Hello everyone in this post I would like to discuss Knowledge About Axial And Appendicular Skeleton. You might have seen a very common invertebrate the earthworm, which is generally found in the soil. Have you ever thought about why it always crawls on the ground? Why it moves so slowly? why it can not stand erect like human beings and other mammals? I will give you a short answer for these questions which is " it does not have any skeleton which can support it to stand erect and move faster". So in this post, you can see a world that is Skeleton. if you guys Don't know about Skeleton. So first of I will Discuss a short definition of Skeleton or skeletal System.
Human Skeleton Or Skeletal System
The short definition of the Skeletal system is " The frame working of the Hard structure of the body to give protection and support to the body is called the Skeletal system. The skeletal system provides helps in locomotion. Like other vertebrates, the human skeleton is inside the body i.e. it is an endoskeleton. The skeleton is made of living tissues. So this was the short definition of the Human Skeleton or Skeletal system. Human Skeleton has two parts. i.e. Axial Skeleton and Appendicular skeleton.
Now is the time to explain The knowledge about Axial and Appendicular Skeleton.
Knowledge About Axial And Appendicular Skeleton
First of all, I would like to explain The Axial Skeletal System and then I will discuss the Appendicular skeleton. I'm trying my best to explain the Axial And appendicular skeleton step by step You guys can see this Post.
Axial Skeletal System
The term axis means the central point around which other structures are distributed. This system lies at the center of the Body. The Axial Skeleton Includes the skull, the vertebral column, the ribs, and the sternum. This system has these likes parts which I am going to discuss in this Post under;
1: Skull:
The Skull is made of a cranium which protects the brain. Skull has a total of 22 Bones. It has 8 bones in the skull while the remaining 14 bones are present in the face. Skull is also made of facial bone.
2: Vertebral Column:
The vertebral column extended from the Skull to the pelvis. It consists of the spinal cord which protects and stands erect. The vertebral column consists of 33 vertebrae which are named according to their location. Those 7 vertebrae present in the neck are called cervical vertebrae. While 12 vertebrae present in the chest region are called Thoracic vertebrae. Five vertebrae that lie in the back region are termed the lumbar vertebrae and those nine found between the Lowe limbs area are called pelvic vertebrae. Thus the pelvic vertebrae make two sets i.e sacrum and coccyx. Sacrum five and coccyx 4 are called tail bones. So this was the vertebral column.
3: Chest Bone and Ribs
So there is a total of 12 Pairs of ribs in the human body. In which these 12 Pairs of ribs 10 Pairs of ribs are attached to the sternum and 2 pairs are floating ribs not attached to the sternum. The Ribcage provides support to the thoracic cavity in which vital organs like the Heart, lungs, etc are present.
4: Middle ear Bone
Each human ear has three bones called ossicles. These are the mallus, incus, and stapes.
5: Neck Bone
There is one bone in the neck called the hyoid bone.
Now I will discuss the second part of the Skeletal system called the Appendicular skeletal system.
Appendicular Skeletal System
The skeleton which arises from the Axial skeletal system is called Appendicular Skeletal System. This system Has the following Parts you can see in this Post.
1: Pectoral Girdle
This kind of pectoral Girdle attaches the forelimbs to the vertebral column. It is comprised of 4 bones of the shoulder (2 bones on each side).
2: Forelimbs (Arms and Hands)
The arms contain 6 bones (3 In each arm). The hands contain 54 bones ( 27 in each hand).
3: Pelvic Girdle
The Pelvic girdle attaches the hind limbs to the vertebral column. It consists of 2 bones.
4: Hind Limbs
The legs contain 8 bones (4 in each leg) while both feet contain 52 bones (26 in each foot).
So this is all about Knowledge About Axial And Appendicular Skeleton. Now there is a tidbit which I want to discuss in front of you and that is, At the time of birth human infants have 350 bones in their body. As a baby grow up towards adult stages, many of these bones fuse together and their number reduces to 206. The largest bone is the femur whereas the smallest bone is found in the internal ear.
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