The skeletal system (by table7)

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by MrReGlog
Last updated 8 years ago

Discipline:
Science
Subject:
Human Anatomy

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The skeletal system (by table7)

Bone Formation

The Skeletal System

The skeleton supports the body, protects internal organs, provides for movement, stores minerals, and provides a site for blood cell formation.re

As an embryo the skeleton is made up of cartilage, which does not contain blood vessels and is very flexible. However, ossification occours when osteoblasts secrete mineral deposits that replace cartilage. When the osteoblasts become surrounded by bone tissue, they mature into osteocytes. Many lng bones have growth plates on either end. The growth ovf cartilage at these plates cause the bones to lengthen until all the cartalige is replaced, the bone becomes completely ossified, and the person "stops growing".

Joints can be classified into three catagories: -Immovable, such as the plates in the skull, -Slightly Moveble, restricted movement, i.e. vertebre-Freely Movable, permit movement, multiple types (shown below)

Bones are a solid network of living cells and protein fibers that are surroundd by deposits of calcium salts.

Important Vocab-periosteum: a tough layer of conected tissue that surrounds the compact bone-Haversian canals: run through the compact bone and contain blood vessels and nerves.

Bone Marrow: 2 types:-Yellow: stores fat-Red: produces red blood cells, some types of white blood cells, and platelets.

In freely movable joints cartilage protects the bones where they connect. Additionally in some joints small sacs of synovial fluid called bursae reduce friction between bones. The joint is surrounded by a joint capsule that consists of two layers-Ligaments hold bones together-Cells in second layer produce lubracting synovial fluid.

Osteoporosis is a disorder found in older people, especially women, is a loss of calcium that can lead to a weakening of the bones. Osteoporosis can cause many serious fractures. It is best prevented by weight bearing exercise and a calcium rich diet.

Chiropractor: Diagnose and treat problems acossiated with the nuroskeletal system particularly the spine. To become a chiropractor one must first complete at least 2 years of an undergraduate degree, specifically, 90 credit hours of schooling. After completing this required undergraduate schooling, students can apply to specialized four-year programs at chiropractor schools. However, because of the reletivly few programs, only the best students are accpted. After graduating, they must obtain a state license.


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