Dictionary » E » Ethmoid bone

Ethmoid bone

Definition

noun, plural: ethmoid bones

The light cubical spongy bone lying between the orbits and at the top of the nasal cavity


Supplement

The ethmoid bone is the bone in the skull located between the eyes, at the roof of the nose. It separates the nasal cavity from the brain and also forms part of the orbits.

It is made up of three parts, namely the cribriform plate, the ethmoidal labyrinths, and the perpendicular plate. The cribriform plate is the horizontal plate located within the middle section of the ethmoid bone. It has several perforations that allow the passage of olfactory nerve filaments from the nasal cavity. It also supports the olfactory bulb, which is the structure involved in olfaction. The ethmoidal labyrinths are paired lateral masses in the ethmoid bone. They are located laterally to the perpendicular plate. They contain series of ethmoid air cells that open into the nasal cavities. The perpendicular plate is the vertical plate that articulates with the vomer bone to form the nasal septum.

It articulates with these bones: frontal bone, body of the sphenoid bone, the sphenoidal conchae, nasal bones, maxillae, lacrimals, palatines, inferior nasal conchae, and vomer.

Baker et al. published a report suggesting that humans have deposits of ferric iron in the sphenoid/ethmoid sinus complex. These deposits may be magnetic and probably help to sense direction or to orient to ambient magnetic field.1


Word origin: Greek ethmos (sieve)

Also called:

  • os ethmoidale

See also:

Related term(s):

Reference(s):
1Baker RR, Mather JG, & Kennaugh JH. Magnetic bones in human sinuses. Nature 301, 78 - 80 (06 January 1983); doi:10.1038/301078a0. Source


Please contribute to this project, if you have more information about this term feel free to edit this page



Results from our forum


Re: The Axial Skeleton Helllllp!!??

relatively weak ethmoid bone full of holes before they enter your brain. the reason for the holes in the bone is that the olfactory ...

See entire post
by ahm_k1
Fri Mar 21, 2008 3:17 pm
 
Forum: Human Biology
Topic: The Axial Skeleton Helllllp!!??
Replies: 11
Views: 15174

Re: The Axial Skeleton Helllllp!!??

... clearly from anatomy textbooks. the main importance of the sphenoid bone that the pituitary gland lies over the sphenoid bone. the other important ... artery - branch of internal carotid artery) travel through these. the ethmoid bone forms the part of the eye socket and parts of the nose. it also ...

See entire post
by Revenged
Mon Feb 25, 2008 3:53 pm
 
Forum: Human Biology
Topic: The Axial Skeleton Helllllp!!??
Replies: 11
Views: 15174

The Axial Skeleton Helllllp!!??

what bone is single irregular bat shaped bone forming part of the cranial floor i have looked in my book and have found several answers do not know which is correct ethmoid or sphenoid or is it both

See entire post
by michelle4
Fri Feb 22, 2008 4:47 am
 
Forum: Human Biology
Topic: The Axial Skeleton Helllllp!!??
Replies: 11
Views: 15174


This page was last modified 10:46, 20 August 2014. This page has been accessed 2,961 times. 
What links here | Related changes | Permanent link