Joints

Question 1

How are joints classified (by what 2 aspects)?

Answer 1

1. By FUNCTION (degree of mobility/possible amt of movement)
2. By STRUCTURE (how the bones are connected)

Question 2

Functional Joint Classification (3 types)
1. Which are immovable?
2. Which are slightly movable?
3. Which are freely movable?

Answer 2

1. Synarthroses
2. Amphiarthroses
3. Diarthroses

Question 3

Structural Classification of Joints (List the 3 main categories and their sub categories (2 have subcats)

Answer 3

1. Fibrous Joints -
   no joint cavity present: (Sutures, Syndesmoses, Gomphoses)
2. Cartilaginous Joints -
   no joint cavity present; articulating bones united by hyaline cartilage
   (Synchondroses, Symphyses)
3. Synovial Joints -
   (diarthrotic joints) - fluid filled joint cavity allows for freedom of movement

Question 4

FIBROUS Joints.
(List sub type for ea.)

1. Short CT tissue fibers that penetrate into articulating bones;
   e.g.- bones of skull
2. Bones connected by ligament or interosseous membrane;
   e.g. interosseous membrane of radius & ulna, tibiofibular joint
3. Articulation of tooth with bony alveolar socket;
   e.g.- periodontal ligament

Answer 4

1. Suture; (synarthroses); Class: Structural
2. Syndesmoses: (amphiarthroses): Class: Structural
3. Gomphoses; (synarthroses); Class: Structural

Question 5

CARTILAGENOUS Joints.
(List sub type, function type; and class type for ea.)

1. Made by hyaline cartilage; eventually may calcify;
   e.g.- epiphyseal growth plates, sternal costal joint
2. made of fibrocartilage that provides disk elasticity & compressibility.
   e.g.- pubic symphysis, intervertebral joints

Answer 5

1. Synchondrosis; (synarthrotic); Class: Structural
2. Symphyses; (amphiarthritic); Class: Structural

Question 6

1. Fluid Filled joint Cavity allows freedom of movement;
   e.g.- knee joint

Answer 6

1. Synovial Joint (diarthrotic),
   Class: Structural