The skeleton makes up about 30-40% of an adult's body mass. The skeleton's mass is made up of nonliving bone matrix and many tiny bone cells. Roughly half of the bone matrix's mass is water, while the other half is collagen protein and solid crystals of calcium carbonate and calcium phosphate. Living bone cells … See more
The skull is composed of 22 bones that are fused together except for the mandible. These 21 fused bones are separate in children to allow the skull and brain to grow, but fuse to give … See more
The hyoid is a small, U-shaped bone found just inferior to the mandible. The hyoid is the only bone in the body that does not form a joint with any other bone---it is a floating bone. The hyoid's function … See more
Twenty-six vertebrae form the vertebral columnof the human body. They are named by region: 1. Cervical(neck) - 7 vertebrae 2. Thoracic(chest) - 12 vertebrae 3. Lumbar(lower back) - 5 vertebrae 4. Sacrum- 1 vertebra 5. Coccyx(tailbone) - 1 vertebra With the exception of the singular sacrum and coccyx, each vertebra is named for the first … See more
The sternum, or breastbone, is a thin, knife-shaped bone located along the midline of the anterior side of the thoracic region of the skeleton. The sternum connects to the ribs by thin bands of cartilage called the costal cartilage. There are 12 pairs of ribs that together with the sternum form the ribcage of the thoracic region. The first seven ri... See more
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