The ________ is an embryonic midline structure common to all members of the phylum Chordata that serves as a source of midline signals to surrounding tissues and as a major skeletal element of the developing embryo.
notochord
The correct answer is notochord.
Signaling from the notochord involves the release of various molecules, most notably Sonic Hedgehog (Shh). Shh secreted by the notochord ventralizes the developing neural tube, influencing the differentiation of motor neurons, and also patterns the somites, which give rise to vertebrae, ribs, and muscles. The notochord's role as a skeletal element provides rigidity along the anteroposterior axis, allowing muscles to work efficiently for locomotion, particularly in aquatic forms.
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