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===Ethmoid Bone (os ethmoidale)===
 
===Ethmoid Bone (os ethmoidale)===
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[[Image:Nasal Cavities.jpg|thumb|right|150px|Nasal Cavities - Copyright David Bainbridge]]
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*Forms part of the cranial and facial parts of the skull
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*Located deep in the orbit
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*External lamina consists of the roof plate, floor plate and paired orbital plates
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*The ethmoid bone is separated from the cranial cavity by the cribiform plate
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**Numerous small foramina where the olfactory nerve ([[Nervous System - CNS - Anatomy & Physiology#Innervation - Cranial Nerves|CN I]]) passes through
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*The perpendicular plate splits the ethmoid into two halves
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*The ethmoid larbyrinth prodrudes from the ethmoid tubes
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**Composed of two rows of ethmoturbinates and air filled ethmoidal meatuses
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**Secondary ethmoturbinates may also be present
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*Ethmoturbinates divided into endoturbinates and ectoturbinates
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**The first endoturbinate forms the dorsal nasal conchae
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**The second endoturbinate froms the middle nasal conchae
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*The endoturbinates form 3 nasal meatuses
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**Dorsal nasal meatus
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**Middle nasal meatus
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**Ventral nasal meatus
    
===Nasal Bone (os nasale)===
 
===Nasal Bone (os nasale)===
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===Maxilla===
 
===Maxilla===
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*Forms the ventral nasal conchae
    
===Mandible (mandibula)===
 
===Mandible (mandibula)===
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*Zygomatic process articulates with the zygomatic process of the temporal bone
 
*Zygomatic process articulates with the zygomatic process of the temporal bone
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*Three rows of ethmoturbinates present
 
[[Image:Sheep skull.jpg|thumb|right|150px|Sheep skull - Copyright RVC]]
 
[[Image:Sheep skull.jpg|thumb|right|150px|Sheep skull - Copyright RVC]]
 
===Ruminant===
 
===Ruminant===
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