Characteristics and description of the phylum (Chordata)
4 Key Features: a notochord, a dorsal hollow nerve cord, pharyngeal slits and a post-anal tail. These characteristics are only present in some chordates during development.
Notochord: a flexible structure that resembles a rod that forms the main support of the body; a primitive spine. Provides support and gives the phylum its name. Also develops into the vertebral column in vertebrates.
Nerve Cord: a dorsal tubular cord of nervous tissue above the notochord. Develops into the central nervous system-the brain and the spine.
Pharyngeal Slit: opening in the pharynx that develops into gill arches in bony fish and into the jaw and inner ear in terrestrial animals.
Post-Anal Tail: a skeletal extension of the posterior end of the body; being absent in humans and apes, although present during embryonic development. Aids in balance.
4 Key Features: a notochord, a dorsal hollow nerve cord, pharyngeal slits and a post-anal tail. These characteristics are only present in some chordates during development.
Notochord: a flexible structure that resembles a rod that forms the main support of the body; a primitive spine. Provides support and gives the phylum its name. Also develops into the vertebral column in vertebrates.
Nerve Cord: a dorsal tubular cord of nervous tissue above the notochord. Develops into the central nervous system-the brain and the spine.
Pharyngeal Slit: opening in the pharynx that develops into gill arches in bony fish and into the jaw and inner ear in terrestrial animals.
Post-Anal Tail: a skeletal extension of the posterior end of the body; being absent in humans and apes, although present during embryonic development. Aids in balance.