Question

What are the four primary characteristics of the chordates?

   What are the four primary characteristics of the chordates?

Biology

Peter H. Raven 7th Edition

Chapter 48, Problem 1

Instant Answer

Solved by Expert Nilma Khan

02/22/2022

Step 1

The notochord is a longitudinal cartilaginous rod that runs between the dorsal nerve cord and the digestive tract. It provides support for the nerve cord and is replaced by the vertebral column after the embryonic stage in all vertebrates. In LaTeX format, this Show more…

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What are the four primary characteristics of the chordates?

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Key Concepts

Notochord

The notochord is a flexible, rod-like structure that provides skeletal support and defines the body’s primary axis during embryonic development. It is a key structural characteristic that distinguishes chordates and serves as a precursor to the vertebral column in vertebrate species.

Dorsal Nerve Cord

The dorsal nerve cord is located along the back of chordate embryos and later develops into the central nervous system, including the brain and spinal cord in vertebrates. This structure is essential for the coordination and control of bodily functions, marking a significant evolutionary advancement over ventral nerve cords found in other organisms.

Pharyngeal Slits

Pharyngeal slits are openings in the pharyngeal region of chordate embryos. In aquatic species, these slits often develop into gill structures used for respiration, while in terrestrial chordates, they can form various anatomical features. Their presence is considered a fundamental trait that links all chordates together.

Post-Anal Tail

The post-anal tail is an extension of the body beyond the anal opening and is present in some form in chordate embryos. This structure can aid in locomotion, particularly in aquatic environments, and, even when reduced or absent in adults, it highlights a shared developmental blueprint among chordates.

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