PEDS-100 Lecture Notes - Lecture 4: Intramembranous Ossification, Cranial Cavity, Osteocyte

• School: MacEwan University
• Department: Physical Education
• Course: PEDS-100
• Professor: David Kato

Document Summary

Support (framework for our skin and muscles to hold on to. Widely separated large amount of matrix (extra solular substance that it thrives on) Stem cells from the mesenchyme (haven"t difereniated yet) Classiied as compact (corical) or spongy (cancellous) Basic unit is the osteon or haversian system: Small spaces containing osteocytes (mature bone)- osteocyte sits inside the lacunae. Minute canals for transport of nutrients and waste (allows nutrients to pass through t provide nutrients to the ostecyte) A central (haversian) canal for blood vessels and nerves. Osteons contain: (impact or stress causes them to remodel themselves to force. Osteons are aligned in the paths of stress*** Trabecular bones gives the strength but takes away lots of the access weight makes it lighter. Forms most of the lat and irregular bones. Light and protects red bone marrow (provides red blood cells or erythrocytes) Remodeling - ongoing replacement of bone (can takes years to replace)