origin: it arises from the oblique line on the side of the lamina, from the surface behind this nearly as far as the posterior border and from the inferior cornu.Inferior fibers are horizontal and continuous with the circular fibers of the esophagus the rest ascend, increasing in obliquity, and overlap with the middle constrictor. It passes from the thyroid and cricoid, and the fibres spread backwards into the fibrous pharyngeal raphe. The Inferior pharyngeal constrictor, the most inferior of the three constrictors. The gap between middle and inferior constrictors is closed by the thyrohyoid membrane, and piercing this membrane are the internal laryngeal nerve and superior laryngeal vessels. Insertion: median raphe (blending with the contralateral constrictor fibres). Origin: lesser, greater horn of the hyoid bone, the stylohyoid ligament. The lower fibres, arch down as far as the vocal folds and lie within the inferior constrictor. The fibres diverge upwards and downwards as they sweep back around the pharynx to enclose the super constrictor and meet in the median raphe. ![]() The middle pharyngeal constrictor is a fan-shaped muscle located in the neck. Gap laterally between the superior and middle constrictor (gateway to the mouth), passes the stylopharyngeus and styloglossus and glossopharyngeal and lingual nerves, hypoglossal nerve, lingual artery. Gap above the superior constrictor allows eustachean tube, ascending palatine artery and levator palatini to pass. Nerve: external laryngeal branch of the vagus nerve Insertion - pharyngeal raphe (into the pharyngeal tubercle)Īrterial supply: ascending pharyngeal artery, branch of the external carotid artery Origin - pterygoid hamulus, to pterygomandibular raphe and mandible (just above mylohyoid line) The superior pharyngeal constrictor muscle sweeps from its origin on the pterygomandibular raphe around the pharynx, diverging and meeting in the midline. tonsil drain to tonsilar node and then deep cervical groups.retropharyngeal lymph nodes and then to upper and lower cervical groups.pharyngeal plexuses at the back of the middle constrictor and drain into internal vein and connect with pterygoid plexuses.Superior and inferior laryngeal arteries.From maxillary artery (greater palatine and pharyngeal). ![]() ![]() From facial artery (ascending pharyngeal, ascending palatine and tonsillar).vagus nerve (cranial nerve X), specifically, by branches from the pharyngeal plexus and by neuronal branches from the recurrent laryngeal nerve.This fibrous thickening of submucosa feels in the gap between the skull and the upper border of the superior constrictor. The circular muscles overlap, telescoped into each other like the stacked cups.Īt the top of the muscles, it is attached to the base of the skull (pharyngeal tubercle anterior to foramen magnum) via the pharyngobasilar fascia. Superior/middle/inferior constrictors are thin curved circular sheets of muscles forming the pharynx with three smaller longitudinal muscles, stylopharyngeus, palatopharyneus and salpingopharyngeus. It is divided into three parts: nasopharynx, oropharynx and laryngopharynx. It is in communication with the nose, mouth and larynx. ![]() Pharynx is a fibromuscular tube, attached above to the base of the skull and continue below with the oesophagus (end of cricoid at C6).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |