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Joint articulation
is the point of contact between two bones, between bone and cartilage or between bone and teeth.
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Fibrous Joints
there is no synovial cavity in this joint and it is held together by dense irregular connective tissue
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cartilaginous joints
There is no synovial cavity in this joint and it is held together by cartilage
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synovial joints
there is a synovial cavity in this joint and the bones are united by dense irregular connective tissue of an articular capsule and by ligaments
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Synarthrosis
an immovable joint
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amphiarthrosis
a slightly moveable joint
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Diarthrosis
a freely movable joint. They are all synovial joints
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Fibrous joints : Suture
is a fibrous joint composed of a thin layer of dense irregular connective tissue. It is functionally synarthrosis
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Fibrous joints: Syndesmoses
is a fibrous joint in which there is a greater distance between the articulating surfaces and more dense irregular connective tissue. Functionally classified as ampiarthrosis
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Fibrous joints: interosseus membranes
a substantial sheet of dense irregular connective tissue that binds neighbouring long bones and permits slight movements (amphiarthrosis)
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Synchondrosis
is a cartilaginous joint in which the connective tissue is hyaline cartilage. ex ephyseal growth plate. Functionally it is a synarthrosis.
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Joint classification
-based on the presence or absence of a space between articulating bones
- the type of connective tissue that binds them together
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Symphysis
is a cartiliginous joint in which the ends of the articulating bones are covered with hyaline cartilage, but a broad flat disc of fibrocartilage connects the bones. They all occur at the midline of a bone. functionally amphiarthrosis
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Synovial joints
- all have synovial cavities
- all are diarthroses
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articular capsule
surrounds a synovial joint. It encloses the synovial cavity, and unites the articulating bones. It is composed of two layers an outer fibrous membrane and an inner synovial membrane
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fiberous capsule
has dense irregular connective tissue that attaches the periosteum of the articulating bones. Because it is flexible it permits considerable movement, while its strength helps prevent the bones from dislocating
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ligaments
fiber bundles that hold bones close together during movement
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synovial membrane
the inner layer of the articular capsule is composed of areolar connective tissue with elastic fibers
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synovial fluid
it is a viscous, clear, pale yellow. It forms a thin film over the surfaces in the articular capsule. It reduces friction, absorbs shocks and supplying oxygen and nutrients to and removing carbon dioxide and metabolic wastes from the chondrocytes within articular cartilage
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accessory ligaments
one lies outside the articular capsule and the other within
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articular discs
- pads of fibrocartilage found between the articular surfaces of the bones and are attached to the fibrous capsule.
- they allow the bones of different shapes to fit together.
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nerve and blood supply
synovial joints contain an extensive nerve and blood supply which carry information about joint stretch and pain.
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Bursae
saclike structures, similar in structure to joint capsules, that alleviate friction in the joints such as the shoulder and knee joints.
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Tendon sheaths
are tubelike bursae that wrap around tendons where there is considerable friction.
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