1. Daily Quiz Where is the femur found? What is another name for the mandible? Where is the humerus found? Describe a comminuted bone fracture. What is the first step in healing a bone fracture?

2. Joints

3. also known as articulations where bones come together

4. Functions of Joints bind parts of skeletal system allow for bone growth permit parts of the skeleton to change shape during childbirth allow body to move when muscles contract

5. Joints are classified by: amount of movement allowed Synarthrotic (immovable) Diarthrotic (freely movable) Amphiarthrotic (slightly movable)

6. Joints grouped by tissue type Fibrous joints thin layer of dense connective tissue between two close bones synarthrotic ex: suture between two bones in the skull

7. Joints grouped by tissue type Cartilaginous cartilage connects two bones amphiarthrotic, absorbs shock Ex: between two vertebrae

8. Joints grouped by tissue type Synovial Joints diarthrotic most common ends of bones are covered in cartilage with a fluid-filled capsule surrounding them

9. Types of synovial joints ball-and-socket joint ball shaped head of one bone articulates with cup-shaped cavity of another movement in all planes and rotation allowed Ex: shoulder and hip

10. Types of Synovial Joints Ellipsoidal joint oval-shaped part of one bone articulates with elliptical cavity of another Movement: variety of movement in different planes, no rotation Ex: joints between metacarpals and phalanges

11. Types of Synovial Joints Gliding/Plane articulating surfaces are nearly flat Movement: sliding or twisting Ex: wrist and ankle

12. Types of Synovial Joints Hinge joint convex surface of one bone articulates with concave surface with another Movement: flexion and extension Ex: Elbow

13. Types of Synovial Joints Pivot Joint cylindrical surface of one bone articulates with ring of bone and ligament Movement: rotation around central axis Ex: base of skull to the spine

14. Types of Synovial Joints Saddle Joint articulating surfaces have both concave and convex regions, fit complementary Movement: usually in two planes Ex: joint between carpal and metacarpal of thumb