BIOB33H3 Lecture Notes - Lecture 5: Foramen Magnum, Skeleton, Thymus

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24 Oct 2013
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The skeletal system: axial & appendicular divisions (based on chapters 6, 7 and 8) The skeleton is divided into 2 portions: the axial skeleton and the appendicular skeleton: it is a rigid framework of 206 bones , muscles and organs are attached by tendons and ligaments. 300+ bones in in child skeleton, but bones fuse together: bones act as levers (with joints acting as pivots) when muscles contract and move body. The axial skeleton: - composed of bones along the central axis of the body 80 bones: divided into three regions, skull brain case, protects the brain, vertebral column, thoracic cage. Pelvic bones protect the urinary tract and reproductive organs. The skull and associated bones: cranial and facial subdivisions of the skull. Mandibular joint is associated top of jaw does not move, bottom jaw to stop: occipital bone (1) back of head, foramen (opening) magnum connects cranial cavity moving when touches top jaw with spinal cavity.

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