Bones of skull and intro

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Wilfrid Laurier University
Health Sciences
Health Sciences 2300A/B
Jamie Melling

Bones / Skeleton: - Functions: Provide support for the body - Sites for muscle attachment - Protection for certain organs - Produce red blood cells from bone marrow (hemopoietic tissue  blood-cell forming tissue) - Acts as a storage medium and buffer system for calcium (homeostasis) - Classification: Classified according to the type of bone tissue (compact or spongy) - Classified by the morphology of the bone (short  hands, irregular  vertebrae, long  tibia, flat  skull) TheAxial Skeleton: - Axial: MeansAxis Like - Composed Of: Skull, Vertebrae, Thorax The Skull: - The brain’s protective shell - Cranial Cavity: Cavity created by the skull bones, where the brain sits - Sutures: Joints where skull bones articulate (synarthrodial articulation) - Synarthrodial: Unmovable joint - Amphithrodial: Joint that permits little movement - Diarthrodial: Joint that permits lots of movement - Sutures fuse together in early childhood - Foramen: Naturally occurring holes within a bone Bones of the Skull: - Divided into cranium bones and facial bones Neurocranium Bones (8): - Parietal (2): Two bones that cover the parietal region of the brain connected by the sagital suture - Temporal (2): Two bones that cover the temporal region of the brain - Contains external ear, mastoid process (larger bump), styloid process (pen-like bump) - Mastoid and Styloid Processes serve as places where muscles attach - Frontal: Bone that covers the frontal region of the brain, separated by parietal bone by frontal suture - Sphenoid: Bat-like bone that covers the floor of the cranial cavity from left to right - Ethmoid: Bone that makes up the roof of the cranial cavity - Occipital: Bone that covers the occipital portion of the brain - Pterion: ‘The Boxer’s Temple’Area where temporal, parietal, frontal, and sphenoid bones meet - Is a vulnerable area because the Middle MenengealArtery lies just inferiorally to it - Lamboidal Suture: Separates parietal and occipital bones - Squamous Suture: Separates parietal and temporal bones Facial Bones (14): - Mandible: Lower jaw bone,
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