Independent work of students of English Prepared by:, 09-022 OM Checked by: Totanova Nazgul

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Skeletal System - Functions Support & shape to body Protection of

Skeletal System - Functions

Support & shape to body
Protection of internal organs
Movement

in union with muscles
Storage of minerals (calcium, phosphorus) & lipids
Blood cell production
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The Skeletal System Know the Skeletal Anatomy Axial Skeleton Appendicular Skeleton

The Skeletal System

Know the Skeletal Anatomy
Axial Skeleton
Appendicular Skeleton
Surface Anatomy of the

bone
By x-ray or diagram
Structure/function of joints, muscle and ligament attachments
Including range of motion
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Human Skeleton 206 Bones Axial skeleton: (80 bones) in skull, vertebrae,

Human Skeleton

206 Bones
Axial skeleton: (80 bones) in skull, vertebrae, ribs,

sternum, hyoid bone
Appendicular Skeleton: (126 bones)- upper & lower extremities plus two girdles
Half of bones in hands & feet
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Axial Skeleton (80) Skull Ossicles of the middle ear Hyoid bone Thorax or chest Vertebral column

Axial Skeleton (80)

Skull
Ossicles of the middle ear
Hyoid bone
Thorax or

chest
Vertebral column
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Appendicular Skeleton (126) Upper Extremity (64) Shoulder Girdle Arms Hands Lower

Appendicular Skeleton (126)

Upper Extremity (64)
Shoulder Girdle
Arms
Hands
Lower Extremity (62)
Pelvic Girdle
Legs
Feet

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Types of Bone Long bones: longer than they are wide; shaft

Types of Bone

Long bones: longer than they are wide; shaft

& 2 ends (e.g.: bones of arms & legs,except wrist, ankle & patella)
Short bones: roughly cube-shaped (e.g.: ankle & wrist bones)
Sesamoid bones: short bones within tendons (e.g.: patella)
Flat bones: thin, flat & often curved (e.g.,: sternum, scapulae, ribs & most skullbones)
Irregular bones: odd shapes; don't fit into other classes (e.g.: hip bones & vertebrae)
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22 bones in skull 6 in middle ears 1 hyoid bone

22 bones in skull
6 in middle ears
1 hyoid bone
26 in vertebral

column
25 in thoracic cage
4 in pectoral girdle
60 in upper limbs
60 in lower limbs
2 in pelvic girdle
206 bones in all
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The skull 8 sutured bones in cranium Facial bones: 13 sutured

The skull
8 sutured bones in cranium
Facial bones: 13 sutured bones,
1

mandible
Cranium
encases brain
attachments for muscles
sinuses
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Thoracic cage ribs thoracic vertebrae sternum costal cartilages True ribs are

Thoracic cage
ribs
thoracic vertebrae
sternum
costal cartilages
True ribs are

directly attached to the sternum (first seven pairs)
Three false ribs are joined to the 7th rib
Two pairs of floating ribs
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Vertebral column 7 cervial vertebrae 12 thoracic 5 lumbar 1 sacrum

Vertebral column
7 cervial vertebrae
12 thoracic
5 lumbar
1

sacrum (5 fused)
1 coccyx (4 fused)
Vertebrae vary in size and morphology
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Types of Vertebrae Cevical (7) Atlas Axis Thoracic (12) Lumbar (5)

Types of Vertebrae

Cevical (7)
Atlas
Axis
Thoracic (12)
Lumbar (5)

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Atlas – 1st; supports head Axis – 2nd; dens pivots to turn head Cervical Vertebrae

Atlas – 1st; supports head
Axis – 2nd; dens pivots

to turn head

Cervical Vertebrae

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long spinous processes rib facets Thoracic Vertebrae

long spinous
processes
rib facets

Thoracic Vertebrae

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large bodies thick, short spinous processes Lumbar Vertebrae

large bodies
thick, short spinous
processes

Lumbar Vertebrae

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Bone Cells Osteoblasts – bone forming cells synthesize and secrete unmineralized

Bone Cells
Osteoblasts – bone forming cells synthesize and secrete unmineralized

ground substance and are found in areas of high metabolism within the bone
Osteocytes – mature bone cells made from osteoblasts that have made bone tissue around themselves. They maintain healthy bone tissue by secreting enzymes and controlling the bone mineral content; they also control the calcium release from the bone tissue to the blood.
Osteogenic cells respond to traumas, such as fractures, by giving rise to bone-forming cells and bone-destroying cells
Osteoclasts – bone absorbing cell – large cells that break down bone tissue – important to growth, healing, remodeling
Bone lining cells - made from osteoblasts along the surface of most bones in an adult. Bone-lining cells are thought to regulate the movement of calcium and phosphate into and out of the bone