The Human Skull
5:46 AM Edit This 1 Comment ».svg)
Its human skull and it was for the last theme (I think) for this semester..but, don't worry because I love to do this blogging thing..so, hopefully in da future I can spend my time to post new theme and frequently updated..hehe..Insyaallah!
So, back to the human skull..In humans, the adult skull is normally made up of 22 bones. Except for the mandible, all of the bones of the skull are joined together by sutures, synarthrodial (immovable) joints formed by bony ossification, with Sharpey's fibres permitting some flexibility.
Eight bones form the neurocranium (brain case), a protective vault of bone surrounding the brain and brain stem.
Eight bones form the neurocranium (brain case), a protective vault of bone surrounding the brain and brain stem.
Fourteen bones form the splanchnocranium, which comprises the bones supporting the face. Encased within the temporal bones are the six auditory ossicles of the middle ear. The hyoid bone, supporting the larynx, is usually not considered as part of the skull, as it is the only bone that does not articulate with other bones of the skull.
The skull also contains the sinus cavities, which are air-filled cavities lined with respiratory epithelium, which also lines the large airways. The exact functions of the sinuses are debatable; they contribute to lessening the weight of the skull with a minimal reduction in strength, they contribute to resonance of the voice, and assist in the warming and moistening of air drawn in through the nasal cavities.
The meninges are three layers of connectivetissue surrounding structures of the central nervous system. From outermost to innermost layer, they are the dura mater, the arachnoid mater, and the pia mater. Each layer adds important protective and physiologic functions.
The anatomical position for the skull is the Frankfurt plane, where the lower margins of the orbits and the upper borders of the ear canals are all in a horizontal plane. This is the position where the subject is standing and looking directly forward. The Frankfurt plane may also be used to study the brains of other specifies, notably primates and hominids. However, this does not always equate to a natural posture in life.
It looks scary if we just watch the skull..especially in movies (scary one), but after we know how important the skull to human..what is the function and so on..we may find that..we have to be grateful for what god has created to us. Appreciate it and look after it!
See ya!
1 comments:
Thankx for you're explaination i like it and I like to study Human anatomy but, i have a question in here why mandible does'nt included to those bones which form the skull but, still it's funtion goes together with parts of the skull for example during mastication(chewing) mandible is only part which lotate and maxilla do not lotate so, i can say no mandible no chewing.
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