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becomes the nucleus pulpous
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What happens to the notochord as a bat develops?
During the development of most vertebrates, the notochord becomes the nucleus pulpous. In some species, such as the sturgeon and hagfish, the notochord remains even after adulthood is reached.
Difference between notochord and vertebral coloum?
1) The notochord is the defining structure of the phylum Chordata, which includes all vertebrates. In its "mature" state, the notochord is a rod of large cells constrained by a thick extracellular sheath and positioned between the developing spinal cord and gut. Turgor pressure generated by notochord cells exerted against the sheath gives the notochord stiffness, imparting the mechanical properties required for one of its main functions as the central axial skeletal element of the developing embryo. 2) The notochord exists transiently during the life of most vertebrates. During its short life, however, the notochord plays another critical role for developing embryos,.producing a variety of secreted growth factors, such as Sonic hedgehog, which instruct surrounding tissues to acquire particular differentiated fates. A number of embryological experiments, for example, tell us that, without notochord-derived signals, motorneurons in the spinal cord would not form, the pancreas insulin-producing cell would not differentiate, and the body muscles would not be produced properly. Without the axial skeletal support of the notochord, many lower vertebrate larvae, such as fish fry and tadpoles, become severely shortened and cannot swim or feed properly. Thus many of the mutations affecting zebrafish notochord development are named after the seven dwarves.
What phylum is most closely related phylogenetically to first vertebrates?
The phylum Chordata is most closely related phylogenetically to the first vertebrates. Chordates share a number of characteristics with vertebrates, such as having a notochord, dorsal nerve cord, and pharyngeal slits. Cells within the notochord further develop into the vertebrae that define vertebrates.
Most stress bearing vertebrae?
The lower lumbar vertebrae are the most stress bearing vertebrae.
Which area of the spine has the most vertebrae?
The thoracic spine has the most vertebrae - twelve.
How to get chordoma?
A chordoma is a rare type of cancer that develops from the notochord. The notochord forms the early spine in a foetus as it develops inside the womb. After about six months, most of the notochord is replaced by the bones of the spine. However, small amounts of the notochord may remain, and these can sometimes develop into a chordoma.
What is a description of characteristics of all vertebrates?
At some stage of their life they all have: notochord dorsal hollow nerve cord pharyngeal pouches post anal tail endoskeleton highly cephalized highly developed sense organs and brain most possess segmented vertebrae most have paired appendages closed circulatory system
The firm flexible rod found in the dorsal area in chordates?
The firm flexible rod found in the dorsal area of chordates is called the notochord. It provides support and structure to the body, and is present during early development in all chordates. In most vertebrates, including humans, the notochord is eventually replaced by the vertebral column.
What animal has the most vertebrae?
The animal with the most vertebrae is the snake. Some species of snakes can have over 300 vertebrae in their body, allowing them to be extremely flexible and agile.
Which type of vertebrae takes up the most space on a human's spine?
The thoracic vertebrae take up the most space on a human spine.
At some point in their lives all chordates have what characteristics?
All chordates have a notochord at some stage in their development, even if it is only at the embryonic stage. The notochord is a flexible structure located in front of the dorsal nerve, which all chordates also have.
Which vertebral part is most anterior in location?
The vertebral body is the most anterior part of a typical vertebrae. It is the weight-bearing portion of the vertebrae and serves as the main point of articulation with adjacent vertebrae in the spinal column.
