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Skeletal system _pdp_sq_ (General structure and division of the bones…

- - - - Under the sponge bone there is a medially cavity, where red or yellow marrow is placed
        
        Medullary cavity is padded out with the endosteum- thin, connective membrane
      - Compact bone is surrounded by the periosteum
        
        Periosteum is richly vascularized and innervated, it is responsible for the bone protection and supplying with all necessary ingredients
      - The whole bone is made of small units called osteons
- - - - The whole spine can be divided into 5 parts
        
        Coccyx
        
        Made of 4 fused bones Co1- Co4
        
        The structure of coccyx
        
        Sacrum
        
        Made of 5 fused bones S1- S5
        
        The structure of the sacrum
        
        Lumbar
        
        L1- L5
        
        Typical strucutre of lumbar vertebrae
        
        Thoracic
        
        Th1- Th12
        
        Typical thoracic vertebrae
        
        Th11 and Th12 have entire costal facets
        
        Cervical
        
        C1- C7
        
        Structure of C1 Atlas
        
        Structur of C2 Axis
        
        C7
  - - - Ribcage
        
        There are 7 pair of ribs attached to sternum directly. They are called true ribs
        
        3 another ribs are called false ribs, because they are attached to 7th via cartilage
        
        Remaining 2 ribs are known as the floating ribs, which are not attached to sternum
        
        Simple rib image