Gross and microscopic structure of bone part 1

Question 1

What are the functions of bones?

Answer 1

1) Support for the body

2) Protection of vital structures

3) Mechanical basis of movement

4) Storage for salts

5( Bone marrow supplies the body with new blood cells

Question 2

How many bones does our body contain?

Answer 2

206

Question 3

What are the two classification of bones in our body?

Answer 3

1) Axial skeleton (head and trunk) - 80 bones
* Skull: cranium (8), facial bones (14)
* Auditory ossicles (6)
* Hyoid (1)
* Vertebral column (26)
* Thoracic cage (ribs & sternum) (25)

2) Appendicular skeleton (limbs) - 126 bones
* Pectoral girdle (4)
* Upper extremities (60)
* Pelvic girdle (2)
* Lower extremities (60)

Question 4

What are the divisions of the vertebral column?

Answer 4

• Divided into 32-33 pieces

1) 7 Cervical
2) 12 Thoracic
3) 5 Lumbar
4) 5 Sacral (fused together to form a sacrum)
5) 3-4 Coccygeal (fused together to form the coccyx)

Question 5

What are the different shape classification of bones?

Answer 5

1) Flat bones (cranial bones, sternum)
2) Long bones (Humerus)
3) Irregular bone (vertebra)
4) Sesamoid bone “develops inside a tendon of a muscle” (patella)
5) Short bone (trapezoid, wrist bone)