What is the Difference Between Notochord and Nerve Cord?

The notochord and nerve cord are two characteristic features of chordates, but they serve different functions and are part of different systems within the organism. Here are the key differences between them:

• Notochord:

1. It is a longitudinal, solid rod-like structure that supports the body of chordates.
2. The notochord belongs to the skeletal system.
3. It provides structural support and sites for the attachment of various muscles.
4. The notochord is found in all chordates.

• Nerve Cord:

1. It refers to the major cord of nerve fibers, which later develops into the spinal cord of vertebrates.
2. The nerve cord belongs to the central nervous system of chordates.
3. It coordinates nerve impulses that arrive from the peripheral nervous system.
4. The nerve cord is found in both vertebrates and invertebrates.

In summary, the notochord provides structural support to the body, while the nerve cord is involved in transmitting nervous impulses and coordinating the functions of the body.

Comparative Table: Notochord vs Nerve Cord

Here is a table highlighting the differences between the notochord and nerve cord:

The notochord is a rod-like structure that provides support and sites for muscle attachment, while the nerve cord is a chain of ganglia that coordinates nerve impulses from the peripheral nervous system. The notochord is found in all chordates and originates from the mesoderm, while the nerve cord is found in both vertebrates and invertebrates and originates from the ectoderm.