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Cranium (skull) In the axial skeletonof vertebrates, the bony structure that encases the brain. The cranium comprises three parts: dermatocranium; chondrocranium; and splanchnocranium. The dermatocranium is derived from the neural crest cells of the integumentand includes the roof of the cranium, the area around the orbits, and the jaw.

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Osteoblast, large cell responsible for the synthesis and mineralization of bone during both initial bone formation and later bone remodeling. Osteoblasts form a closely packed sheet on the surface of the bone, from which cellular processes extend through the developing bone. They arise from the differentiation of osteogenic cells in the periosteum, the tissue that covers the outer surface of the bone, and in the endosteum of the marrow cavity. This cell differentiation requires a regular supply of blood, without which cartilage-forming chondroblasts, rather than osteoblasts, are formed.

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6.Calcium and how it relates to the skeletal         system.

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6.Calcium and how it relates to the skeletal         system.

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Calcium and vitamin D work together to help protect your bones-calcium helps build and maintain the bones, while vitamin D helps your body effectively absorb calcium.Calcium also helps you ward off osteoporosis.Your bones contain 99.5% of the total calcium in your body.

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Phalanges are the bones that make up the digits of the hand or foot in the vertebrates.They articulate with the metacarpals of the hand or with the metatarsals of the foot.The phalanges of the hand are commonly known as the finger bones.

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The metatarsus or metatarsal bones are a group of 5 long bones in the foot.The bones are located in between the tarsal bones of the hind,mid-foot and the phalanges of the toes.The metatarsals are like the metacarpal bones of the hand.

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Tarsal,any of several short, angular bones that in human make up the ankle.The tarsal is combined with the metatarsal bones.The tarsal bone or ankle is located at the foot.

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The pelvis is a basin-shaped structure that supports the spinal column and protects the abdominal organs.The pelvis contain the sacrum and coccyx bones.The pelvic girdle or the hip circle is formed by a single bone, the hip bone or coral bone,serves  as the attachment point for each lower limb.

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One of the bones that does a lot for us is the mandible, or the jaw.The mandible is the bone that provides the power behind the chewing motion that is the part of eating.Mandibles also helps us be able to form words and talk.