Ethmoid bone

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Bone: Ethmoid bone
Cranial bones
The seven bones which articulate to form the orbit. (Ethmoid is brown)
Latin	os ethmoidale
Gray's	subject #36 153
MeSH	Ethmoid+bone

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Evidence Based Medicine
Cochrane Collaboration on Ethmoid bone Bandolier on Ethmoid bone TRIP on Ethmoid bone
Clinical Trials
Ongoing Trials on Ethmoid bone at Clinical Trials.gov Trial results on Ethmoid bone Clinical Trials on Ethmoid bone at Google
Guidelines / Policies / Govt
US National Guidelines Clearinghouse on Ethmoid bone NICE Guidance on Ethmoid bone NHS PRODIGY Guidance FDA on Ethmoid bone CDC on Ethmoid bone
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Books on Ethmoid bone
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Commentary
Blogs on Ethmoid bone
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Definitions of Ethmoid bone
Patient Resources / Community
Patient resources on Ethmoid bone Discussion groups on Ethmoid bone Patient Handouts on Ethmoid bone Directions to Hospitals Treating Ethmoid bone Risk calculators and risk factors for Ethmoid bone
Healthcare Provider Resources
Symptoms of Ethmoid bone Causes & Risk Factors for Ethmoid bone Diagnostic studies for Ethmoid bone Treatment of Ethmoid bone
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CME Programs on Ethmoid bone
International
Ethmoid bone en Espanol Ethmoid bone en Francais
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Ethmoid bone in the Marketplace Patents on Ethmoid bone
Experimental / Informatics
List of terms related to Ethmoid bone

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Overview

The ethmoid bone (from Greek ethmos, "sieve") is a bone in the skull that separates the nasal cavity from the brain. As such, it is located at the roof of the nose, between the two orbits. The cubical bone is lightweight due to a spongy construction.

Parts

The ethmoid bone consists of four parts:

• the horizontal Cribriform plate (lamina cribrosa), part of the cranial base
• the vertical Perpendicular plate (lamina perpendicularis), which is part of the nasal septum
• the two lateral masses or labyrinths.

Articulations

The ethmoid articulates with fifteen bones:

• four of the cranium—the frontal, the sphenoid, and the two sphenoidal conchae
• eleven of the face—the two nasals, two maxillae, two lacrimals, two palatines, two inferior nasal conchae, and the vomer

Injuries

The ethmoid bone is very delicate and is easily injured by a sharp upward blow to the nose, such as a person might suffer by striking an automobile dashboard in a collision. The force of a blow can drive bone fragments through the cribiform plate into the meninges or brain tissue. Such injuries are often evidenced by leakage of cerebrospinal fluid into the nasal cavity, and may be followed from the nasal cavity to the brain.

Blows to the head can also shear off the olfactory nerves that pass though the ethmoid bone and cause anosmia, an irreversible loss of the sense of smell and a great reduction in the sense of taste (most of which depends on smell). This not only deprives life of some of its pleasures, but can also be dangerous, as when a person fails to smell smoke, gas, or spoiled food.

Fracture of the lamina papyracea, the lateral plate of the ethmoid labyrinth bone, permits communication between the nasal cavity and the ipsilateral orbit through the inferomedial orbital wall, resulting in orbital emphysema. Increased pressure within the nasal cavity, as seen during sneezing, for example, leads to temporary exophthalmos.

Role in magnetoception

Some birds and other migratory animals have deposits of biological magnetite in their ethmoid bones which allow them to sense the direction of the Earth's magnetic field. Humans have a similar magnetite deposit, but it is believed to be vestigial. [4]

Additional images

Ethmoid bone from above.	Perpendicular plate of ethmoid.	Ethmoid bone (frontal view).	Ethmoid bone from the right side.
Sphenoid bone visible center right.	Side view of the skull.	The skull from the front.	Medial wall of left orbit.
Base of the skull. Upper surface.	Medial wall of left nasal fossa.	Roof, floor, and lateral wall of left nasal cavity.	Lateral wall of nasal cavity, showing ethmoid bone in position.

See also

• Ossification of ethmoid
• Bone terminology
• Terms for anatomical location

External links

• http://www.theregister.com/2006/11/17/the_odd_body_nose_compass/
• Roche Lexicon - illustrated navigator, at Elsevier 34256.000-1

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

v • d • e The Bones which form the Orbit
Frontal bone • Zygomatic bone • Maxillary bone • Sphenoid bone • Ethmoid bone • Palatine bone • Lacrimal bone

v • d • e Bones of head and neck: the cranium of the skull
Occipital	Squama external (Inion/External occipital protuberance, Nuchal lines) - planes (Occipital, Nuchal) - internal (Cruciform eminence, Internal occipital protuberance, Sagittal sulcus, Internal occipital crest) Lateral parts Condyle (Condyloid fossa, Condylar canal) - Hypoglossal canal - jugular (Jugular process, Jugular tubercle) Basilar part Pharyngeal tubercle Other Foramen magnum
Parietal	Parietal eminence - Temporal line - Parietal foramen
Frontal	Squama Frontal suture - Frontal eminence - external (Superciliary arches, Glabella) - foramina (Supraorbital, Cecum) - Zygomatic process - internal (Sagittal sulcus, Frontal crest) Orbital part Ethmoidal notch - Lacrimal fossa - Trochlear fovea - Frontal sinus - Frontonasal duct
Temporal	Squama Articular tubercle - Suprameatal triangle - Mandibular fossa - Petrotympanic fissure - Zygomatic process Mastoid part Mastoid foramen - Mastoid process (Mastoid cells) - Mastoid notch - Occipital groove - Sigmoid sulcus - Mastoid antrum (Entrance) Petrous part Carotid canal - Facial canal (Hiatus) - Internal auditory meatus - Aqueduct of cochlea - Stylomastoid foramen fossae (Subarcuate fossa, Jugular fossa) - canaliculi (Inferior tympanic, Mastoid) - Styloid process - Petrosquamous suture (note: ossicles in petrous part, but not part of temporal bone) Tympanic part Suprameatal spine
Sphenoid	Surfaces Superior surface: Sella turcica (Dorsum sellae, Tuberculum sellae, Hypophysial fossa, Posterior clinoid processes) - Ethmoidal spine - Chiasmatic groove - Middle clinoid process - Petrosal process - Clivus Lateral surface: Carotid groove - Sphenoidal lingula Anterior surface: Sphenoidal sinuses Great wings foramina (Rotundum, Ovale, Vesalii, Spinosum) - Spine - Infratemporal crest - Sulcus for auditory tube Small wings Superior orbital fissure - Anterior clinoid process - Optic canal Pterygoid processes fossae (Pterygoid, Scaphoid) - pterygoid plates (Lateral, Medial) - Pterygoid canal - Hamulus Other Body - Sphenoidal conchae
Ethmoid	Plates Cribriform plate (Crista galli, Olfactory foramina) - Perpendicular plate Surfaces Lateral surface Orbital lamina - Uncinate process Medial surface Superior nasal concha - Superior meatus - Middle nasal concha - Middle meatus Labyrinth Ethmoid sinus - ethmoidal foramina (Posterior, Anterior)

v • d • e WikiDoc Research Resources for Ethmoid bone
Articles on Ethmoid bone	Most recent articles on Ethmoid bone • Most cited articles on Ethmoid bone • Review articles on Ethmoid bone • Articles on Ethmoid bone in N Eng J Med, Lancet, BMJ
Media (Slides, Video, Images, MP3) on Ethmoid bone	Powerpoint slides on Ethmoid bone • Images of Ethmoid bone • Photos of Ethmoid bone • Podcasts & MP3s on Ethmoid bone • Videos on Ethmoid bone
Evidence Based Medicine Regarding Ethmoid bone	Cochrane Collaboration on Ethmoid bone • Bandolier on Ethmoid bone • TRIP on Ethmoid bone
Cost Effectiveness of Ethmoid bone	Cost Effectiveness of Ethmoid bone
Clinical Trials Involving Ethmoid bone	Ongoing Trials on Ethmoid bone at Clinical Trials.gov • Trial results on Ethmoid bone • Clinical Trials on Ethmoid bone at Google
Guidelines / Policies / Government Resources (FDA/CDC) Regarding Ethmoid bone	US National Guidelines Clearinghouse on Ethmoid bone • NICE Guidance on Ethmoid bone • NHS PRODIGY Guidance • FDA on Ethmoid bone • CDC on Ethmoid bone
Textbook Information on Ethmoid bone	Books and Textbook Information on Ethmoid bone
Pharmacology Resources on Ethmoid bone	Dosing of Ethmoid bone • Drug interactions with Ethmoid bone • Side effects of Ethmoid bone • Allergic reactions to Ethmoid bone • Overdose information on Ethmoid bone • Carcinogenicity information on Ethmoid bone • Ethmoid bone in pregnancy • Pharmacokinetics of Ethmoid bone •
Genetics, Pharmacogenomics, and Proteinomics of Ethmoid bone	Genetics of Ethmoid bone • Pharmacogenomics of Ethmoid bone • Proteomics of Ethmoid bone
Newstories on Ethmoid bone	Ethmoid bone in the news • Be alerted to news on Ethmoid bone • News trends on Ethmoid bone
Commentary on Ethmoid bone	Blogs on Ethmoid bone
Patient Resources on Ethmoid bone	Patient resources on Ethmoid bone • Discussion groups on Ethmoid bone • Patient Handouts on Ethmoid bone • Directions to Hospitals Treating Ethmoid bone • Risk calculators and risk factors for Ethmoid bone
Healthcare Provider Resources on Ethmoid bone	Symptoms of Ethmoid bone • Causes & Risk Factors for Ethmoid bone • Diagnostic studies for Ethmoid bone • Treatment of Ethmoid bone
Continuing Medical Education (CME) Programs on Ethmoid bone	CME Programs on Ethmoid bone
International Resources on Ethmoid bone	Ethmoid bone en Espanol • Ethmoid bone en Francais
Business Resources on Ethmoid bone	Ethmoid bone in the Marketplace • Patents on Ethmoid bone
Informatics Resources on Ethmoid bone	List of terms related to Ethmoid bone

ar:عظم غربالي

ca:Etmoide de:Siebbeinfr:Os ethmoïde it:Osso etmoide lv:Sietiņkauls lt:Akytkaulis nl:Zeefbeen ja:篩骨simple:Ethmoid bone sl:Sitka uk:Ґратчаста кістка

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Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .