Lecture 6. Joints Flashcards
What are the 2 ways that joints can be classified?
- functional (think of mobility)
2. anatomical
What are the categories according to the functional classification
- synarthrosis: very little movement
- amphiarthrosis: semi-movable
- diarthrosis : most mobile ( eg. shoulder joints)
What is an example of a synarthrosis joint
joints of the bones of the skull ( except mandible)
What are the classifications under anatomical categorization of joints
- solid joints ( bones are joined together either by fibrous tissue or cartilage) * depends on what type of tissue holding the bones together
- fibrous joint (by dense connective tissue)
- cartilaginous joint - synovial joint (bones have a gap between each other)
- monoaxial- bones move in only 1 plane
- biaxial- bones move in only 2 plane (eg. wrist, knee )
- multi-axial- bones move in only 3 plane
- non-axial- gliding movement
What is unique about solid joints?
There are no spaces between the bones( the CT/cartilage ). bones touch each other
Describe synovial joints
There is a gap between the bones, presence of a cavity. bones may touch but are not attached
What are the sub-categories of solid joints.
- fibrous joint
2. cartilaginous joint
Give 3 examples of fibrous tissues
- suture: joints formed between bones of the skull with the sutures ( coronoid and lambdiod sutures): dense CT tissue hold bones together
- syndesmosis: dense CT forms ligament to hold joints together ( eh. fibula and tibia)
- gomphosis: name of the joint between the upper and lower jaw bones (periodontal cavity)
How are cartilaginous joints that are present? Give examples
- synchrondroses: bones are attached by hyaline cartilage only
- symphyses: bones attached only by fibrous cartilage
Which cartilage can be used in cartilaginous joints?
hyaline and fibrous cartilage only, elastic cartilage cannot be used
Give 2 examples of synchondroses joints
- epiphyseal plate
2. joint between the first rib and the sternum
Give 2 examples of symphyses joints
- between the vertebrae body
2. pubic symphyses ( joint between the pubic bone)
Where are symphses joints typically found
midline of the body only
Describe the features of the synovial joints
- have articular cartilage ( which is made up of hyaline cartilage)
- capsule made up of dense irregular connective tissue that holds the bone together : fibrous capsule. fibrous capsule is continuous with the periosteom
- (*optional) ligament: dense connective tissue that stabilize the joints
- synovial membrane: specialized CT. It is a serous membrane. It produces synovial fluid to articulate the surfaces and nourishes the hyaline cartilage
What is the function of the articular cartilage
reduce friction between the bones
What part of the synovial joint is continuous with the periosteum
fibrous capsule
What is the function of the synovial membrane
- produces synovial fluid
- nourishes the hyaline cartilage
What composes the articular capsule
- fibrous capsule
2. synovial membrane