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Wednesday, June 13, 2012

SKULL

                                     
  Skull the skeleton of the head, consisting of the CRANIUM and the MANDIBLE. The cranium forms the domed top, back,and sides of the skull:several of its bones are large,smooth,gently curved, and connected to each other by dovetailed joints called sutures, Which permit no movement and make the mature skull rigid They protect the brain, with their curved exterior serving to deflect blows; the eyes,eras,and nose are also protected by being recessed into the skull and surrounded by bone


A birth the skull joints are flexible, head can be compressed as it emerges from the birth canal.The joints remain flexible to allow expansion until the cranial. bones are fully formed, around the second year of life

An infant"skull contains soft areas, or FANTANELS, where the bones of the cranium of not meet, The skull is supported by the highest vertebra, called the atlas. This joint permits a back-and-forth, nodding motion The atlas turns on the vertebra below it,the axis,which allows the skull to turn from side  to side
                                DISORDERS OF THE
                                SKULL. The skull is rarely affected by disease.
                                Uncommon ones ;ike OSTEITIS
                                DEFORMANS and ACROMEGALY cause the bones to increase
                                in size.like other bones,the skull may be fractured by blows,falls,or other accidents,but skull fracture can be more dangerous because of its proximity to the brain.

Skull bones
  the bones of the skull are the basisphenoid,ethmoid,frontal,hyoid incisive,interparietal,lacrimal,nasal,conchal,palatine,parietal,presphenoid,pterygoid,sphenoid,temporal,vomer and zygomatic,
brachycephalic
skull
short,broad skull.
dolicocephalic
skull
a medium skull in terms of width and length
skull symmetry
asymmetry common only in foals in which  the lower part of the face is deviated to one side involving mandibles,maxillae and nasal bones

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