- from a
different lineal origin.
Pikaia appears to have a proto-
notochord, and
notochords are
present in
several basal chordates such as Haikouella, Haikouichthys...
- subphyla:
Vertebrata (fish, amphibians, reptiles,
birds and mammals),
whose notochords are
replaced by a cartilaginous/bony
axial endoskeleton (spine) and are...
-
embryonically and
evolutionarily from the
notochord.
Hagfish are the only
extant vertebrate whose notochord persists and is not integrated/
replaced by...
- slow-growing
neoplasm thought to
arise from
cellular remnants of the
notochord. The
evidence for this is the
location of the
tumors (along the neuraxis)...
-
column (commonly
known as a
spine or backbone),
which evolved from the
notochord. It is a
paraphyletic grouping including all
animals excluding the chordate...
- Chordata, a
phylum which includes all
animals with
dorsal nerve cords and
notochords (including vertebrates). The
subphylum was at one time
called Urochordata...
- and
eponymous characteristic of the
vertebrate endoskeleton,
where the
notochord (an
elastic collagen-wrapped
glycoprotein rod)
found in all chordates...
- This
forms the
notochord,
which induces the
formation of the
neural tube, and
establishes the anterior-posterior body axis. The
notochord extends beneath...
-
million years ago
during the
Cambrian explosion,
fishlike animals with a
notochord and eyes at the
front of the body, such as Haikouichthys,
appear in the...
- rise to
notochord starts as the
notochordal process,
whose formation finishes at day 20 in humans.
important not only in
forming the
notochord itself but...
