![]() ![]() Our bones can be joined together by rubbery cartilage or flexibly linked by muscles or ligaments.Ī baby’s skeleton typically consists of more individual bones. the bones in the left arm are mirror images of the bones in the right arm. Many bones come in pairs that are almost identical in size and shape - i.e. Our bones are constantly being rebuilt (or remodeled) on a day to day basis to maintain optimal function. These cells are constantly working to keep your bones healthy and strong. Finally, many bones have an inner core that houses a jelly like substance called marrow.īones have special cells called osteoblasts that make new bone and osteoclasts that break up the old bone. Within the hard outer shell, exists an area made up of spongy bone, known as cancellous bone. At the microscopic level, this hard outer shell is made up of rod like structures called osteons. Most bones (particularly the long bones of the arms and legs - which make up the appendicular skeleton) have a hard outer shell known as cortical bone. Hydroxyapatatite, which consists mainly of calcium and phosphate, gives bone its hardness. ![]() Structurally, bones are somewhat elastic because they are primarily made up of collagen. Muscles cannot push against the bone, so muscles typically come in pairs (known as antagonists), one muscle pulls the bone one way and the antagonistic muscle pulls the bone back the other way. Bones do not move on their own muscles move our bones by pulling on them. The bones of the skeleton give our body its shape, protect and support our organs, brain and spinal cord, and make it possible for us to move. Our skeleton consists of a strong and solid internal framework of bones within our body. The Skeleton Click to see Larger Image of Skeletal System They act to protect ligaments and tendons from rubbing against bare bones. Bursae are small fluid-filled sacs that typically exist at high friction points near joints. Ligaments are strong ligamentous structures that typically anchor bones to one another. Our skeletal system is made up of over 200 individual bones. The muscles are attached to the bones via rope-like structures called tendons. We are able to control our muscles by sending stimulating impulses via nerves from our brain. It consists of a large number of tendons, ligaments, bones, cartilage, joints, and bursae. In the shoulder, it is common to develop rotator cuff tendinitis, which is a swelling of the tendons that support the rotator cuff.The anatomy of our musculoskeletal system is quite complex. Osteoarthritis is a common problem seen in the hip joints that occurs as the lubricating cartilage of the joint degenerates. ![]() Common ball and socket joints include the hips and shoulders. Since the rounded head can move freely within the cup, or socket, this allows for movement in all directions. There are six different types of synovial joints, including: Ball and Socket Jointsīall and socket joints are composed of one bone with a rounded head that fits into the cup of another bone. For this reason, we will be looking closely at the different types of synovial joints, where they are found in the body, and what problems or injuries commonly affect them. When it comes to joint problems and injuries, synovial joints are affected far more than fixed or cartilaginous joints. Synovial joints are the most common joint in the body and are the type of joint that most people are familiar with.
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