Search results
Results from the WOW.Com Content Network
An orbital blowout fracture is a traumatic deformity of the orbital floor or medial wall that typically results from the impact of a blunt object larger than the orbital aperture, or eye socket. [1] Most commonly this results in a herniation of orbital contents through the orbital fractures. [ 1 ]
The porous fragile nature of the ethmoid bone makes it particularly susceptible to fractures. The ethmoid is usually fractured from an upward force to the nose. This could occur by hitting the dashboard in a car crash or landing on the ground after a fall. The ethmoid fracture can produce bone fragments that penetrate the cribriform plate.
The formerly used 'tripod fracture' refers to these buttresses, but did not also incorporate the posterior relationship of the zygoma to the sphenoid bone at the zygomaticosphenoid suture. [citation needed] There is an association of ZMC fractures with naso-orbito-ethmoidal fractures (NOE) on the same side as the injury.
A basilar skull fracture typically requires a significant degree of trauma to occur. [1] It is defined as a fracture of one or more of the temporal, occipital, sphenoid, frontal or ethmoid bone. [1] Basilar skull fractures are divided into anterior fossa, middle fossa and posterior fossa fractures. [1] Facial fractures often also occur. [1]
The ethmoidal air cells receive sensory innervation from the anterior and the posterior ethmoidal nerve (which are ultimately derived from the ophthalmic branch (CN V 1) of the trigeminal nerve (CN V)), [3] and the orbital branches of the pterygopalatine ganglion, which carry the postganglionic parasympathetic nerve fibers for mucous secretion ...
The nasociliary nerve enters the orbit via the superior orbital fissure, [citation needed] through the common tendinous ring, [1] and between the two heads of the lateral rectus muscle and between the superior and inferior rami of the oculomotor nerve. [citation needed] It passes across the optic nerve (CN II) along with the ophthalmic artery.
This space continues laterally as a three-dimensional slit-like space - the ethmoidal infundibulum. This is bounded by the uncinate process, medially, the orbital lamina of ethmoid bone (lamina papyracea), laterally, and the ethmoidal bulla, posterosuperiorly. This concept is easier to understand if one imagine the infundibulum as a prism so ...
The frontonasal duct passes inferior-ward [5] to open either [3] into the middle nasal meatus at the anterior end of [3] the ethmoidal infundibulum, [3] [5] [2] or into the anterior ethmoidal air cells (which then in turn drain into the nasal cavity). [3] The duct is lined by mucous membrane. [citation needed]