6,273
edits
Changes
Skull and Facial Muscles - Anatomy & Physiology (view source)
Revision as of 19:32, 23 January 2011
, 19:32, 23 January 2011→Species Differences
===Porcine===
===Porcine===
Pigs have a thick nucal crest and an '''internal sagittal crest''' on the internal surface of the pareital bone. They have a prominent '''temporal line''' and their orbit is incomplete and small. There is a strong and deep zygomatic arch, large tympanic bullae and a high caudal part of the skull. The styloid process absent.
<br />
<br />
[[Image:Bird skull.jpg|thumb|right|150px|Bird skull - Copyright nabrown RVC]]
[[Image:Bird skull.jpg|thumb|right|150px|Bird skull - Copyright nabrown RVC]]
===Avian===
===Avian===
Birds have '''pneumatised skull bones''' which connect to airways in the head rather than the air sacs. They have large orbits and their skull plates are separated by spongy bone. A '''single occipital condyle''' articulates with the '''atlas''' allowing more rotation of the head. In parrots, the nasal bone and frontal bone are joined by a flexible cartliage structure allowing greater jaw opening which is called the craniofacial hinge. This allows kinesis to occur. Birds have thin '''jugal arches''' (equivalent to zygomatic arch) and the middle ear contains only the columella (equivalent to the stapes).
<br />
<br />
==Test yourself with our Skull and Facial Muscles Flashcards==
==Test yourself with our Skull and Facial Muscles Flashcards==