Once Again: Skeletal System

      Today is Wednesday, you what that means right? Hump Day!! Well, today in class I learned more about the skeletal system and I completed an assignment on the skeletal system. The five major functions of the skeletal system is support, protection, storage of inorganic salts, body movement, and blood cell formation. There are 206 bones in your skeleton. I know some of these things I already told you in a previous blog but it is what I did in Science class on a worksheet. The groups of bones that makeup the Appendicular skeleton is the pectoral girdle and the pelvic girdle. The Axial skeleton consists of the bones; skull, hyoid bone, vertebral column, the thoracic cage, and the sternum.

    Here are some new interesting facts I learned today. The five major parts of a bone is the: 
Epiphysis- Expanded ends of a bone
Diaphysis- Shaft of a bone
Articular cartilage- Covers the ends of bones
Periosteum- Tough membrane covering over the ends of bones
Medullary cavity- Connects to spaces in the spongy bone
These are the five major parts of a bone. 

     Another thing I learned in class is the membrane that is lining the medullary cavity is called the Endosteum. Also, the proper term for a skeletal joint is Articulation. The two types of marrow is the Red marrow, which is mainly in the spongy bone in adults and it produces blood cells, and the second marrow is Yellow marrow which is the fat storage and it replaces much of the red marrow in diaphysis childhood. Now, the proper names for the two types of bone tissue is the Compact bone tissue, which is the wall of the diaphysis and the Spongy bone tissue, which is in the Epiphysis.

      The bones that are considered intramembranous is the broad, flat bones of the skull. The Endochondral bones are all other bones that are intramembranous.

Bones grow in thickness by the activity of osteoblasts. Osteoblasts are the cartilage cells that form cells.

The last fact I had learned in class is the three major types of joints which is:
Synarthrotic- an immovable joint meaning it can not move
Amphiarthrotic- slightly movable joint
Diarthrotic- freely moveable joint

These are all of the facts I have learned in class.

Resources: http://www.biologycorner.com/anatomy/skeletal/notes_ch7.html
Science teacher
My study guide