Question

Give a brief note on the human skeletal system.

Answer 1

Human skeleton system:

1. The skeleton system is a framework of 206 bones and a few cartilages.
2. It plays an important role in the movement of the body.
3. It is primarily grouped into 2 - the axial and the appendicular skeleton.

Axial skeleton:

1. The axial skeleton is composed of 80 bones that run along the main axis of the body.
2. There are 2 sets of bones present in the skull namely cranial and facial bones (29 bones).
3. Cranial bones - 8, facial bones - 14, hyoid - 1, ear ossicles - 6.
4. 26 bones form the vertebral column. The vertebral formula is $\mathrm{C}\left(7\right)\mathrm{T}\left(12\right)\mathrm{L}\left(5\right)\mathrm{S}(1-\mathrm{fused})\mathrm{C}(1-\mathrm{fused})$.
5. Sternum - 1 bone.
6. 12 pairs of ribs which are equal to 24 bones that compromise the rib cage.

Appendicular skeleton:

1. The appendicular skeleton is composed of 126 bones(120- limb bones and 6- girdles).
2. Each limb consists of 30 bones. this is equal to 120 bones as one human body has four limbs($30\times 4=120$).
3. The pelvic and pectoral girdle compromise 6 bones together.