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Cervical spine
The cervical spine consists of seven vertebrae from C1 to C7.
These vertebrae start at the bottom of the skull and spread down to the thoracic spine.
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The cervical vertebra close to the skull is C1 and is the smallest cervical vertebra.
As it goes down to C7 get into bigger in size.
Likewise all of the cervical vertebrae are smaller than the thoracic vertebrae.
Cervical vertebrae C3 , C4, C5, C6 are known as typical vertebrae because have the same basic features with most of the vertebrae throughout the spine.
In between the two vertebrae there lies a soft pad like structure called inter vertebral disc which function as a shock absorber like when a person walk, run or jump.
The spinal cord is a long, thin, tubular bundle of nervous tissue about 18 inches long runs within the protective spinal canal from the base of the brain to the end of the spine.
The spinal cord serves as the transmission path way to rely messages between the brain and the rest of the body.