Synchondrosis
Encyclopedia
Where the connecting medium is hyaline cartilage
, a cartilaginous joint
is termed a synchondrosis. An example of a synchondrosis joint is the first sternocostal joint (where the first rib
meets the sternum). In this example, the rib articulates with the sternum via the costal cartilage. (The rest of the sternocostal joints are synovial plane joints.)
Sometimes, this is a temporary form of joint called epiphyseal growth plate
, where the cartilage is converted into bone
before adult life.
Such joints are found between the epiphyses and diaphyses of long bone
s, between the occipital
and the sphenoid
, and for some years after birth, between the petrous portion of the temporal and the jugular process of the occipital bone.
Hyaline cartilage
Hyaline cartilage consists of a slimy mass, pearly bluish in colour with firm consistency and considerable collagen. It contains no nerves or blood vessels, and its structure is relatively simple....
, a cartilaginous joint
Cartilaginous joint
Cartilaginous joints are connected entirely by cartilage . Cartilaginous joints allow more movement between bones than a fibrous joint but less than the highly mobile synovial joint. An example would be the joint between the manubrium and the sternum...
is termed a synchondrosis. An example of a synchondrosis joint is the first sternocostal joint (where the first rib
First rib
The first rib is the most curved and usually the shortest of all the ribs; it is broad and flat, its surfaces looking upward and downward, and its borders inward and outward....
meets the sternum). In this example, the rib articulates with the sternum via the costal cartilage. (The rest of the sternocostal joints are synovial plane joints.)
Sometimes, this is a temporary form of joint called epiphyseal growth plate
Epiphyseal plate
The epiphyseal plate is a hyaline cartilage plate in the metaphysis at each end of a long bone...
, where the cartilage is converted into bone
Bone
Bones are rigid organs that constitute part of the endoskeleton of vertebrates. They support, and protect the various organs of the body, produce red and white blood cells and store minerals. Bone tissue is a type of dense connective tissue...
before adult life.
Such joints are found between the epiphyses and diaphyses of long bone
Long bone
The long bones are those that are longer than they are wide. They are one of five types of bones: long, short, flat, irregular and sesamoid. Long bones, especially the femur and tibia, are subjected to most of the load during daily activities and they are crucial for skeletal mobility. They grow...
s, between the occipital
Occipital bone
The occipital bone, a saucer-shaped membrane bone situated at the back and lower part of the cranium, is trapezoidal in shape and curved on itself...
and the sphenoid
Sphenoid bone
The sphenoid bone is an unpaired bone situated at the base of the skull in front of the temporal bone and basilar part of the occipital bone.The sphenoid bone is one of the seven bones that articulate to form the orbit...
, and for some years after birth, between the petrous portion of the temporal and the jugular process of the occipital bone.