Fibrous Joints Flashcards
What are the three fibrous joints?
Sutures
Syndesmoses
Gomphoses
What are three characteristics of sutures?
-bound by sutural ligament (a thin layer of dense fibrous CT)
-only between bones of the skull
-fibrous tissue ossifies and the bones fuse during middle age (synostosis)
What is a special function of sutures?
allows the skull to expand as the brain grows during development
What is synostosis?
-bony junctions
-sutures where CT is replaced by bone
What shape are the sutures between skull bones?
edges of joining bones are wavy and interlocking
What is the functional classification of sutures?
Synarthrosis
What are four characteristics of syndesmoses?
-distance between the 2 bones is greater than in a suture
-bones are connected exclusively by ligaments
-CT is present as a bundle (ligament) or sheet (interosseous membrane)
-amount of movement depends of length of connecting fibres
Do long fibres or short fibres allow for large amounts of movement in syndesmoses joints?
long fibres
e. g. interosseous membrane between radius and ulna
What’s an example of a syndesmoses joint with short fibres?
distal tibiofibular articulation (front of ankle area)
How are syndesmoses joint functionally classified?
amphiarthrosis
How would you describe a gomphoses joint?
-peg in socket joints
What is the only example of a gomphoses joint?
Dentoalveolar joint (articulation of tooth with socket)
What do periodental ligaments do?
hold teeth in sockets
What is the functional classification of gomphoses joints?
Synarthrosis
