AP_Skeletal_System_Lab_Notes - Skeletal System 206 total bones Skeletal System divided into axial skeleton and appendicular skeleton Axial Skeleton \u25cf

AP_Skeletal_System_Lab_Notes - Skeletal System 206 total...

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Skeletal System 206 total bones Skeletal System divided into axial skeleton and appendicular skeleton Axial Skeleton Skull Vertebral column Ribcage Sternum Auditory ossicles (bones in ear) Hyoid bone (small floating bone in neck) Skull (sutures divide bones of the skull and serve as landmarks and divisions of the fused bones of the skull) as an infant, these bones are not fully fused; as we age sutures ossify into solid bone so there’s no movement in bones of the skull as an adult Coronal suture - suture that comes across the skull (from right to left near temple); divides frontal bone from two parietal bones Mid-sagittal suture - goes down the middle of the skull, divides the parietal bones ( **remember that word sagittal means to divide a cavity or body into two halves and mid-sagittal means to divide into two EQUAL halves) Lambdoidal suture - on posterior of skull (visualize a similar line on posterior skull from right to left) divides the occipital bones from parietal bones Squamosal suture - on both sides of skull, divides temporal bone from parietal bones Cranial bones Frontal bone - forms forehead (on the video, frontal bone is yellow) Parietal bone s - form cap of skull, there are two parietal bones Occipital bone - found on posterior side of skull (directly above the neck) Temporal bone s - found laterally above ears, there are two temporal bones Sphenoid bone - found inside the skull in the middle of the skull, shaped like butterfly; there is a pit (or hypophyseal fossa ) in the middle of sphenoid bone where the pituitary gland sits; gain access to sphenoid bone through the nose especially for surgery to remove a tumor or part of pituitary gland if necessary Ethmoid bone - found inside the skull , the piece of the bone that you can see is called the crystigally which is a small plate found right above the nose; this sharp plate can be forced into the brain tissue (commonly taught as a self-defense move by striking a blow through the nose - a diagonal blow upward) Facial bones Zygomatic bone - cheek bone, runs all the way up to around the eye

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