CHORDA DORSALIS Meaning and
Definition
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Chorda dorsalis, also known as the notochord, is a distinct anatomical structure found in the embryos of certain animals. It is an elongated, flexible rod-like structure that runs along the length of the body, occupying the dorsal (back) region. The notochord plays a vital role in the early development of many chordates, serving as a support and signaling structure.
In vertebrates, such as fish, amphibians, and some reptiles, the notochord is the precursor to the spinal column (vertebral column). It provides structural support and acts as a primitive axial skeleton during the early stages of embryonic development. Eventually, it becomes partially or fully replaced by the more complex and specialized vertebrae.
The notochord is composed of specialized cells called chordocytes, which secrete a gelatinous substance known as notochordal matrix. This matrix gives the notochord its characteristic flexibility and resilience. It also acts as a signaling center, releasing important molecules that regulate the formation and differentiation of various tissues and structures in the developing embryo.
While the notochord is primarily associated with embryonic development, remnants of this structure may persist in certain adult animals. For instance, in some species of fish, the notochord persists throughout their lifetime, providing additional support for the body.
Overall, the chorda dorsalis is a fundamental structure that plays a crucial role in the early development and organization of the body plan in many chordates, serving as a scaffold for subsequent skeletal development and providing signaling molecules for tissue differentiation.
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(1) The notochord; (2) the spinal cord.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Common Misspellings for CHORDA DORSALIS
- choerdadorsalis
- c horda dorsalis
- ch orda dorsalis
- cho rda dorsalis
- chor da dorsalis
- chord a dorsalis
- chorda d orsalis
- chorda do rsalis
- chorda dor salis
- chorda dors alis
- chorda dorsa lis
- chorda dorsal is
- chorda dorsali s
Etymology of CHORDA DORSALIS
The word "chorda dorsalis" is derived from Latin.
- "Chorda" comes from the Latin word "chordā", meaning "cord" or "string".
- "Dorsalis" is derived from the Latin word "dorsum", meaning "back" or "ridge".
Therefore, when combined, "chorda dorsalis" translates to "dorsal cord" or "dorsal string" in English. This term is commonly used in anatomy to refer to the notochord, which is a flexible rod-like structure found in the embryonic stage of vertebrates.
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