Skeletal System Chapter 6 and 7

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axial skeleton
Portion of the skeletal system that consists of the skull, rib cage, and vertebral column (long axis)
appendicular skeleton
Includes the bones of the shoulders, arms, hands, hips, legs, and feet (limbs and girdles)
axial skeleton
.Cranium (skull)
.Mandible (Jaw)
.vertebral column (spine)
-cervical vertebrae
-Thoracic Vertebrae
-lumbar vertebra
-sacrum
-coccyx
.Sternum (Breast Bone)
.Ribs
appendicular skeleton
.Clavicle (collar bone)
.Scapula (shoulder blade)
.Coxal (pelvic Girdle)
.
Functions of our bones
.Support body and cradle soft organs

.Protect: Vital organs

.Movement: muscles move bones

.Storage: of minerals (calcium, phosphorus) and growth factors

.Blood Cell Formation in bone marrow

triglyceride fat storage
Classifications of Bones
Long bones- longer than they are wide (femur, metacarpels)

Short bones-
Cube shaped bones (e.g wrist and ankle)
Sesamoid bones (within tendons - e.g patella)

Flat bones- thin flat slightly curved (sternum, skull)

Irregular Bones
complicated shapes (vertebrae, hips)
Skeletal Characteristics
Adult Human: 206 bones
Types of bone tissue:
Compact bone: Outerlayer dense and solid
Spongy Bones: inner layer - open spaces, marrow

Features: Light weight ability to resist tension and forces (collagen and fibers)
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