Tensor veli palatini muscle | |
---|---|
Details | |
Origin | Medial pterygoid plate of the sphenoid bone (scaphoid fossa) |
Insertion | Palatine aponeurosis |
Nerve | Mandibular nerve (V3) |
Actions | Tension of the soft palate |
Identifiers | |
Latin | musculus tensor veli palatini |
TA98 | A05.2.01.103 |
TA2 | 2129 |
FMA | 46730 |
Anatomical terms of muscle |
The tensor veli palatini muscle (tensor palati or tensor muscle of the velum palatinum) is a thin, triangular muscle of the head that tenses the soft palate and opens the Eustachian tube to equalise pressure in the middle ear.
The tensor veli palatini muscle is thin and triangular in shape. [1]
It arises from the scaphoid fossa of the pterygoid process of the sphenoid [1] anteriorly[ citation needed ], the (medial aspect of the) spine of sphenoid bone posteriorly, and - between the aforementioned anterior and posterior attachments - from the anterolateral aspect of the membranous wall of the pharyngotympanic tube. [1]
At the muscle's origin, some of its muscle fibres may be continuous with those of the tensor tympani muscle. [1]
Inferiorly, the muscle converges to form a tendon of attachment. This tendon winds medially around the pterygoid hamulus (with a small bursa interposed between the two) to insert into the palatine aponeurosis and into the bony surface posterior to the palatine crest of the horizontal plate of palatine bone. [1]
Some of the muscle's fibres insert onto the lateral lamina of the cartilaginous part of pharyngotympanic tube and adjacent connective tissue, and the Ostmann's fat pad. [1]
The portion of the muscle with these attachments is sometimes called the dilator tubae. [1]
The tensor veli palatini muscle receives motor innervation from the mandibular nerve (CN V3) (a branch of the trigeminal nerve (CN V)) [2] via the nerve to medial pterygoid. [1]
It is the only muscle of the palate not innervated by the pharyngeal plexus, which is formed by the vagal and glossopharyngeal nerves.[ citation needed ]
It is situated anterolaterally to the levator veli palatini muscle.[ citation needed ]
From its origin to its insertion, the muscle passes vertically between the medial pterygoid plate and the medial pterygoid muscle.[ citation needed ]
Bilateral contraction of the two tensor veli palatini muscles makes the soft palate (especially its anterior portion) taut, as well as flattening the arch of the soft palate and thereby depressing it. [1]
Unilateral contraction draws the soft palate ipsilaterally. [1]
The tensor veli palatini tenses the soft palate and by doing so, assists the levator veli palatini in elevating the palate to occlude and prevent entry of food into the nasopharynx during swallowing. The tensed palate consequently provides a stable platform for elevation of the pharynx during swallowing by the pharyngeal muscles.
Since it is also attached to the lateral cartilaginous lamina of the pharyngotympanic tube (auditory tube or Eustachian tube), it assists in its opening during swallowing or yawning to allow air pressure to equalize between the tympanic cavity and the outside air. Equalization of air pressure in the tympanic cavity is essential for preventing damage to the tympanic membrane and a resulting loss of hearing acuity.
Articles related to anatomy include:
The Eustachian tube, also called the auditory tube or pharyngotympanic tube, is a tube that links the nasopharynx to the middle ear, of which it is also a part. In adult humans, the Eustachian tube is approximately 35 mm (1.4 in) long and 3 mm (0.12 in) in diameter. It is named after the sixteenth-century Italian anatomist Bartolomeo Eustachi.
The soft palate is, in mammals, the soft tissue constituting the back of the roof of the mouth. The soft palate is part of the palate of the mouth; the other part is the hard palate. The soft palate is distinguished from the hard palate at the front of the mouth in that it does not contain bone.
In neuroanatomy, the mandibular nerve (V3) is the largest of the three divisions of the trigeminal nerve, the fifth cranial nerve (CN V). Unlike the other divisions of the trigeminal nerve (ophthalmic nerve, maxillary nerve) which contain only afferent fibers, the mandibular nerve contains both afferent and efferent fibers. These nerve fibers innervate structures of the lower jaw and face, such as the tongue, lower lip, and chin. The mandibular nerve also innervates the muscles of mastication.
The medial pterygoid muscle is a thick, quadrilateral muscle of the face. It is supplied by the mandibular branch of the trigeminal nerve (V). It is important in mastication (chewing).
The levator veli palatini is a muscle of the soft palate and pharynx. It is innervated by the vagus nerve via its pharyngeal plexus. During swallowing, it contracts, elevating the soft palate to help prevent food from entering the nasopharynx.
The palatopharyngeusmuscle is a small muscle in the roof of the mouth.
The superior pharyngeal constrictor muscle is a quadrilateral muscle of the pharynx. It is the uppermost and thinnest of the three pharyngeal constrictors.
The pharyngeal arches, also known as visceral arches, are transient structures seen in the embryonic development of humans and other vertebrates, that are recognisable precursors for many structures. In fish, the arches support the gills and are known as the branchial arches, or gill arches.
The musculus uvulae is a bilaterally muscle of the soft palate that acts to shorten the uvula when both muscles contract. It forms most of the mass of the uvula. It is innervated by the pharyngeal plexus of vagus nerve.
The palatine aponeurosis a thin, firm, fibrous lamella which gives strength and support to soft palate. It serves as the insertion for the tensor veli palatini and levator veli palatini, and the origin for the musculus uvulae, palatopharyngeus, and palatoglossus.
The pterygoid processes of the sphenoid, one on either side, descend perpendicularly from the regions where the body and the greater wings of the sphenoid bone unite.
The greater wing of the sphenoid bone, or alisphenoid, is a bony process of the sphenoid bone, positioned in the skull behind each eye. There is one on each side, extending from the side of the body of the sphenoid and curving upward, laterally, and backward.
The ascending palatine artery is an artery is a branch of the facial artery which ascends along the neck before splitting into two terminal branches; one branch supplies the soft palate, and the other supplies the palatine tonsil and pharyngotympanic tube.
The petrous part of the temporal bone is pyramid-shaped and is wedged in at the base of the skull between the sphenoid and occipital bones. Directed medially, forward, and a little upward, it presents a base, an apex, three surfaces, and three angles, and houses in its interior the components of the inner ear. The petrous portion is among the most basal elements of the skull and forms part of the endocranium. Petrous comes from the Latin word petrosus, meaning "stone-like, hard". It is one of the densest bones in the body. In other mammals, it is a separate bone, the petrosal bone.
The infratemporal fossa is an irregularly shaped cavity that is a part of the skull. It is situated below and medial to the zygomatic arch. It is not fully enclosed by bone in all directions. It contains superficial muscles, including the lower part of the temporalis muscle, the lateral pterygoid muscle, and the medial pterygoid muscle. It also contains important blood vessels such as the middle meningeal artery, the pterygoid plexus, and the retromandibular vein, and nerves such as the mandibular nerve (CN V3) and its branches.
The medial pterygoid nerve (nerve to medial pterygoid, or internal pterygoid nerve) is a nerve of the head. It is a branch of the mandibular nerve (CN V3). It supplies the medial pterygoid muscle, the tensor veli palatini muscle, and the tensor tympani muscle.
The following outline is provided as an overview of and topical guide to human anatomy:
The pharynx is the part of the throat behind the mouth and nasal cavity, and above the esophagus and trachea. It is found in vertebrates and invertebrates, though its structure varies across species. The pharynx carries food to the esophagus and air to the larynx. The flap of cartilage called the epiglottis stops food from entering the larynx.
In the pharynx, the sinus of Morgagni is the enclosed space between the upper border of the superior pharyngeal constrictor muscle, the base of the skull and the pharyngeal aponeurosis.
This article incorporates text in the public domain from page 1139 of the 20th edition of Gray's Anatomy (1918)
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