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Skull and Facial Muscles - Anatomy & Physiology (view source)
Revision as of 14:22, 30 July 2008
, 14:22, 30 July 2008no edit summary
===Ethmoid Bone (os ethmoidale)===
===Ethmoid Bone (os ethmoidale)===
[[Image:Nasal Cavities.jpg|thumb|right|150px|Nasal Cavities - Copyright David Bainbridge]]
*Forms part of the cranial and facial parts of the skull
*
*Located deep in the orbit
*External lamina consists of the roof plate, floor plate and paired orbital plates
*The ethmoid bone is separated from the cranial cavity by the cribiform plate
**Numerous small foramina where the olfactory nerve ([[Nervous System - CNS - Anatomy & Physiology#Innervation - Cranial Nerves|CN I]]) passes through
*The perpendicular plate splits the ethmoid into two halves
*The ethmoid larbyrinth prodrudes from the ethmoid tubes
**Composed of two rows of ethmoturbinates and air filled ethmoidal meatuses
**Secondary ethmoturbinates may also be present
*Ethmoturbinates divided into endoturbinates and ectoturbinates
**The first endoturbinate forms the dorsal nasal conchae
**The second endoturbinate froms the middle nasal conchae
*The endoturbinates form 3 nasal meatuses
**Dorsal nasal meatus
**Middle nasal meatus
**Ventral nasal meatus
===Nasal Bone (os nasale)===
===Nasal Bone (os nasale)===
===Maxilla===
===Maxilla===
*Forms the ventral nasal conchae
===Mandible (mandibula)===
===Mandible (mandibula)===
*Zygomatic process articulates with the zygomatic process of the temporal bone
*Zygomatic process articulates with the zygomatic process of the temporal bone
*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===