Logan Steele
The stylohyoid muscle is a thin, slender muscle located in the anterior triangle of the neck. It is part of the suprahyoid muscle group, which includes three other muscles: the mylohyoid, geniohyoid, and digastric muscles. The stylohyoid muscle has an important role in tongue retraction, swallowing, and maintaining an open airway during inspiration. Its movement elevates and retracts the hyoid bone, resulting in the retraction of the tongue and elongation of the floor of the mouth. This muscle is innervated by the stylohyoid branch of the facial nerve (CN VII), which is crucial for its function and overall oropharyngeal health.
| Characteristics | Values |
|---|---|
| Muscle type | Suprahyoid |
| Muscle group | Part of the suprahyoid muscle group |
| Muscle location | Anterosuperior to the posterior belly of the digastric muscle |
| Nerve | Stylohyoid branch of the facial nerve (CN VII) |
| Nerve origin | Close to the stylomastoid foramen |
| Nerve structure | Divides into several smaller filaments |
| Function | Elevates and retracts the hyoid bone, facilitating tongue retraction, swallowing, and keeping the airway open during inspiration |
| Muscle structure | Thin, small, and slender |
| Muscle origin | Posterior surface of the styloid process of the temporal bone |
| Muscle insertion | Body of the hyoid bone |
| Muscle movement | Anteroinferior and medial direction |
| Muscle perforation | Pierced by the digastric muscle near its inferior end |
| Muscle variation | May be absent or additional slips may be present |
| Muscle transfer | Possible surgical option for marginal mandibular nerve palsy |
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What You'll Learn
- The stylohyoid muscle is innervated by a branch of the facial nerve
- The nerve has a significant contribution to the oropharyngeal phase of deglutition
- Paralysis or weakness of the muscle may occur if the facial nerve is damaged
- Pathologic conditions associated with the muscle may result in cervical and pharyngeal symptoms
- The stylohyoid branch of the facial nerve originates near the stylomastoid foramen
The stylohyoid muscle is innervated by a branch of the facial nerve
The stylohyoid muscle is a thin, slender muscle located in the anterior triangle of the neck. It is part of the suprahyoid muscle group, which connects the hyoid bone to the mandible and skull. This muscle is responsible for elevating and retracting the hyoid bone, resulting in tongue retraction and lengthening the floor of the mouth. This action is crucial during swallowing, as it pushes food towards the soft palate and keeps the airway open.
In addition to its innervation, the stylohyoid muscle receives its blood supply from the facial artery, posterior auricular artery, and occipital artery, which are all large branches of the external carotid artery. These arteries provide essential oxygenated blood to the muscle, ensuring its proper function.
The stylohyoid muscle is subject to variation, and it may be absent or additional slips may be present in some individuals. It is also associated with pathologic conditions, such as Eagle's syndrome, which can cause symptoms like neck pain, painful swallowing, and ear pain.
Overall, the stylohyoid muscle, innervated by a branch of the facial nerve, plays a crucial role in tongue retraction and swallowing. Its proper function is essential for maintaining vital activities like eating and breathing.
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The nerve has a significant contribution to the oropharyngeal phase of deglutition
The stylohyoid muscle is a thin, slender muscle that connects the hyoid bone to the skull. It is one of the four suprahyoid muscles, the other three being the mylohyoid, geniohyoid, and digastric muscles. The hyoid bone is elevated and retracted by the stylohyoid muscle, which also results in the elongation of the floor of the mouth. This movement is important during the oropharyngeal phase of deglutition, or swallowing, as it helps push the food bolus back towards the soft palate. The stylohyoid muscle also plays a role in keeping the pharynx open during inspiration, which is crucial for protecting the airway during swallowing.
The nerve that innervates the stylohyoid muscle is the facial nerve, specifically the stylohyoid branch. This nerve contributes significantly to the oropharyngeal phase of deglutition through various muscles, including the stylohyoid muscle. Damage to the facial nerve can lead to paralysis or weakness of the stylohyoid muscle, causing difficulty in swallowing.
Deglutition, or swallowing, is a complex process involving a variety of muscles and nerves. It can be divided into three distinct phases: the oral phase, the pharyngeal phase, and the oesophageal phase. The oral phase can be further divided into an oral preparatory phase and an oral propulsive phase, during which the bolus is propelled down the palate by the tongue towards the oropharynx. The pharyngeal phase involves rapid muscle contractions to propel the bolus through the upper oesophageal sphincter and into the oesophagus. This phase is crucial for airway protection, as breathing temporarily ceases to prevent the aspiration of ingested material.
The pharyngeal stage of swallowing involves coordination from multiple nerves and nerve plexuses. The primary nerves involved include CN V3, IX, X, XII, the ansa cervicalis, and the recurrent laryngeal nerves. The stylohyoid muscle is innervated by CN VII, which is a branch of the facial nerve. This nerve plays a crucial role in the pharyngeal stage of swallowing by coordinating the movement of the hyoid bone and assisting with tongue retraction, ensuring that food is directed towards the oesophagus rather than the airway.
In summary, the nerve that innervates the stylohyoid muscle, the facial nerve, has a significant contribution to the oropharyngeal phase of deglutition. It enables the stylohyoid muscle to elevate and retract the hyoid bone, elongate the floor of the mouth, and assist with tongue retraction. This complex process involves coordination between multiple muscles and nerves to ensure effective swallowing while protecting the airway.
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Paralysis or weakness of the muscle may occur if the facial nerve is damaged
The stylohyoid muscle is a thin, paired muscle located in the anterior triangle of the neck. It is part of the suprahyoid muscle group, which connects the hyoid bone to the mandible and skull. The stylohyoid muscle is responsible for elevating and retracting the hyoid bone, which in turn retracts the tongue and keeps the pharynx open during inspiration.
The stylohyoid muscle is innervated by the stylohyoid branch of the facial nerve (CN VII). This nerve carries motor, secretory, and afferent fibres from the anterior two-thirds of the tongue. It originates in the facial nucleus, located at the caudal pontine area. The facial nerve also provides innervation to several other muscles, including the posterior belly of the digastric, stapedius, and buccinator muscles.
Paralysis or weakness of the stylohyoid muscle may occur if the facial nerve is damaged. This can lead to difficulty in swallowing, known as dysphagia, and pain in the neck and upper regions of the front part of the neck. The specific symptoms associated with facial nerve damage depend on the location of the lesion and the branches that are affected. For example, damage to the chorda tympani branch can result in reduced salivation and loss of taste, while damage to the greater petrosal nerve can cause reduced lacrimal fluid production.
Facial nerve paralysis can be caused by various factors, including infections related to the external or middle ear, resulting in Bell's palsy. Tumors of the facial nerve or in its direct vicinity can also lead to facial nerve palsy, which may have a gradual or sudden onset. In some cases, denervation of the muscle for prolonged periods can result in significant muscle fiber decay.
The stylohyoid muscle is supplied by branches of the facial, posterior auricular, and occipital arteries, which are all large branches of the external carotid artery. The muscle may be absent or doubled, and it can be involved in pathologic conditions such as Eagle syndrome, characterised by partial ossification of the stylohyoid ligament.
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Pathologic conditions associated with the muscle may result in cervical and pharyngeal symptoms
The stylohyoid muscle is a slender, thin, and narrow muscle that plays a role in various functions, including chewing, swallowing, and phonetics. It is one of the four suprahyoid muscles, which are inserted superiorly on the hyoid bone. The stylohyoid muscle connects the hyoid bone to the base of the skull and draws the hyoid bone upward and backward, resulting in the elevation of the base of the tongue and elongation of the floor of the mouth.
Pathologic conditions associated with the stylohyoid muscle may result in cervical and pharyngeal symptoms. For example, myofascial pain syndrome can cause moderate to severe pain in the stylohyoid muscle, which can be treated with non-steroidal anti-inflammatory drugs to reduce pain and inflammation. Severe cases may require injections to numb the affected area. Patients may experience stylohyoid syndrome symptoms, including orofacial and cervical pain, usually triggered by neck movements if the stylohyoid muscle inserts in an unusual fashion, covering the hyoid bone like a belt.
Additionally, Eagle's syndrome, also known as stylohyoid syndrome, can result from partial ossification of the ligament of the stylohyoid muscle. This condition causes sharp, shooting pain in the jaw, which may radiate to the throat, tongue, or ear. Patients with Eagle's syndrome may also experience difficulty swallowing, a sore throat, and tinnitus. Treatment for Eagle's syndrome typically involves surgical resection of the ligament, as it compresses the underlying structures.
Paralysis or weakness of the stylohyoid muscle can occur if the facial nerve, which innervates the muscle, becomes damaged. This nerve damage can cause difficulty in swallowing, as the facial nerve contributes significantly to the oropharyngeal phase of deglutition. Furthermore, pathologic conditions affecting the stylohyoid muscle can lead to neck pain in specific areas, such as the angle of the mandible, submandibular space, and anterior upper neck. This pain may be exacerbated by everyday movements like speaking, swallowing, yawning, or turning the head.
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The stylohyoid branch of the facial nerve originates near the stylomastoid foramen
The stylohyoid muscle is a thin, slender muscle that is part of the suprahyoid muscle group. The suprahyoid region is located in the anterior and superior part of the neck. The stylohyoid muscle originates from the styloid process of the temporal bone and inserts onto the hyoid bone.
The stylohyoid muscle is innervated by the stylohyoid branch of the facial nerve (CN VII). The stylohyoid branch of the facial nerve originates close to the stylomastoid foramen and divides into several smaller filaments that innervate the stylohyoid muscle. The facial nerve plays a crucial role in the oropharyngeal phase of deglutition, which is the process of swallowing.
The stylohyoid muscle acts to elevate and retract the hyoid bone, drawing it upwards and backwards. This movement of the hyoid bone is important for tongue retraction and lengthening the floor of the mouth during swallowing. It also helps to keep the pharynx open during inspiration by tensing the floor of the mouth.
The stylohyoid muscle receives its blood supply from branches of the facial, posterior auricular, and occipital arteries, which are all large branches of the external carotid artery. The muscle is perforated near its insertion by the intermediate tendon of the digastric muscle.
The stylohyoid muscle is subject to pathologic conditions that can result in cervical and pharyngeal symptoms such as neck pain, painful swallowing, and difficulty opening the mouth. In some cases, stylohyoid muscle transfer surgery may be considered as a treatment option.
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Frequently asked questions
The stylohyoid muscle is innervated by the stylohyoid branch of the facial nerve (CN VII).
The stylohyoid is a thin, paired muscle located in the anterior triangle of the neck. It is part of the suprahyoid muscle group, which includes three other muscles: mylohyoid, geniohyoid, and digastric.
The stylohyoid muscle acts to elevate and retract the hyoid bone, initiating the swallowing process. It also helps to keep the pharynx open during inspiration by tensing the floor of the mouth.
The stylohyoid muscle originates from the styloid process of the temporal bone and inserts onto the hyoid bone.
The stylohyoid muscle receives arterial supply from branches of the facial artery, posterior auricular artery, and occipital artery.
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