The Skeletal System
By: Shaan Sandhu
The skeletal system provides support for organs, absorbs mineral, helps with bone marrow, and protects organs. The skeletal system is VERY IMPORTANT.
Periosteum: The tough layer of outer connected tissue of the bone.
Haversian Canals: Provides sites for blood vessels to move through.
Bone Marrow: Bone marrrow is soft tissue that produces blood cells. B cells from the lymphatic/immune system also mature here. There are two types of bone marrow, red and yellow marrow.
Red Marrow: Red marrow produces blood cells, specifically red blood cells.
Yellow Marrow: Yellow marrow is mainly consisted of fat cells.
Fun Fact: People enjoy eating yellow marrow, but people do not generally eat red marrow.
Cartilage: Flexible connective tissue. The skeleton of an embyro consists of cartilage, but through ossification, or the process of bone formation, minerals are added around bone cells.
Ligaments: Ligaments are held together in joints and is attached to the periosteum.
JOINTS
Saddle Joint: Saddle joints are very flexible and allow a lot of free movement. An example is the hand and fingers, which have a lot of free movement.
Hinge Joint: Hinge joints are flexible, but more limited in movement than saddle joints or ball and socket joints. And example of this joint would be the elbow and knee joints. These joints can move in one direction but cannot move in the other direction.
Pivot Joint: Pivot joints are joints that include the skull and the neck.
Ball and Socket Joint: Ball and Socket Joints are joints that have two bones attatched together in the fashion of a ball connecting to a hollow cavity. An example of this joint would be the shoulder/humerus.
Immovable Joints: There are also immovable joints in the body, such as in the skull.
Here is a Crash Course video explaining the skeletal system. Have fun listening to Hank!
BONES!
Here is a diagram of the skeletal system showing many of the basic bones.
Disorders of the Skeletal System:
jOsteoporosis: Osteoporosis is a medical condition in which someone's bones can turn weak and brittle, turning these bones fragile, due to a loss of tissue. How can you get osteoporosis? Osteoporosis can be caused by a lack of Vitamin D, calcium, or hormonal changes.
Osteoarthritis: A type of arthritis(the most common type of arthritis) that occurs when tissue at the ends of bone wear down. This can cause a lot of pain in the joints.
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Want a more detailed image of the skeletal system? This website provides everything you need.
