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Functions of the skeletal system
- Provides structural support for whole body
- Stores Minerals
- Produces red blood cells, white blood cells, and platelets in the marrow
- Protects delicate organs
- Provides leverage for movement
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Classifications of bone shape:
- Flat Bones
- Sutural Bones
- Long Bones
- Irregular Bones
- Sesamoid Bones
- Short Bones
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Flat Bone
Thin and flat bones of the skull, ribs, sternum, and scapulae
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Sutural Bones (wormian)
Small flat irregular bones that appear in sutures of the skull
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Long Bones
- Long bones of the:
- Legs
- Arms
- Fingers
- Toes
- Hands
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Irregular Bones
- Bones with complex shape like:
- vertebrae
- Ethmoid
- Pelvic bones
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Sesamoid Bone:
Form the patella
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Short Bones:
- Carpal Bones
- Tarsal Bones (ankle)
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Tubercle
Small rounded projection from a bone
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Sulcus
A deep narrow groove on a bone
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Diaphysis
the shaft of a bone
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Condyle
a smooth rounded articular process. (where two bones meet and articulate
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Trochlea
A smooth grooved articular process. Shaped like a pulley
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Tuberosity
- a small and rough projection on a broad area of a bone.
- Where tendons connect
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Facet
A flat articular surface
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Ramus
Extension of a bone that makes an angle with the rest of the structure
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Fossa
Shallow Depression or recess in the surface of a bone
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Epiphysis
Each end of a long bone
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Metaphysis
The midpoint between the shaft of a bone and the epiphysis
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Osteocyte
Mature bone cells that maintain their surrounding matrix
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Osteoblasts
Produce new bone matrix
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Osteoprogenitor
Mesenchimal (stem cells) important in the repair of bone injuries
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Osteoclasts
disolve matrix and release minerals
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appositional growth
where the bone increases in diameter as it grows
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Periostium
tissue that lines the outer surface of bones, has a fibrous and cellular layer
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endosteum
a cellular lining to the medullary cavity of bones
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endochondral ossification
the process of cartilage becoming bone. the cartilage allows bones to grow during infancy and adolescence.
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Calcitrol
stimulates calcium reabsorption
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parathyroid gland embeded in the thyroid (neck)
secretes parathyroid hormones that cause the body to increase calcium levels in the blood
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Calcitonin
- is secreted when calcium levels are too high. Cause kidneys to flush calcium
- Causes intestines to absorb less calcium
- Slows osteoclasts while leaving osteoblasts alone
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how many bones are in the body
roughly 206
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auditory ossicles
- three in each inner ear
- conduct vibrations produced by sound waves
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how many bones are in the appendicular skeleton
126
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How many bones are in the axial skeleton
80
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bones of the pelvic girdle
- the paired coxal bones:
- fused ilium, ischium, and pubis
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acetabulum
socket that articulates with the femur
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glenoid cavity
articulates with the humorous
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synarthosis
strong joints with no movement
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Amphiarthrosis
permits more movement than synarthrosis, but much stronger than free moving joint.
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diarthrosis
freely moving joint
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