The Skeletal SystemThe Skeletal System

Framework of the BodyFramework of the BodySupport of the bodySupport of the body

The Skeletal System

-it is made up of bones that keep your body upright.

Skeleton- is the hardened framework of the body that serves to support and protect soft tissues.

Two types of SkeletonTwo types of Skeleton

1. 1. Exoskeleton (external)- is a Exoskeleton (external)- is a hard body covering found in hard body covering found in some animals like insects, crabs, some animals like insects, crabs, and shrimps. The organs of and shrimps. The organs of these animals are located inside these animals are located inside the skeleton.the skeleton.

2. Endoskeleton (internal)2. Endoskeleton (internal)

Is a skeleton found inside the Is a skeleton found inside the body of animals with body of animals with backbones like dogs, snakes backbones like dogs, snakes and humans.and humans.

Total number of bones of humansTotal number of bones of humans

Baby- 350 bonesBaby- 350 bones

Adult- 206 bonesAdult- 206 bones

Functions of the Skeletal System

1. It gives shape and form to the body.

2. It serves as anchor to which muscles are attached to help them move.

3. It produce red blood cells.

4. It serves as storage of calcium.

5. It protects some internal organs.

6. Allows us to move.

Parts of the Skeletal System 1. Axial Skeleton (80 bones) a. skull– 29 bones in all

14 facial bones 6 ear bones 1 bone at the back of the tongue 8 cranium bones

b. backbone/spine—attached to b. backbone/spine—attached to the base of the skull.the base of the skull.

--26 bones called vertebrae--26 bones called vertebrae

c. breastbone/sternum-

Sternum/BreastboneSternum/Breastbone

• It encloses the heart and lungs.

• 24 ribs

• 10 pairs are attached to the breastbone

• 2 pairs are floating

2. Appendicular skeleton(126 bones)

• Bones that are attached to the axial skeleton.

• *** collar bones, shoulder blades, arm bones, hipbones and leg bones.

• A. collar bone/clavicle- 2 bones

http://images.google.com.ph/imgres?imgurl=http://www.nickannstreet.com/gallery/main.php%3Fg2_view%3Dcore.DownloadItem%26g2_itemId%3D872%26g2_serialNumber%3D2&imgrefurl=http://www.nickannstreet.com/gallery/main.php%3Fg2_itemId%3D870&h=480&w=640&sz=31&hl=tl&start=1&tbnid=5BgEhpEE2x6rhM:&tbnh=103&tbnw=137&prev=/images%3Fq%3Dcollar%2Bbone%26gbv%3D2%26hl%3Dtl

clavicleclavicle

b. Shoulder blade/scapulab. Shoulder blade/scapula -flat and triangular- 2 bones-flat and triangular- 2 bones

.c. .c. Arm and hand bones-3 bonesArm and hand bones-3 bones

1 upper and two lower1 upper and two lower

27 bones27 bones

d. Hipbonesd. Hipbones• Attached to the backbone

• Hipbones form a ring called the

e. Upper leg/femur-

Longest bone in the body. Lower legs- 2 bones Each foot- 26 bones

Answer the following. • 1. Other term for breastbone.• 2. Number of an adult bone.• 3. Number of a baby bone.• 4. The longest bone.• 5. Two main parts of the skeleton.• 6. The framework of the body.

Assignment: Science 4Assignment: Science 4

Name bones that protect some Name bones that protect some internal organs.internal organs.

Name those bones.Name those bones.Name those bones.Name those bones.

I have a cranium, for my brainium.I have a cranium, for my brainium.And a mandible that's, my jawbone.And a mandible that's, my jawbone.And there's my clavicle, that's my collarbone.And there's my clavicle, that's my collarbone.And my sternum keeps my ribs at home.And my sternum keeps my ribs at home.

Name those bones.Name those bones.Name those bones.Name those bones.

All my vertebrae are running down my backAll my vertebrae are running down my backFrom my head to my pelvic bone.From my head to my pelvic bone.My femur fits in there, a leg bone I declareMy femur fits in there, a leg bone I declareIt's the longest bone that I have grown.It's the longest bone that I have grown.

Name those bones.Name those bones.Name those bones.Name those bones.

Patella fits in next, that's my kneecap,Patella fits in next, that's my kneecap,And below it are two more leg bones.And below it are two more leg bones.My tibia in front, my fibula in back,My tibia in front, my fibula in back,Keep me running at school or home.Keep me running at school or home.

Name those bones.Name those bones.Name those bones.Name those bones.

Now moving down my arm, let's start with humerusNow moving down my arm, let's start with humerusFollowed by two more arm bones.Followed by two more arm bones.There's an ulna and a radiusThere's an ulna and a radiusMy ulna makes up my elbow bone.My ulna makes up my elbow bone.

Name those bones.Name those bones.Name those bones.Name those bones.

All my fingers, all my toes,All my fingers, all my toes,They're called phalanges, everybody knows.They're called phalanges, everybody knows.And on my back you'll find, two shoulder blades in line,And on my back you'll find, two shoulder blades in line,We call them scapula every time.We call them scapula every time.

Name those bones.Name those bones.Name those bones.Name those bones.