The Skeletal System

Axial Skeleton Appendicular Skeleton

Axial Skeleton

Axial Skeleton Hyoid Bone

Axial Skeleton

Appendicular Skeleton

Bone Tissue Osteoblasts – bone forming cells Osteocytes – The BONE CELLS Osteoclasts – bone reabsorbing cells

Two Types of Bone Tissue Compact Bone and Spongy Bone

Classification of Bones Long Bones Short Bones Flat Bones Irregular Bones Proximal Epiphysis Diaphysis Distal Epiphysis

Features of Bone Projections that form joints Features of Bone Projections that form joints Projections that are sites of muscle & ligament attachment Features of Bone Projections that form joints Projections that are sites of muscle & ligament attachment Openings that allow blood vessels and nerves to pass Features of Bone Projections that form joints Projections that are sites of muscle & ligament attachment Openings that allow blood vessels and nerves to pass Depressions

Structure of Bone

Bone Development & Growth Two Categories of Bone Development 1.Intramembranous (Direct) – forms spongy bone and eventually may form compact bone from embryonic fibrous membrane 2.Endochondral - bone forms from cartilage; forms skull & flatbones Before week 8 of fetal life, the human skeleton is all fibrous membrane & hyaline cartilage

Bone Development & Growth

Epiphyseal Plate – Growth Plate

Joints or Articulation

Joints – Three Types Fixed Joint Cartilaginous Joint Synovial Joint

Synovial Joints

Broken Bone Repairs

Michael Paulus' Cartoon Skeletons