What does the styloglossus muscle do?
What does the styloglossus muscle do?
Action. The styloglossus draws up the sides of the tongue to create a trough for swallowing. As a pair they also aid in retracting the tongue.
What is the hyoglossus muscle?
The hyoglossus muscle is one of the four intrinsic muscles of the tongue. It is a quadrilateral muscle that originates along the whole length of the hyoid bone and inserts into the side of the tongue. The hyoglossus acts to both depress and retract the tongue.
Why is the hyoglossus muscle important?
Extrinsic muscles (genioglossus, hyoglossus, styloglossus, and palatoglossus) protrude, retract, depress, and elevate the tongue. Coordinated contraction of tongue muscles allows the fine control of tongue movement essential for articulation of speech, mastication, and swallowing.
What does the styloglossus muscle attach to?
The styloid process gives origin to three muscles, the styloglossus, stylohyoid, and stylopharyngeus. The styloglossus receives innervation from CN XII, attaches to the apex of the tongue, and draws up the sides of the tongue to form a conduit that facilitates swallowing.
What is the origin of hyoglossus muscle?
structure and function The hyoglossus muscles originate on each side from the whole length of the greater cornua and also from the body of the hyoid. They are inserted into the posterior half or more of the sides of the tongue.
What are styloglossus and stylohyoid?
The origin of the stylohyoid muscle is from the middle of the posterior surface of the styloid process of the temporal bone near its base. The styloglossus muscle lies medially and anterior to the stylohyoid muscle. The stylopharyngeal muscle is located between the stylohyoid and the styloglossus muscle.
What is the action of hyoglossus?
Function. The hyoglossus depresses and retracts the tongue and makes the dorsum more convex.
What happens when the hyoglossus contracts?
(2) They contract against blows to form a rigid protective wall for the viscera. (3) When the glottis is closed and the thorax and pelvis are fixed, these muscles take part in the expulsive efforts of urination, defecation, childbirth, vomiting, and of singing and coughing.
What is the origin of the hyoglossus muscle?
What do genioglossus hyoglossus and styloglossus have in common?
What do the genioglossus, hyoglossus, and styloglossus muscles have in common? All act on the tongue.
What is the origin of styloglossus muscle?
The styloglossus muscle is an extrinsic muscle of the tongue, and its origin in the styloid process of the temporal bone is well documented. However, some authors have noted variations in its origin.
Where is the styloglossus located?
tongue
The styloglossus muscle originates at the distal lateral aspect of the stylohyoid bone and travels the length of the tongue, along its lateral aspect (Sisson 1975a). Near the tip of the tongue the paired muscle meets and ramifies with fibers of other tongue muscles.
What is the anatomy of the styloglossus?
Anatomical terms of muscle. The Styloglossus, the shortest and smallest of the three styloid muscles, arises from the anterior and lateral surfaces of the styloid process near its apex, and from the stylomandibular ligament.
What is the difference between the hyoglossus and Glossus?
To easily remember their origins, just pay attention the their names. For example, the hyoglossus muscle: hyo- suggests the origin from the hyoid bone, while the -glossus is from the Greek ‘glossa’, meaning ‘tongue’, where this muscle inserts. ‘Stylo-’ refers to the styloid process and ‘palato-’ refers to the palate.
What is the difference between bilateral and unilateral hyoglossus contraction?
Bilateral contraction of this muscle depresses the central part of the tongue, creates a longitudinal furrow and protrudes the tongue outside of the mouth. Unilateral contraction on the other hand will deviate the tongue contralaterally. Hyoglossus is a quadrangular muscle that originates from the body and greater horn of the hyoid bone.
What nerve innervates the styloglossus?
Innervation. The styloglossus is innervated by the Hypoglossal nerve (CN XII) like all muscles of the tongue except palatoglossus which is innervated by the Pharyngeal plexus of vagus nerve (CN X).
