The Skeletal System

• The skeletal system is the structure of your body. The

skeleton is the center of your body.

What The Skeletal System Made Of

• The skeletal system is a

system where bones

are connected to make

a skeleton.

How Many Bones Are In Your Body?

• Each adult skeleton

has 206 bones in

your body! 26 bones

in each of your feet

and 27 bones in your

hands! Your skull

has 23 bones!

Do blood vessels go through your bones?

• Blood vessels run through

the bones because the

bone cells need to have

water, food, and oxygen.

Blood vessels also run

through the bones of your

body because there is

bone marrow in your

bones. Bone marrow

creates the blood cells in

your vessels.

Types Of Bones• There are three types of bones; the

hollow bones, the flat ones, and the

solid bones. Solid bones are bones

that are not flat and aren’t hollow.

They are found in your arms, legs,

feet, and hands. Solid bones carry

the most bone marrow out of the

types of bones. Flat bones are bones

that aren’t hollow and are not round.

Flat bones don’t carry a lot of bone

marrow. Hollow bones don’t have

any bone marrow in them. Hollow

bones are found in your head.

Inside Your Bones

• Inside your bones is were blood cells are created.

The tissue is called bone marrow. Bone marrow is

a soft tissue that can reproduce blood cells.

Bone Connections

Bones are connected by

ligaments and joints. There

is two types of joints: Ball

and socket joints and hinge

joints. Ligaments are small

strings of cells that connect

different bones.

Bone Protection

Certain bones in your body protect organs. Your skull protects you brain and your rib cage protects your heart and lungs.

Your Cranium• Your head has 22 bones

in the skull and three

bones in each of your

ears for a total of 28

bones. Only 6 of those

bones move!

Your Ear BonesThere are three bones

that are in your ear. The

bones are called the

anvil, hammer, and

stirrup. The the hammer

strikes the anvil which

creates a sound that

travels to the stirrup

and creates a sound

that travels to your ear

drum. That is how sound

in your ear is created.

Your Shoulder Bones • Your shoulders

are made up of

your clavicle

(collarbone),

Vertebrae

(backbones),

and your

Scapula

(shoulder

blades).

Your Arm Bones

• Your arm bones help

support your arm

muscles. It takes two

muscles to move your

arm up and down. The

bones are the humorous,

ulna, and radius.

Your Hand Bones

• There are 16 bones in

your hand. There is 6

carpals, 5 metacarpals,

and 5 phalanges.

Your Rib Cage

• 37 bones make

up your rib cage.

There are 24 ribs,

12 vertebrae, and

a sternum.

Your Leg Bones

• The leg bones help you walk, swim,

kick, and run. Without your leg

bones, you wouldn’t be able to

stand.

Connections

• The Skeletal system

interlinks with three

other systems. The

systems are the

Nervous system,

Muscular system, and

the Immune system.

Fun Facts

Did you know that your radius is the most common bone that gets broken?Did you know that it takes six muscles to move your arm straight up? Did you know that you have 207 bones as a baby and 206 as a adult.

About The Author…

• Zachary Chambers currently lives in Arden Park,

Sacramento, California. His favorite food is sushi and loves

to pick apart butterflies. He is currently training to be an

entomologist. An entomologists are people that study

insects.