Skeletal system 
Skeletal system as a whole
General structure and division of the bones
Growth in length and thickness
Bones of the spine and the chest
Palpable bone points in the human body
Appendicular skeleton
Axial skeleton
Skull
Ribcage
Spine
Shoulder girdle
Pelvic Girdle
Long bones
Short bones
Flat bones
The stucture
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
The whole bone is made of small units called osteons
Periosteum is richly vascularized and innervated, it is responsible for the bone protection and supplying with all necessary ingredients
Bone grows in length thanks to the epiphyseal line. It is made of cartilage, which has the ability to grow by mitosis
As far as the growth in thickness is concerned, it happens by dint of two simultaneuos processes
Osteoblasts, which are located in the periosteum, can form a compact bone due to stress and muscle activity
Osteoclasts inside the endosteum break down the inside surface of the bone. The process protects the bone from being excessively heavy
Spine
It is made of 33 bones stacked one on top of the other
The whole spine can be divided into 5 parts
Coccyx
Sacrum
Lumbar
Thoracic
Cervical
C1- C7
Th1- Th12
L1- L5
Made of 5 fused bones S1- S5
Made of 4 fused bones Co1- Co4
Structure of C1 Atlas
Structur of C2 Axis
Typical thoracic vertebrae
Typical strucutre of lumbar vertebrae
C7
Th11 and Th12 have entire costal facets
The structure of the sacrum
The structure of coccyx
Chest
Chest consists of 2 parts
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
Sternum