Notochord
Notochord
Notochord (/ˈnoʊtoʊkɔːrd/) is a flexible rod-shaped structure found in the embryonic stage of all chordates. It plays a pivotal role in the development of the nervous system and the formation of the vertebral column.
Etymology
The term 'Notochord' is derived from the Greek words 'νῶτον' (nōton), meaning 'back', and 'χορδή' (chordē), meaning 'string' or 'cord'.
Function
The notochord serves as the primary axial support for the body in the embryonic stage of chordates. It provides rigidity and acts as a base for the development of the vertebral column. The notochord also plays a crucial role in the development of the nervous system by inducing the formation of the neural tube.
Development
The notochord develops from the mesoderm, one of the three primary germ layers in the very early embryo. The mesoderm cells migrate and form a rod-like structure in the midline, known as the notochord.
Related Terms
- Chordates: A large phylum that includes all animals with a notochord, such as vertebrates.
- Mesoderm: The middle layer of an embryo from which the notochord and other structures develop.
- Neural Tube: A tube of neural cells in embryos that develops into the brain and spinal cord.
- Vertebral Column: The series of vertebrae that extend from the skull to the tailbone, providing support and housing the spinal cord.
External links
- Medical encyclopedia article on Notochord
- Wikipedia's article - Notochord
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