A discussion on the pterygopalatine fossa скачать в хорошем качестве

A discussion on the pterygopalatine fossa

This dialogue video is presented in the form of interactive questions and answers between the instructor and students. It simplifies the pterygopalatine fossa by using a flat diagram to show the communications of the fossa and the nerves and vessels that pass through the formaina and fissure. The video concluded with two matching questions by Dr. Robert Ackland that were shared by the American Association of Anatomists. 00:00 Intro 00:16 A flat diagram of the pterygopalatine fossa 01:22 What is this foramen in the posterior wall? 02:00 What are the inferior communications of the fossa? 02:58 The sphenopalatine foramen communicates with which cavity? 04:14 Which nerve carries parasympathetic fibers from the pterygopalatine ganglion and goes to the orbit? 04:53 What is the origin of the lacrimal nerve? And what type of fibers it carries? 05:36 Matching questions by Dr. Robert Ackland: Q1- Match the bony opening with the appropriate location in the pterygopalatine fossa. 08:05 Matching questions by Dr. Robert Ackland: Q2- Match the anatomical structures with the bony opening to which it enters or exits the pterygopalatine fossa. Presented and edited by Dr. Akram Jaffar, Ph.D. The pterygopalatine fossa is a funnel-shaped space, tapering downwards, bounded by the round surface of the back of the maxilla in front, the perpendicular plate of the palatine bone medially, and the vertical plate of bone that joins the two pterygoid plates behind. Laterally the pterygomaxillary fissure leads into the fossa from the infratemporal region. Since most of the fossa cannot be seen in the intact skull, the fossa is better described in a flat diagram of its three walls. In the center is the medial wall with the sphenopalatine foramen leading into the nasal cavity at the top. The anterior wall is with the inferior orbital fissure leading into the orbit at the top and the posterior wall is with foramen rotundum leading back into the cranial cavity at the top. There is also a small opening, the pterygoid canal nearby. The articulation between the maxilla and the perpendicular plate of the palatine bone leaves a tunnel between the two bones, the greater palatine canal, which opens onto the hard palate. Smaller canals, the lesser palatine canals lead from it. The maxillary nerve passes through foramen rotundum and enters the pterygopalatine fossa. It leaves the fossa anteriorly through the inferior orbital fissure. The pterygopalatine ganglion hangs down from the maxillary nerve in the fossa and is joined posteriorly by the nerve of the pterygoid canal (Vidian verve). This nerve is formed within foramen lacerum by the joining of the greater petrosal nerve and sympathetic fibers from the internal carotid plexus (deep petrosal nerve). Although many nerves seem to be coming from the pterygopalatine ganglion, the only neurons that synapse in the ganglion are the parasympathetic secretomotor nerves for the lacrimal gland, mucous glands of the nose and palate. The branches of the maxillary nerve are‎ greater palatine through the greater palatine canal to reach the hard palate. It gives off nasal branches that pierce the perpendicular plate of the palatine bone and also lesser palatine nerves to the soft palate. The nasopalatine nerve passes through the sphenopalatine foramen to enter the nasal cavity. The posterior superior alveolar runs on the back of the maxilla and enters a small foramen to supply molar teeth. The pterygopalatine ganglion is the largest peripheral ganglion of the parasympathetic system. If stimulated, it stimulates 'hay fever' causing streaming of the eyes, running of the nose, and mucous secretions from the palate. The preganglionic fibres reach the ganglion by way of the facial nerve and the greater petrosal nerve. The postganglionic fibres are then distributed along the zygomaticotemporal, lacrimal, palatine and nasal nerves to the lacrimal gland and mucous glands of the palate and nose. The maxillary artery after giving many branches in the infratemporal region enters the pterygopalatine fossa through the pterygomaxillary fissure and breaks up into branches that correspond to and are distributed along with the branches of the maxillary nerve. Related accounts Twitter   / akramjaffar   Facebook   / anatomyeduca.  . SlideShare http://www.slideshare.net/AkramJaffar LinkedIn   / akram-abo.  . Research gate https://www.researchgate.net/profile/... Medtube https://medtube.net/users/akram-jaffar Instagram   / akramjaffar   Vimeo https://vimeo.com/user9371641 Academia https://dal.academia.edu/AkramJaffar