Skeletal System

Skeletal System

Function of Skeletal System

Function of the Skeletal System

A. Protection

B. Movement

C. Support

D. Blood cell formation (hematopoiesis)

E. Storage (fat and minerals)

Structure of the Skeletal System

Axial Appendicular

http://www.zoology.ubc.ca/~biomania/tutorial/bonesk/outline.htm

The Structure of Bone:Compact Bone & Spongy Bone

Compact bone• Forms outer part of bones• Bears weight

Spongy bone• Made of trabeculae

(latticework) • Located inside bones• Reduces weight of bone

Spongy or Compact?

4 Types of Bone Shapes

• Long bones

• Short bones

• Flat bones

• Irregular bones

Anatomy of a Long Bone

epiphysis (head)

diaphysis (shaft)

epiphysis

Bone is a Living Tissue!!!

Bone is a Living Tissue!!!

1. It is made of living cells embedded in a non-living matrix.

2. It grows, remodels and repairs.

3. It responds to hormonal stimulation.

Made of Living Cells

Osteon

Lacunae

Canniculi

Matrix- minerals

- proteins

**strength and flexibility

Bone Cells Types

• Osteoblast – bone builders – form matrix

• Osteocyte – bone maintainers – maintain matrix

• Osteoclast – bone dissolvers – destroy matrix

Bone is a Living Tissue!!!

1. It is made of living cells embedded in a non-living matrix.

2. It grows, remodels and repairs.

3. It responds to hormonal stimulation.

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Bone Formation

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Bone Repair

Bone is a Living Tissue!

1. It is made of living cells embedded in a non-living matrix.

2. It grows, remodels and repairs.

3. It responds to hormonal stimulation.

Bone - Review:

• Bone cells

• Matrix

• Membranes

• Ligaments

• Cartilage