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Like most pulsars, the Crab Nebula neutron star is known only by its radio pulses.
Pharyngeal Pouches
Embryonic structures in vertebrates that may develop into various parts of the face, neck, and respiratory system.
Notochord
A flexible, rod-shaped structure found in the embryonic stage of all chordates that provides skeletal support and defines the primitive axis of the embryo.
Dorsal Hollow Nerve Cord
A distinctive feature of chordates, this is a nerve cord found along the back or dorsal side of the organism.
Notochord
A flexible rod made out of a material similar to cartilage that provides support in the embryonic stages of all chordates, including humans.
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