Question 1

How do you say Neural Spine?

Accepted Answer

Neural Spine is pronounced NYOOR-ul SPYNE. The first word rhymes with 'ural' and starts with a soft 'ny' sound, like the beginning of the word 'new.' The second word is exactly like the word spine you already know, as in backbone. Put them together and say NYOOR-ul SPYNE.

Question 2

What does Neural Spine mean?

Accepted Answer

A neural spine is a bony spike or blade that projects upward from the top of a vertebra, which is one of the bones in the backbone. The word neural refers to nerves, because this spike sits right above the spinal cord. The word spine comes from the Latin word for thorn. Together, the term describes a thorn-like bone that protects the nervous system.

Question 3

What dinosaur had the biggest neural spines?

Accepted Answer

Spinosaurus had some of the largest neural spines ever found in any animal, with individual spines reaching up to 1.65 meters, or about 5.4 feet, in height. For comparison, that is taller than many adult humans. Scientists debate whether these enormous spines supported a sail of skin or a thick muscular hump. Ouranosaurus, a plant-eating dinosaur from Africa, also had remarkably tall neural spines.

Question 4

Did Spinosaurus have a sail or a hump on its back?

Accepted Answer

Scientists are still actively debating this question. For many decades, most reconstructions showed Spinosaurus with a tall skin sail like a fish fin. However, a major 2014 study by paleontologist Nizar Ibrahim found that the neural spines had very dense bone tissue, which is more similar to a hump-forming structure than a thin sail. Many scientists now lean toward the hump interpretation, but the debate is not fully settled.

Question 5

Do humans have neural spines?

Accepted Answer

Yes, humans have neural spines too. If you run your fingers down the middle of your back, those bumps you feel are the tips of your neural spines sticking out from each vertebra. Human neural spines are much smaller and less dramatic than those of sail-backed dinosaurs, but they serve the same basic function: anchoring muscles and protecting the spinal cord. Every animal with a backbone has them.

Question 6

What were neural spines used for in dinosaurs?

Accepted Answer

Neural spines served several purposes. In all dinosaurs, even small ones, they provided attachment points for the powerful back and neck muscles the animals needed to move. In dinosaurs with very tall neural spines, scientists think the structures may have helped regulate body temperature, stored fat and energy like a camel's hump, or served as visual display structures to attract mates and intimidate rivals. Different dinosaurs may have used them differently.

Question 7

Is Dimetrodon a dinosaur with neural spines?

Accepted Answer

Dimetrodon is famous for its enormous sail made of tall neural spines, but it was not actually a dinosaur. It was a synapsid, a group more closely related to mammals than to reptiles, and it lived about 295 to 272 million years ago, which is roughly 40 million years before the first true dinosaurs appeared. Many people confuse Dimetrodon with a dinosaur because of its dramatic appearance, but paleontologists classify it as a very different kind of animal.

Question 8

How do scientists study neural spines in fossils?

Accepted Answer

Scientists use several techniques to study fossilized neural spines. They examine surface textures under microscopes to understand what tissues covered the bone in life. CT scanning lets researchers see inside fossils without damaging them, revealing internal bone structure. Bone histology, which involves cutting thin slices of bone and examining them under a microscope, shows how fast the bone grew and how dense it was. These methods helped scientists re-evaluate Spinosaurus's back structure in the 2014 landmark study.

Question 9

Why are some dinosaur neural spines so much taller than others?

Accepted Answer

The height of neural spines varied enormously across different dinosaur species because evolution favored different traits in different environments and lifestyles. In species where displaying to rivals or mates gave a survival advantage, taller spines may have evolved because animals with more impressive backs attracted more mates or scared off more competitors. In species living in hot environments, tall spines might have helped with temperature regulation. The variety of heights reflects the many different ecological pressures different dinosaurs faced.

Question 10

What is the difference between a neural spine and a vertebra?

Accepted Answer

A vertebra is the complete individual bone that makes up part of the backbone. A neural spine is just one specific part of a vertebra, specifically the pointed or blade-like projection that sticks upward from the top of the bone. Think of a vertebra as a whole LEGO brick, and the neural spine as one particular tab sticking up from it. Every vertebra has a neural spine, but the neural spine is only one component of the entire vertebra.

Question 11

Could neural spines change color in living dinosaurs?

Accepted Answer

Fossils preserve bone but almost never preserve color, so scientists cannot know for certain what color dinosaur neural spines or the skin over them might have been. However, scientists can look at living animals for clues. Many modern reptiles and birds use brightly colored skin, crests, and fins for communication and display. If dinosaur neural spines were used for display, which many scientists suspect, they may well have been brightly colored or patterned, but this remains a fascinating open question.

Question 12

What dinosaur had neural spines on its neck?

Accepted Answer

Amargasaurus, a sauropod dinosaur discovered in Argentina from rocks dating to about 130 million years ago, had a remarkable double row of elongated neural spines running along its neck and back. Some scientists think these formed two parallel skin sails, while others believe they supported a series of spikes. Amargasaurus is unique among sauropods for this feature, and paleontologist Jose Bonaparte first described it in 1991 from fossils found in the La Amarga Formation.

Question 13

Are neural spines the same as spikes or horns?

Accepted Answer

Neural spines are related structures but not exactly the same as the spikes and horns seen in dinosaurs like Stegosaurus or Triceratops. Neural spines grow directly from the vertebrae of the backbone and are always made of bone that is part of the spine. The plates of Stegosaurus, for example, grew from the skin rather than directly from the vertebrae, making them a different type of structure called osteoderms. Horns on the face, like those of Triceratops, also grow from different bones entirely.

Question 14

When was the term neural spine first used in science?

Accepted Answer

The term neural spine has been used in vertebrate anatomy since at least the early 19th century, when anatomists were systematically describing and naming all the parts of the skeleton. By the time Richard Owen coined the word dinosaur in 1842 and began formally describing dinosaur fossils, neural spine was already established scientific vocabulary. The roots of the term, the Greek neuron and the Latin spina, reflect the European tradition of using classical languages to create precise scientific terminology that is consistent across different modern languages.

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