Functional classification of joints chapter 9 A & P
What is functional classification of joints based on?
the amount of movement allowed by the joint
biaxial joint
type of diarthrosis; a joint that allows for movements within two planes (two axes)
uniaxial joint
type of diarthrosis; joint that allows for motion within only one plane (one axis)
What are synovial joints classified as ?
Diarthrosis
What functional joint is freely mobile ?
Diarthrosis
What is a gomphosis joint also known as?
Peg-and-socket joint
A syndesmosis does not prevent all movement between bones and thus this type of fibrous joint is functionally classified as what?
Amphiarthrosis
The cartilaginous joint called symphysis is functionally classified as :
Amphiarthrosis
What functional joint has limited mobility ?
Amphiarthrosis
In newborns and infants the areas of connective tissue between the bones are much wider; what are these broad areas of connective tissue called?
Frontalles
In a syndesmosis joint If the gap between the bones is wide what connective tissue will fill in?
Interosseous membrane
In a syndesmosis joint if the gap between bones is narrow what are the bones joined by?
Ligaments
What are synarthrosis joints good for ?
Strong union between articulating bones;providing protection for internal organs
What are the 4 types of synarthrosis ?
Suture; joint between bones of skull Gomphosis ; only between bones of skull/teeth Synchondrosis ; rigid bridge like true ribs to the sternum Synostosis ; two bones fuse like center of frontal bone, no suture line
Due to the immobility of a gomphosis this type of joint is functionally classified as what?
Synarthrosis
Due to the lack of movement between the bone and cartilage both temporary and permanent synchondroses are functionally classified as :
Synarthrosis
What are skull sutures functionally classified as?
Synarthrosis
What is an immobile or nearly immobile joint called ?
Synarthrosis
What 3 functional classifications of joints are there ?
Synarthrosis (immobile) Amphiarthrosis (slightly moveable ) Diarthrosis (freely moveable)
What are cartilaginous joints functionally classified as ?
Synarthrosis or amphiarthrosis
What are fibrous joints functionally classified as ?
Synarthrosis or amphiarthrosis
At some sutures the connective tissue will ossify causing the adjacent bones to fuse together; what is this called?
Synostosis
Multiaxial (triaxial or polyaxial) joint
Type of diarthrosis; joint that allows for movements within 3 or more planes
What 3 categories are diarthrosis divided into ?
Uniaxial, biaxial, and , multiaxial
