muscle is closely related to its structure and position in the body. Its unique inclined position, in contrast to the horizontal position observed in Neanderthals, allows it to perform these specific functions related to swallowing and vocalisation. The geniohyoid muscle works in conjunction with other muscles in the suprahyoid group, such as the digastric, stylohyoid, and mylohyoid muscles, to form the floor of the oral cavity.
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The geniohyoid muscle is a suprahyoid muscle
The geniohyoid muscle is named for its passage from the chin to the hyoid bone. The prefix "genio-" refers to the chin. The muscle is involved in coordinating the movements of the floor of the mouth and the hyoid bone during swallowing and voice production. It assists in depressing the mandible and pulling it inwards, which helps with opening the mouth. By pulling the hyoid bone anterosuperiorly, the geniohyoid muscle also plays a role in widening the pharynx during swallowing, facilitating the passage of food.
The inclined position of the geniohyoid muscle in humans contrasts with the horizontal position observed in Neanderthals. This muscle's function in elevating and moving the hyoid bone anteriorly has implications for the attached larynx and pharynx, contributing to respiration and voice production. The geniohyoid muscle works in conjunction with other suprahyoid muscles to form the floor of the oral cavity.
The suprahyoid muscles, including the geniohyoid, are also referred to as accessory muscles of mastication due to their contribution during chewing or mastication. They reinforce the floor of the mouth from above, while the anterior bellies of the digastric muscles provide support from below. Together, the suprahyoid muscles play a crucial role in positioning the hyoid bone and coordinating its movements during swallowing and vocalization.
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It is involved in the deglutition process and voice production
The geniohyoid muscle is a narrow, paired muscle that belongs to the suprahyoid muscle group of the neck. It is involved in the deglutition (swallowing) process and voice production.
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 movement of the larynx and pharynx is essential for the deglutition process, as it widens the pharynx to prepare for receiving food. The geniohyoid muscle also plays a role in controlling the position and function of the larynx, which is necessary for voice production.
During swallowing, the geniohyoid muscle contracts and works together with other suprahyoid muscles to shorten the pharynx, generating a propulsive force for oropharyngeal contents. This action is particularly important for the deglutition process, as it helps to propel food and liquids towards the oesophagus. The contraction of the geniohyoid muscle is also influenced by body position, with higher contraction rates observed at sitting and 60-degree semi-recumbent positions, resulting in easier swallowing.
The geniohyoid muscle is involved in voice production by contributing to the movement of the vocal cords. The shape of the ventricle created by the geniohyoid muscle may also create airflow turbulence, which is significant for vocal fold vibration during voice production.
The muscle receives its innervation from the first cervical spinal nerve fibres, travelling alongside the hypoglossal nerve.
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The muscle originates from the inferior mental spine
The geniohyoid muscle is a short, paired muscle that belongs to the suprahyoid muscle group of the neck. It is one of four mental spines, with the other three being two superior and one other inferior mental spine. The inferior mental spine is located on the posterior surface of the mandible near the lower part of the mandibular symphysis.
The geniohyoid muscle is named for its passage from the chin—the prefix "genio-" refers to the chin—to the hyoid bone. It is a narrow, paired muscle that arises from the inferior mental spine and runs backward and slightly downward. It is inserted into the anterior surface of the body of the hyoid bone. The muscle fibres radiate posteroinferiorly, close to the central line, and meet in the midline of the mouth floor.
The geniohyoid muscle is situated superior to the medial border of the mylohyoid muscle and lies in contact with its fellow on the opposite side. It is one of the muscles that constitute the floor of the oral cavity, along with the digastric, stylohyoid, and mylohyoid muscles. Its main function is to coordinate the movements of the floor of the mouth and the hyoid bone during swallowing and voice production.
The muscle is innervated by the anterior ramus of spinal nerve C1, carried by the hypoglossal nerve. The arterial supply of the geniohyoid muscle comes from the sublingual branch of the lingual artery.
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Frequently asked questions
The geniohyoid muscle is a narrow, paired muscle that belongs to the suprahyoid muscle group of the neck. It constitutes the floor of the oral cavity.
The main function of the geniohyoid muscle is to coordinate the movements of the floor of the mouth and the hyoid bone during swallowing and voice production. It elevates the hyoid bone and moves it anteriorly, causing the attached larynx and pharynx to move anterosuperiorly.
The geniohyoid muscle is innervated by the anterior ramus of spinal nerve C1, also known as the hypoglossal nerve.
