Arthrology- Joints

Question 1

3 Types of Joints

Answer 1

1. synovial: freely moveable
2. fibrous: fixed, slightly moveable
3. cartilaginous: slightly moveable, primary and secondary cartilaginous joints

Question 2

Types of Synovial Joints

Answer 2

1. Pivot: vertebrate spinning on other vertebrate, rotation, ex: C1 and C2
2. Plane: 2 flat edges, slide and glide, ex: ac joint and infacet joint
3. Hinge: motion in one direction, ex: elbow
4. Saddle/sellar: motion in 2 directions, can do circumduction but not rotation, ex: thumb
5. Condyloid/ ellipsoid: flex/ext abd/add circum, ex: each digit
6. Ball and Socket/ Spheroidal: most motion, ex: shoulder, femoral head
7. Bicondylar: ex- tibia and femur

Question 3

Fibrous Joints

Answer 3

• unite bones via fibrous tissue
• Slightly Moveable
  - syndesmosis: interosseous membrane between
  radius and ulna
  - gomphoses: teeth in gums
  -Fixed/ Synarthrosis
  - sutures (skul)
  - schindylesis (wedge and groove joint), face bones

Question 4

Cartilaginous

Answer 4

• Primary Cartilaginous joint/ synchondrosis: bones united by hyaline cartilage, usually temporary, ex: epiphyseal plate
• Secondary Cartilaginous joint/ symphyses: bones united by fibrocartilage, ex: invertebral discs, pubic symphysis