Skeletal System GO pt 1

What is the most obvious function of the skeleton?

Structural Support, supporting the weight of the body

What is the skeletal system composed of?

bones, cartileges, joints and ligaments and other connective tissues

What are the 5 primary functions of the skeletal system? Give a brief description

PBSMS
Protection
Blood Cell Productions
Support
Movement
Storage

What is bone?

Supporting connective tissue

What gives bone its texture?

Calcium salts

What accounts for almost ⅔ of the weight of bone?

Calcium Phosphate

How many bones does a typical human skeleton have?

206

What are the 4 general shapes of bones? Give an example for each

Long - humerus
Short - carpal
Flat - Skull
Irregular - Spine Vertebrae

What are the 2 types of bone tissue?

Spongy and Compact

What is a tendon?

connects bone to muscle

What is a ligament

connects bone to bone

What is the Periosteum?

Covers the outside of the bone

What is the endosteum

Covers inner surfaces of the bone and spongy bone of the marrow cavity

What is an Osteon?

Basic functional unit of compact bone

What is an Osteocyte?

Bone cells

What is an Osteoclast?

50+ nuclei, secretes enzymes and acid stuff that helps dissolve the bone - releases the stuff

What is an Osteoblast?

Involved in the production of new bone

What is Ossification?

Creation of new bone

What is lacunae?

Small pockets that are found between lamellae

What are lamellae?

Narrow sheets of calcified matrix

What are canaliculi?

Small channels radiate through the matrix, interconnecting lacunae and linking them to nearby blood vessels
- Contain cytoplasmic extensions of the osteocytes

What is the Haversian Canal?

Also known as the central canal
Where the osteocytes are arranged in layers around the canal
The canal contains one or more blood vessels

What are trabeculae?

Rods or plates that have branches to create an open network
The arrangement of spongy bone

Where is articular cartilage found?

Found in the epiphyses