Write a short note on the vertebral column.

(N/A) The vertebral column is formed by $26$ serially arranged units called vertebrae and is dorsally placed.
It extends from the base of the skull and constitutes the main framework of the trunk.
Each vertebra has a central hollow portion (neural canal) through which the spinal cord passes.
The vertebral column is differentiated into the following regions:
$(a)$ Cervical vertebrae $(7)$
$(b)$ Thoracic vertebrae $(12)$
$(c)$ Lumbar vertebrae $(5)$
$(d)$ Sacral vertebrae ($1$ fused)
$(e)$ Coccygeal vertebrae ($1$ fused)
The first vertebra is the atlas and it articulates with the occipital condyles. The second vertebra is the axis.
Functions: The vertebral column protects the spinal cord,supports the head,and serves as the point of attachment for the ribs and musculature of the back. It helps in maintaining posture while standing or walking.