| 词条 | Superior pharyngeal constrictor muscle | |||
| 释义 |
| Name = Superior pharyngeal constrictor muscle | Latin = Musculus constrictor pharyngis superior | Image = Musculusconstrictorpharyngissuperior.png | Caption = Muscles of the pharynx and cheek. | Image2 = Gray1031.png | Caption2 = Muscles of the pharynx, viewed from behind, together with the associated vessels and nerves. | Origin = Medial pterygoid plate, pterygomandibular raphé, alveolar process | Insertion = Pharyngeal raphe, pharyngeal tubercle | Blood = Ascending pharyngeal artery and tonsillar branch of facial artery | Nerve = Pharyngeal plexus of vagus nerve | Action = Swallowing }} The superior pharyngeal constrictor muscle is a muscle in the pharynx. It is the highest located muscle of the three pharyngeal constrictors. The muscle is a quadrilateral muscle, thinner and paler than the inferior pharyngeal constrictor muscle and middle pharyngeal constrictor muscle. The muscle is divided into four parts: A pterygopharyngeal, buccopharyngeal, mylopharyngeal and a glossopharyngeal part. Origin and insertionThe four parts of this muscle arise from: - from the pterygomandibular raphe (Buccopharyngeal part) - from the alveolar process of the mandible above the posterior end of the mylohyoid line (Mylopharyngeal part) - and by a few fibers from the side of the tongue (Glossopharyngeal part) The fibers curve backward to be inserted into the median raphe, being also prolonged by means of an aponeurosis to the pharyngeal spine on the basilar part of the occipital bone. The superior fibers arch beneath the levator veli palatini muscle and the Eustachian tube. RelationsThe interval between the upper border of the muscle and the base of the skull is closed by the pharyngeal aponeurosis, and is known as the sinus of Morgagni. ActionAs soon as the bolus of food is received in the pharynx, the elevator muscles relax, the pharynx descends, and the constrictors contract upon the bolus, and convey it downward into the esophagus. InnervationThe superior pharyngeal constrictor muscle is innervated by the pharyngeal branch of the vagus nerve via the pharyngeal plexus. Additional imagesReferences{{Gray's}}External links
2 : Muscles of the head and neck|Pharynx |
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