October 11 - October 11, 2006 INTRODUCTION TO BONES,...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
October 11, 2006 INTRODUCTION TO BONES, JOINTS, AND MUSCLES I. Bone A. Introduction 1. Bone is a dense connective tissue, unique in that extracellular components are calcified, imparting its characteristic hardness and strength. 2. Composition - 35% organic (mainly collagen), and 65% inorganic (mainly calcium phosphate). Combination provides both tensile and compressive strength. 3. Bones are complex living organs, consisting of bone tissue, periosteum and endosteum, blood and lymph vessels, nerves. B. Functions of bone 1. Support of soft tissues, resistance to gravity. – i.e. cranial cavity 2. Muscle attachment , providing mechanical basis for movement 3. Protection of internal organs – i.e. ribcage 4. Production of red blood cells (in marrow) 5. Mineral reservoir – Calcium exchange, crucial for maintaining balance. C. Classification of bones – 3 ways to do it 1. Basic structure: cancellous ( trabecular , porous, spongy) vs. cortical (denser bone) 2. Regional a. Axial (skull, vertebral column, ribs, sternum) b. Appendicular (limbs and limb girdles) 3. Shape and structure a. long (most limb bones: i.e. femur) b. short (wrist/carpals and ankle/tarsals) c. flat (cranial vault, ribs, sternum, scapula) d. irregular (much of skull, vertebrae, pelvis) e. sesamoid (bones found in tendons: patellae/kneecap, others)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/22/2008 for the course BIOLOGY 020.152 taught by Professor Pearlman during the Spring '08 term at Johns Hopkins.

Page1 / 2

October 11 - October 11, 2006 INTRODUCTION TO BONES,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online