Chp9- joints Flashcards
Where does body movement occur?
• at joints
What is another name for joints?
• articulations
What connects at a joint/ articulation?
• two bones
What determines the direction and distance of movement?
• joint structure
What does ROM stand for?
• range of motion
What happens to the joint as mobility increases?
• joint strength decreases
What are the 2 types of joint classification?
- Functional classification
2. Structural classification
What is functional classification based on?
• the ROM
What is structural classification based on?
• the anatomical organization of the joint
What are the 3 types of functional classification?
- Synarthrosis
- Amphiarthrosis
- Diarthrosis
What type of functional joint is synarthrosis?
• immovable joint
What type of functional joint is amphiarthrosis?
• slightly movable joint
What are the 4 types of structural classification?
- Bony
- Fibrous
- Cartilaginous
- Synovial
Which joints are immovable?
• synarthroses joint
What can happen at the edges of bone in synarthrosis?
• edges of bone may touch or interlock
How many types of synarthrosis joints is there?
• 4
What are the 4 types of synarthrosis joints?
- Suture
- Gomphosis
- Synchondrosis
- Synostosis
Where can you find suture joints?
• only between the bones of the skull
How are suture joints connected?
• by dense fibrous CT
Where can you find gomphosis joints?
- in the maxillae and mandible
* binding the teeth to body sockets
How does gomphosis joints attach?
• by periodontal fibrous
Where can you find synchondrosis joints?
- the cartilage between two articulating bones
* epiphyseal cartilage
What is an example of synchondrosis joints?
•vertebrosternal ribs and manubrium/sternum
What type of functional joint is diarthrosis?
• freely movable joint
Where can you find synostosis joints?
• between two fused bones
What type of functional joint is more movable than synarthrosis, but stronger than freely movable joints?
• amphiarthroses
How many types of amphiarthrosis is there?
• 2
What are the 2 types of amphiarthrosis ?
- Syndesmosis
2. Symphysis
Where can you find syndesmosis joints?
- at bones connected by ligaments
* at distal articulations between tibia and fibula
Where can you find symphysis joints?
- at bones separated by Fibrocartilage
* at articulations between pubic bones
What kind of joints are diarthroses joints?
• movable joints
What is another name for diarthrosis joints?
• synovial joints
Where can you find diarthrosis/ synovial joints?
- end of long bones
* within articular/joint capsules
What surrounds the articular capsule in a synovial joint?
- envelope of membrane
* lined with synovial fluid
What are the 4 component of synovial joints?
- Joint capsule
- Synovial membrane
- Articular cartilage
- Joint cavity containing synovial fluid
What prevents bones from touching?
• pad articulating surfaces
Articular cartilage
What reduces friction?
• synovial fluid
What does synovial fluid contain?
• slippery proteoglycans
What secretes proteoglycans?
• fibroblast
What are the 3 functions of synovial fluid?
- Lubrication
- Nutrient distribution
- Shock absorption
What are the accessory structures of a synovial joint?
- Cartilages
- Fat pads
- Ligaments
- Tendons
- Bursae
What does cartilage do?
• cushion the joint
What is the Fibrocartilage pad called?
• meniscus
What does fat pads do?
• protect articular cartilage
Where are fat pads located?
• superficial to the joint capsule
What does tendon do?
- attach to muscle around joint
* help support joint
What is a bursa?
- pouch
* pocket of synovial fluid
What does the bursa do?
• cushions areas where tendons or ligaments rub
How do you prevent injury in synovial joints?
• by limiting range in motion