Question 1

How do you say Tarsals?

Accepted Answer

Tarsals is pronounced TAR-sulz, with the stress on the first syllable. The first part rhymes with 'car,' and the second part sounds like 'sulz.' Say it fast together: TAR-sulz. Once you hear it a couple of times it feels very natural to say.

Question 2

What does Tarsals mean?

Accepted Answer

Tarsals means the bones of the ankle and rear foot region. The word comes from the ancient Greek word 'tarsos,' which meant the flat of the foot or even a flat wicker basket. Scientists use the plural form because there are always several bones grouped together in this part of the body, not just one.

Question 3

Where are the tarsals located in the body?

Accepted Answer

Tarsals are located in the ankle and the back portion of the foot, between the lower leg bones and the long bones of the midfoot. In humans they sit right where your ankle bends. In dinosaurs they were in the same general position, connecting the tibia and fibula of the lower leg to the metatarsals that led to the toes.

Question 4

How many tarsal bones does a human have?

Accepted Answer

Humans have seven tarsal bones in each foot, for a total of fourteen across both feet. These seven bones are the calcaneus, talus, navicular, cuboid, and three cuneiforms called the medial, intermediate, and lateral cuneiforms. Together they make up the heel, ankle, and the arch of the foot.

Question 5

Did T. rex have tarsals?

Accepted Answer

Yes, Tyrannosaurus rex had tarsal bones, though they were arranged differently from ours. In large theropod dinosaurs like T. rex, some of the tarsal bones fused tightly to the bottom of the tibia over evolutionary time, forming a specialized joint that helped support their massive weight. Paleontologists study these fused tarsals to understand how T. rex walked and how fast it could move.

Question 6

What is the difference between tarsals and metatarsals?

Accepted Answer

Tarsals are the bones of the ankle and rear foot, while metatarsals are the longer bones that make up the middle of the foot leading toward the toes. Think of the tarsals as the ankle group and the metatarsals as the instep group. In dinosaurs, the metatarsals were often very elongated, especially in fast-running species, while the tarsals stayed closer to the ankle joint.

Question 7

Why do scientists care so much about dinosaur tarsals?

Accepted Answer

Scientists care about dinosaur tarsals because the shape and arrangement of these bones can identify what group a dinosaur belongs to more reliably than many other bones. The ankle structure is so distinctive between dinosaurs and crocodile-line archosaurs that a paleontologist can sometimes identify a creature from a single tarsal fragment. This makes tarsals incredibly valuable when only partial fossils are found.

Question 8

Are bird ankles made of tarsal bones?

Accepted Answer

Yes, birds have tarsal bones, but in most species they are fused together and also fused with the metatarsals into a single long bone called the tarsometatarsus. You can see this bone clearly on a chicken leg from the grocery store as the long section below the knee joint. This fusion happened gradually over millions of years of bird evolution from their theropod dinosaur ancestors.

Question 9

Can you find tarsal bones in dinosaur fossils?

Accepted Answer

Yes, tarsal bones are found fairly often in dinosaur fossil sites because they are dense and compact, which helps them survive millions of years of fossilization. At famous sites like the Morrison Formation in the American West and the Yixian Formation in China, paleontologists have recovered detailed tarsal fossils from many different dinosaur species. Some specimens from China are so well preserved that scientists can even see traces of cartilage that once surrounded the bones.

Question 10

What is the crurotarsal joint and how is it different from a dinosaur ankle?

Accepted Answer

The crurotarsal joint is the ankle joint style found in crocodilians and their extinct relatives, where the main hinge runs through the middle of the tarsal bones themselves. Dinosaurs evolved a different style called the advanced mesotarsal ankle, where the hinge sits between the tarsals and the bones of the foot. This difference allowed dinosaurs to stand more upright with their legs directly under their bodies, which is one reason they became such successful and diverse animals.

Question 11

Did all dinosaurs have the same number of tarsal bones?

Accepted Answer

No, the number and shape of tarsal bones varied across different dinosaur groups and changed over evolutionary time. Early dinosaurs and dinosaur relatives from the Triassic period had more distinct, separate tarsal bones. As dinosaur lineages evolved over millions of years, some of these bones fused together or were reduced, so later dinosaurs often had fewer recognizable separate tarsals than their ancestors did.

Question 12

How are tarsals different from a regular ankle?

Accepted Answer

The tarsals are actually the bones that make up what we call the ankle. When you say 'ankle,' you are usually referring to the whole joint and the bump on either side, but the actual hard internal structure of that region is formed by the tarsal bones. The bump on the inside of your ankle is part of the tibia, and the bump on the outside is part of the fibula, but the joint itself is formed where those leg bones meet the tarsal bone called the talus.

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