Skeleton System

 Part 1

Unit 2

        Skeleton System

Introduction

Bone :- It is a strong and durable type of connective tissue.

Skeletal system is composed of bone associated cartilages, ligaments, tendons and joints of human body.

Skeleton provide hard framework of human body for protection of smooth argan.

The study of bone and associated structure called osteology.

Two bone articulate together and forms joints.

Joints make the hard and rigid skeleton allow different types of movement at different location.

Human skeletal system composed of 206 bones is divided into two parts_____

1. Axial skeletal system ( 80 bone )

2. Appendicular skeletal system ( 126 bone )

Components of skeletal system

Human skeletal is composed of five main components bones , cartilages , tendon, ligaments and joints.

Bone :- Bone is a tough and rigid form of connective tissue . It is the weight wearing organ of human body and it is responsible for all  strength of human skeletal.

Cartilage :- It is also a form of connective tissue but it is not tough and rigid as bone

Tendons :- A fibrous band of connective tissue that is bonded to bone and connects muscle to bone.

Ligaments: Bands of strong connective tissue called payments hold bone together.

Joints :- A joint is where two or more bone in the body come together.

Composition of bone

Bone consists of ___

Water = 25%

Organic constituents mainly osteon and bone cell = 25%

Inorganic constituents mainly calcium and phosphate = 50%

Types of Bones____

Bone of The Skeleton are classified as_____

Long bone :- it consists of a shaft and two extremities.

Long bone are found in the limbs.

e.g. femur , tibia and fibula

Short Bone 

These bones have no shaft  but they contain a spongy substance covered by a shell  of compact bone.

 They are cubicle in shape. e.g :- carpels (wrist)

The smallest bone of the body is stapes .  It present in middle ears.

Flat bone

They are thin and flattened bones they contain two layer of compact bone with a sponge substance in between. 

e.g. Sternum, ribs and most of the skull bone.

Irregular Bone :- they don't have regular size, shape.

e.g. vertebral bones and bones of the faces.

Sesamoid :- Sesamoid bone are small bone with developed in tendon of muscles.

e.g. patela bone of knee bone