SECTION UNIT QUIZ: critical Thinking and Application Questions Poateriorwould 1
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SECTION UNIT QUIZ: critical Thinking and Application Questions Poateriorwould 1 Would sbrous and cartilaginous joints be able to perform their functionsi hey bad pinet aitin Ein 9 2 Your father plans to visit an alternative medicine practitioner for "cranial therapy." You read the brochure for this proposed treatment and note that it involves the movement and manipulation of the cranial sutures, which the practitioner claims will cure nearly all diseases. What kind of joint is a cranial suture, Given these facts, what do you think of the claims made about "cranial therapy?" both structurally and functionally? The cause for this excess range of motion isn't the presence of a second joint but, instead, weakness of the ligaments surrounding the joint. Why would weakness of these ligaments lead to a greater range of motion at that joint 3 The term double-jointed describes individuals who have an abnormally large range of motion in a given joint.Explanation / Answer
1) No, fibrous and cartilaginous joints don’t have joint cavities. The reason behind this is the fact that these joints don’t move or are fixed joints. On the other hand only the synovial joints have a cavity. The synovial fluid within the cavity helps in movement.
Fibrous Joints
The bones of fibrous joints are held together by fibrous connective tissue. There is no cavity, or space, present between the bones, so most fibrous joints do not move at all. There are three types of fibrous joints: sutures, syndesmoses, and gomphoses. Sutures are found only in the skull and possess short fibers of connective tissue that hold the skull bones tightly in place.
Cartilaginous Joints
Cartilaginous joints are those in which the bones are connected by cartilage. There are two types of cartilaginous joints: synchondroses and symphyses. In a synchondrosis, the bones are joined by hyaline cartilage. Synchondroses are found in the epiphyseal plates of growing bones in children. In symphyses, hyaline cartilage covers the end of the bone, but the connection between bones occurs through fibrocartilage. Symphyses are found at the joints between vertebrae and between the pubic bones. Amphiarthroses allow only slight movement; therefore, either type of cartilaginous joint is an amphiarthrosis.
2) A suture is a type of fibrous joint that is only found in the skull. The bones are bound together by Sharpe’s fibers. A tiny amount of movement is permitted at sutures, which contributes to the compliance and elasticity of the skull. These joints are synarthroses
Thus, based on their movement ability, some fibrous and cartilaginous joints are functionally classified as synarthroses while others are amphiarthroses. The most common type of joint is the diarthrosis, which is a freely moveable joint. All synovial joints are functionally classified as diarthroses.
Low loads of force, similar to those used clinically when performing a cranio sacral frontal lift technique, resulted in no significant changes in coronal suture movement or ICP in rabbits. These results suggest that a different biological basis for craniosacral therapy should be explored.
Manipulation of the zygoma, another important issue with cranial bone motion is its context within the treatment paradigm of craniosacral therapy. They reported movement between these bones along suture lines.
3) People who are "double-jointed" have joints that are Weakly stabilized; their joints permit a greater range of motion than do those of other individuals; more likely to suffer partial or complete dislocations.
There is a defect in the collagen tissue which allows for greater range of motion. If the collagen was not defective, it would be more elastic and not allow a greater range of movement.
What makes a person seem double-jointed can actually have more to do with the soft tissue that's near the joints than the actual joints themselves. Most joints are wrapped in ligaments, which connect bone to bone, and tendons, which connect muscle to bone. Everyone's joints have the same range of motion, but the flexibility of a person's ligaments and tendons determines a person's ability to, say, flex at the hips in order to touch their toes.
Most people have hyper mobility with no other symptoms. Approximately 5% of the healthy population have one or more hyper mobile joints. However, people with "joint hyper mobility syndrome" are subject to many difficulties. For example, their joints may be easily injured, be more prone to complete dislocation due to the weakly stabilised joint and they may develop problems from muscle fatigue (as muscles must work harder to compensate for weakness in the ligaments that support the joints). Hyper mobility syndrome can lead to chronic pain or even disability in severe cases.
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