Growth of the Orbit
D. Dixon Andrew, A.N. Hoyte David, Ronning Olli in Fundamentals of Craniofacial Growth, 2017
The bony orbit is formed from the mesenchyme surrounding the developing eye, derived from neural crest, invading the frontonasal and maxillary processes—frontal bone, maxilla, ethmoid, zygoma, nasal, and lacrimal. In relation to the developing eye, neural crest cells from the diencephalic region of the forebrain migrate rostrally, dorsal to the expanding eye vesicle, then stream caudally around the optic stalk. The floor is formed mainly by the maxilla—the roof of the maxillary sinus—with the zygoma making up the anterolateral part of the floor and a small contribution at the extreme posterior part by the orbital lamina of palatine. Enlow adduces the "V" principle to explain how accretion on the inner aspect of the orbital roof and floor, reciprocal to resorption on the opposite side of these bony plates, can still coexist with enlargement of the cavity. Some of the grossest orbital malformations occur in holoprosencephaly. Orbital hypertelorism—an increased interorbital distance—is a feature of many of the abnormal craniofacial syndromes.
Sinuses – Occipito-Mental
A Stewart Whitley, Charles Sloane, Gail Jefferson, Ken Holmes, Craig Anderson in Clark's Pocket Handbook for Radiographers, 2016
This projection is designed to project the petrous part of the temporal bone below the floor of the maxillary sinuses so that fluid levels or pathological changes in the lower part of the sinuses can be clearly visualised.
Nasopharynx, auditory tube, neurovascular supply of nasal cavity and nasopharynx, maxillary nerve
Ian Parkin, Bari Logan, Mark McCarthy in Core Anatomy - Illustrated, 2007
The equivalent nerves are sphenopalatine and nasal branches of the maxillary nerve posteriorly, and anterior ethmoidal branches of the nasociliary (a branch of V1) anteriorly. Maxillary nerve (V2) – The maxillary nerve is a sensory nerve that has ‘picked-up’ postganglionic secretomotor fibres from the pterygopalatine ganglion. Before passing into the inferior orbital fissure to become the infra-orbital nerve, the maxillary gives a zygomatic branch and the posterior, superior dental (alveolar) nerves. The latter, along with other superior dental nerves that arise from the infra-orbital and pass in the wall of the maxillary sinus (giving the sinus its sensation and secretomotor supply) provide sensation to the upper teeth.
Rapid remodeling of the maxillary sinus in silent sinus syndrome
Published in Orbit, 2019
Jacqueline M. Jacobs, Eva L. Chou, Nathan T. Tagg
Silent sinus syndrome (SSS) is a rare disorder involving bony remodeling of the maxillary sinuses, including collapse of the orbital floor. It is typically unilateral and seen in the setting of chronic maxillary sinusitis. Patients present with enophthalmos and hypoglobus occasionally accompanied by diplopia. The condition is generally diagnosed with CT imaging and treated surgically. While SSS is most often reported as very slowly progressive, we report a patient with evidence of significant remodeling of the maxillary sinus over a period of 5.5 months.
Nonhealing orbital floor fracture in a pediatric patient: A unique presentation of pseudo-silent sinus syndrome
Published in Orbit, 2018
Siwei Zhou, Katherine Duncan, S. Tonya Stefko
Silent sinus syndrome was first described as spontaneous enophthalmos and hypoglobus associated with subclinical maxillary sinusitis without prior trauma or surgery. This clinical entity has later been described after trauma in which damage to the ostiomeatal complex leads to atelectasis of the maxillary sinus. We report a case of a 14-year-old boy who presented 4 years after sustaining a non-operative orbital floor fracture with enophthalmos and transient diplopia. Computed tomography (CT) demonstrated enlargement in size of the original orbital floor fracture and bilateral maxillary sinus disease. Bilateral chronic sinusitis suggested an anatomical predisposition to sinusitis unrelated to the prior trauma. The authors propose that, in this case, negative pressure in the maxillary sinus and chronic inflammation led to bone resorption and failure of the orbital fracture to heal. This differs from prior reports of silent sinus syndrome in that there was complete resorption of bone of the orbital floor and no decrease in volume of the maxillary sinus given the open communication of the sinus and the orbit, making this a unique presentation of pseudo-silent sinus syndrome in a pediatric patient.
The effect of maxillary sinus surgery on its development
Published in Acta Oto-Laryngologica, 2008
Osman Bahadir, Aysenur Bahadir, Polat Kosucu, Murat Livaoglu
Conclusion. The study showed that surgery in the maxillary sinus can affect its development. Objective. To quantitatively evaluate the long-term impact of sinus surgery on its development in the rabbit. Materials and methods. This was an experimental study performed at an academic tertiary medical center using 20 4-week-old New Zealand white rabbits. The rabbits underwent unilateral right maxillary sinus surgery. The contralateral maxillary sinus used as a control did not undergo the operation. The maxillary sinus ostium was enlarged on the operated side. Volumetric analysis of the maxillary sinus was performed 1 year post-surgery. The maxillary sinus volumes of both sides were calculated using Multidedector CT and the volumetric measurements of the operated side were compared with the non-operated side. Results. Maxillary sinus development was significantly reduced on the surgical side. Maxillary sinus growth on the surgical side was determined as 87% compared with the non-surgical side.
Related Knowledge Centers
- Ethmoid Sinus
- Nasal Mucosa
- Paranasal Sinuses
- Sphenoid Sinus
- Nasal Cavity
- Maxillary Bone
- Sinuses