Class Notes (836,518)
Canada (509,851)
ANAT 101 (99)
Lecture

Lecture #6 - Bone Tissue.doc

5 Pages
90 Views
Unlock Document

Department
Anatomy and Cell Biology
Course
ANAT 101
Professor
Richard Oko
Semester
Winter

Description
Lecture #6 - Bone Tissue Skeletal System 5 functions 1) Support -for entire body -bones provide attachments for soft tissues and organs 2) Storage -reserves in bones for calcium salts for body fluids -bones store lipids as energy reserves in areas filled with yellow marrow 3) Blood cell production -occurs in red marrow -results in increases in red and white blood cells, and platelets (blood clot format.) 4) Protection -protect soft tissues and organs -ex. ribs protect heart and lungs, skull encloses brain 5) Movement -function as levers -muscles pull on bones -> movement occurs Bones (206) bones (osseous tissue): supporting connective tissue -contains matrix(collagen, calcium) made of extracellular protein fibers and a ground substance -calcium phosphate/Ca (PO ) accounts for 2/3 of bone weight (deposited in matrix) 3 4 2 General Shapes of Bones 1) Long Bones -ex. humerus 2) Short Bones -ex. carpals 3) Flat Bones -ex. scapula 4) Irregular Bones -ex. vertebra LONG BONE • diaphysis (central shaft) -has marrow cavity filled with bone marrow • epiphyses (wider portions at each end) Lecture #6 - Bone Tissue -covered with articular cartilage • 2 types of bone tissue 1) compact bone -densely packed, forms diaphysis 2) spongy bone/cancellous bone -has projections of bone separated by space • periosteum -outer surface of bone • endosteum -layer lining the inside of bone -covers spongy bone (of marrow cavity) and other inner surfaces Histology of Bone • periosteum has 2 layers -fibrous outer layer -cellular inner layer • osteocytes: bone cells -located in lacunae (small pockets formed between lamellae, narrow sheets of matrix) • canaliculi: small channels that run through the matrix -connect lacunae and blood vessels (how osteocytes get their nutrients!) Compact Bone osteon: basic functional unit/Haversion system • -made of concentric circles of lamella around a central canal (contains blood vessels) • perforating canals: allow blood vessels in central canals to be linked to circulatory system • covers all bone surfaces except for articular surfaces • can tolerate a lot of stress applied to either end of long bone -cannot tolerate moderate stress applied to shaft Lecture #6 - Bone Tissue Histology of Spongy Bone • does not have osteons -lamellae form rods called trabeculae • found in epiphyses -where stress is handled by joints • much lighter than compact bone -> reduce work of muscles to move bones Types of Bone Cells • osteocytes: mature cells that maintain bone structure by recycling calcium salts -start as osteoblasts • osteoclasts: large cells
More Less

Related notes for ANAT 101

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit