Dominic Stone
The hyoid bone is a small, crescent-shaped bone located in the front of the neck, below the mandible and above the thyroid cartilage. It is the only floating bone in the human body, meaning it is not connected to any other bone but is instead held in place by muscles, ligaments, and cartilage. The hyoid muscles are superficial muscles in the neck that attach to the hyoid bone and are divided into two groups: the suprahyoid muscles, which lie above the hyoid bone, and the infrahyoid muscles, which lie beneath it. These muscles play a crucial role in swallowing, breathing, and speech.
| Characteristics | Values |
|---|---|
| Definition | Superficial muscles in the neck which attach to the hyoid bone |
| Types | Suprahyoid muscles and infrahyoid muscles |
| Suprahyoid Muscle Count | 4 |
| Suprahyoid Muscles | Digastric, stylohyoid, mylohyoid, and geniohyoid |
| Suprahyoid Muscle Function | Assist in depressing the mandible when the infrahyoid muscles are contracted and elevating the hyoid bone when the mandible is fixed |
| Infrahyoid Muscle Count | 4 |
| Infrahyoid Muscles | Omohyoid, sternohyoid, sternothyroid, and thyrohyoid |
| Infrahyoid Muscle Function | Depress the hyoid bone and play an important role in the position of the larynx and swallowing |
| Hyoid Bone Function | Supports tongue, plays a key role in speaking, swallowing, and breathing |
| Hyoid Bone Location | Front of the neck, below the lower jaw, and above the thyroid cartilage |
| Hyoid Bone Shape | Crescent-shaped or U-shaped |
| Hyoid Bone Structure | The only "floating" bone in the body, connected to other structures by ligaments, muscles, and cartilage |
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What You'll Learn
Hyoid muscles are superficial muscles in the neck
The hyoid bone is a small, U-shaped or crescent-shaped bone located at the front of the neck, below the mandible and above the thyroid cartilage. It is the only "floating" bone in the human body, meaning it is not connected to any other bone and is instead held in place by ligaments, muscles, and cartilage. The hyoid bone plays a crucial role in swallowing, breathing, and speech.
The hyoid muscles are superficial muscles in the neck that attach to the hyoid bone. They are divided into two groups based on their position relative to the hyoid bone: the suprahyoid muscles and the infrahyoid muscles. The suprahyoid muscles lie above the hyoid bone, while the infrahyoid muscles lie beneath it. These muscles work together to stabilise the trachea and facilitate vital functions such as swallowing and speech.
The suprahyoid muscles consist of four muscles: the digastric, stylohyoid, mylohyoid, and geniohyoid. These muscles contribute to the formation of the floor of the mouth and play a role in swallowing, mastication, and vocalization. When the infrahyoid muscles contract, they depress the hyoid bone, allowing the suprahyoid muscles to contract and depress the mandible. This coordination between the infrahyoid and suprahyoid muscles helps in the elevation of the hyoid bone.
The infrahyoid muscles also consist of four muscles: the omohyoid, sternohyoid, sternothyroid, and thyrohyoid. They act to depress the hyoid bone and influence the position of the larynx, which is crucial for swallowing. The infrahyoid muscles lie in two planes: the superficial plane, which includes the omohyoid and sternohyoid muscles, and the deep plane, which includes the sternothyroid and thyrohyoid muscles.
The hyoid muscles, along with the hyoid bone, are essential for various physiological functions, including breathing, swallowing, and speech. They work in coordination with other structures in the neck and mouth to enable these vital functions.
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Hyoid muscles are grouped as suprahyoid and infrahyoid
The hyoid muscles are superficial muscles in the neck that attach to the hyoid bone. They are categorised into two groups based on their position relative to the hyoid bone: the suprahyoid muscles, which lie above the hyoid bone, and the infrahyoid muscles, which lie below it.
The hyoid muscles are essential for stabilising the trachea and facilitating swallowing and speech. When the infrahyoid muscles contract, they depress the hyoid bone, allowing the suprahyoid muscles to contract and depress the mandible. Conversely, when the suprahyoid muscles contract while the infrahyoid muscles are relaxed, the hyoid bone is elevated. This coordination between the suprahyoid and infrahyoid muscles is crucial for the positioning of the hyoid bone.
The suprahyoid muscles consist of four muscles: the digastric, stylohyoid, mylohyoid, and geniohyoid. These muscles contribute to swallowing and mastication, and they form the floor of the mouth. The digastric muscle, for example, has two bellies: the anterior and posterior bellies, which are separated by an intermediate tendon. The stylohyoid muscles assist in elevating the hyoid bone and widening the oesophagus during swallowing. The mylohyoid muscles elevate the hyoid bone and floor of the mouth, while the geniohyoid pulls the hyoid bone anterosuperiorly, shortening the floor of the mouth and widening the pharynx during swallowing.
The infrahyoid muscles also consist of four muscles: the omohyoid, sternohyoid, sternothyroid, and thyrohyoid. These muscles stabilise the hyoid bone and assist in depressing the mandible. The thyrohyoid muscle, for example, moves the thyroid ala superiorly and anteriorly, while the sternothyroid depresses the larynx.
Damage to the hyoid muscles can result in difficulties with speaking and swallowing, as well as a hoarse voice. Therefore, it is crucial to understand the anatomy and function of these muscles to prevent and treat any associated conditions effectively.
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Suprahyoid muscles consist of four muscles
The hyoid bone is a small, crescent-shaped bone located in the front of the neck, under the lower jaw and above the thyroid cartilage. It is the only ""floating" bone in the human body, meaning it is not connected to any other bone and is instead held in place by ligaments, muscles, and cartilage.
The hyoid bone plays a crucial role in several physiological functions, including breathing, swallowing, and speech. It supports the tongue and larynx (voice box), and its position aids in producing a wide range of sounds.
The suprahyoid muscles are a group of four muscles located superior to the hyoid bone. They include the digastric, mylohyoid, geniohyoid, and stylohyoid muscles. These muscles work together to position the hyoid bone and coordinate the movements of the floor of the mouth and the hyoid bone during swallowing or vocalization. The digastric muscle, for example, aids in chin depression and retraction, assisting with mouth opening. The mylohyoid muscle elevates the floor of the mouth and tongue, playing a role in deglutition and speech. The geniohyoid muscle moves the hyoid bone upward and forward, widening the airway passage, while the stylohyoid muscle elevates and retracts the hyoid bone, resulting in the retraction and lengthening of the floor of the mouth.
The suprahyoid muscles are arranged in three planes. The deep plane contains the geniohyoid muscle, the middle plane consists of the mylohyoid muscle, and the superficial plane is formed by the digastric and stylohyoid muscles. These muscles contribute to mandibular depression, facilitating a wide opening of the mouth, and assist in neck flexion. They also play an important role in chewing and phonation, working alongside the infrahyoid muscles to stabilize the hyoid bone.
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Infrahyoid muscles also consist of four muscles
The hyoid bone is a small, U-shaped or crescent-shaped bone located in the front of the neck, below the lower jaw and above the thyroid cartilage. It is the only "floating" bone in the human body, meaning it is not connected to any other bone and is instead held in place by ligaments, muscles, and cartilage. The hyoid bone plays a crucial role in several physiological functions, including breathing, swallowing, and speech.
The infrahyoid muscles are a group of four paired muscles located in the anterior part of the neck, specifically below the hyoid bone. They can be divided into two groups: the superficial plane and the deep plane. The superficial plane comprises the omohyoid and sternohyoid muscles, while the deep plane includes the sternothyroid and thyrohyoid muscles. These infrahyoid muscles, along with the suprahyoid muscle group, are responsible for several functions related to speech, swallowing, and the movement of the larynx. They achieve this by controlling the positioning of the hyoid bone.
The omohyoid muscle, part of the superficial plane, is divided into a superior belly and an inferior belly. The inferior belly originates at the superior border of the scapula and merges into an intermediate tendon at the height of the lateral cervical region. The superior belly, on the other hand, arises from the hyoid bone and connects to the inferior belly via the intermediate tendon. The intermediate tendon itself is anchored to the clavicle by the deep cervical fascia. The omohyoid muscle is innervated by the ansa cervicalis (C1-C3), arising from the cervical plexus.
The sternohyoid muscle, also located in the superficial plane, originates from the posterior surface of the manubrium of the sternum and the posterior surface of the medial end of the clavicle. It inserts onto the inferior border of the body of the hyoid bone and functions to depress the hyoid bone from an elevated position. Like the omohyoid muscle, it is innervated by the ansa cervicalis (C1-C3) arising from the cervical plexus.
The sternothyroid muscle, found in the deep plane, is a wide muscle that lies underneath the sternohyoid. It arises from the manubrium of the sternum and attaches to the thyroid cartilage. Its function is to depress the thyroid cartilage. The sternothyroid muscle is innervated by the anterior rami of C1-C3, carried by a branch of the ansa cervicalis.
The thyrohyoid muscle, also part of the deep plane, is a short band of muscle that constitutes the continuation of the sternothyroid muscle. It originates at the oblique line of thyroid cartilage and inserts onto the inferior border of the body and greater cornu of the hyoid bone.
Damage to the infrahyoid muscles can result in various issues. Trauma to the cervical spine, for example, can injure the ansa cervicalis, leading to paresis or paralysis of the infrahyoid muscles. This can manifest as swallowing difficulties, a hoarse voice, and throat tightness.
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Hyoid muscles play a vital role in swallowing and speech
The hyoid bone is a floating bone in the body, meaning it is not connected to any other bones. Instead, it is held in place by ligaments, muscles, and cartilage. It is located in the front of the neck, below the lower jaw and above the thyroid cartilage. It is U-shaped or horseshoe-shaped and is essential for several physiological functions, including swallowing and speech.
The hyoid bone plays a crucial role in swallowing by providing support and attachment to various structures involved in the process. These structures include the muscles in the floor of the mouth, the tongue, the larynx, the epiglottis, and the pharynx. The hyoid bone also allows for a wider range of tongue, pharyngeal, and laryngeal movements, which are necessary for the complex biomechanical actions involved in swallowing.
The oral and suprahyoid muscles are responsible for the initiation of the swallowing process and the upward movement of the hyoid bone. The digastric, mylohyoid, and geniohyoid muscles aid in elevating and positioning the hyoid bone during swallowing. The geniohyoid muscle, in particular, originates from the inferior mental spine and elevates the hyoid bone, drawing it anteriorly. It also assists in depressing the mandible and pulling it inwards when the hyoid bone is fixed.
The hyoid bone also plays a significant role in speech. Its unique floating structure and attachments to surrounding muscles and structures enable it to support a wide range of tongue, pharyngeal, and laryngeal movements. This mobility allows for the production of varied sounds and speech capabilities. The discovery of a modern-looking hyoid bone in Neanderthal remains led to the hypothesis that Neanderthals possessed human-like speech capabilities due to their potentially descended larynx.
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Frequently asked questions
Hyoid muscles are superficial muscles in the neck that attach to the hyoid bone.
The hyoid muscles act to stabilise the trachea and play a vital part in swallowing and speech.
The hyoid muscles are made up of the suprahyoid muscles and the infrahyoid muscles.
