What is the Difference Between Notochord and Vertebral Column?

The notochord and vertebral column are both supportive structures found in chordates, but they have distinct differences:

• Structure: The notochord is a flexible rod-like structure derived from mesodermal cells, while the vertebral column is a series of small bones called vertebrae that form the backbone in vertebrates.
• Composition: The notochord is made up of cartilage, whereas the vertebral column is composed of bones.
• Occurrence: The notochord occurs in all chordates during the embryonic stage and in adult lower chordates, while the vertebral column extends from the neck to tail in vertebrate higher chordate animals, running from the skull up to the pelvis.
• Function: The notochord provides support and allows for movement during the embryonic stage, while the vertebral column provides protection for the spinal cord and support for the body in vertebrates.

In summary, the notochord is a flexible, cartilaginous structure that supports the nervous system during the embryonic stage of chordates, while the vertebral column is a series of bones that provide protection and support for the body in vertebrates.

Comparative Table: Notochord vs Vertebral Column

Here is a table comparing the differences between the notochord and the vertebral column:

The key difference between the notochord and the vertebral column is their structure and occurrence. The notochord is a flexible, cartilaginous rod-like structure that supports the nervous tissue in lower chordates, while the vertebral column is a structure made up of 33 vertebrae that run from the skull up to the pelvis in higher chordate animals.