Flashcards in Chapter 9 - Joints Deck (190)
How do joints contribute to homeostasis?
Holding the bone together in ways that allow for movement and flexibility
What is a joint?
A point of contact between two bones, bone and cartilage or between bone and teeth
What does it mean if a bone articulates with another bone?
That those bones form a joint
What is the study of joints called?
What is the study of motion of the human body called?
How are joints classified?
Structurally (based on their anatomical characteristics) and
Functionally (based in the type of movement they permit)
What two criteria is the structural classification of joints based on?
1. The presence or absence of a space between the articulating bones
2. The type of connective tissue that binds the bones together
What are the three types of joints (based on structural classification)?
1. Fibrous joints
2. Cartilaginous joints
3. Synovial joints
What are fibrous joints?
There is no synovial cavity
Bones are held together by dense irregular connective tissue that is rich in collagen fibres
Permit little or no movement
What are cartilaginous joints?
There is no synovial cavity
Bones are held together by cartilage
What are synovial joints?
The bones forming the joint have a synovial cavity
Bones are joined by dense irregular connective tissue of an articular capsule
What is a synovial cavity?
A space between the articulating bones
What is an articular capsule?
An envelope surrounding a synovial joint
What are the three types of joints (based on functional classification)?
What is a synarthrosis joint?
An immovable joint
What is an amphiarthrosis joint?
A slightly moveable joint
What is a diarthrosis joint?
A freely moveable joint
If a joint is a diarthrosis joint, it is always a ___________ kind of joint.
What are the three kinds of fibrous joints?
1. Sutures (synarthrosis)
2. Syndesmoses (amphiarthrosis)
3. Interosseous membranes (amphiarthrosis)
What is a suture?
Fibrous joint, based on structural classification, synarthrosis
Occur only between bones of the skull
What is synostosis?
A joint in which there is a complete fusion of separate bones into one
Classified as a synarthrosis - b/c it is immoveable
What is a syndesmoses?
A fibrous joint, amphiarthrosis
Greater distance between the articulating surfaces
Dense irregular connective tissue between the bones that allow the joint to permit limited movement
A syndesmoses joint could also be classified as a _________ joint. Why?
B/c the joint allows limited movement
What is gomphosis?
Cone shaped peg fits into a socket
Example of a syndesmoses joint
What is interosseous membrane?
Fibrous joint, amphiarthrosis
Substantial sheet of dense irregular connective tissue that binds neighbouring long bones and permits slight movement
Where do you find interosseous membranes?
Between the tibia and fibula
Between the ulna and radius
What are the two kinds of cartilaginous joints?
What is a synchondrosis joint?
Cartilaginous joint, synarthrosis
Connecting material is hyaline cartilage
Example - epiphyseal (growth) plate in a growing bone
What is a symphysis joint?
Cartilaginous joint, amphiarthrosis
Ends of the articulating bones are covered with hyaline cartilage but a broad, flat disc of fibrocartilage connects the bones
Slightly movable joint
Example : pubic symphysis