Names matter

These body parts have a proper name that most people don’t know about

Would you be able to confidently point at your pinna if asked? Or could you say how many canthi a person has? Each part of our body has a specific name—sometimes more than one—but we don’t always use them or even know them, especially if a popular version exists. The big toe, the bit of flesh between the index and the thumb, the space between the brows, all these have a proper name that is rarely used. Let’s discover the proper way to refer to some parts of our body.

We typically refer to the space beneath the shoulder as the armpit or underarm, but the technical name for it is axilla. The name comes from a diminutive form of the Latin ala, meaning ‘wing’ or ‘upper arm’, which would make the armpit the ‘little wing’.

This ‘little wing’ serves as a passageway for important nerves, blood vessels, and lymph nodes that supply our upper arm, making it a vulnerable spot but also very sensitive and ticklish, as our body instinctively tries to protect the area.

There is a reason why we call the top of the upper lip the "Cupid’s bow". The philtrum, or the vertical groove that goes from the button of the nose to the lip, is named after the Greek word phíltron, meaning ‘love spell or charm’.

This area was once considered to possess a special beauty, and the philtrum was the path where Cupid's love arrows would land. Anatomically, its role in humans is debated; while some researchers consider it a leftover from our evolutionary past with little remaining function, others have proposed it may still play minor roles, such as in upper lip mobility. In other mammals, it's more clearly tied to the sense of smell, helping direct scent molecules toward specialized olfactory organs.

How do you refer to the space between your eyebrows? While most of us say "the space between the eyebrows", the correct name is glabella, a Latin word meaning ‘smooth’ or ‘hairless’.

The origin of the name is quite straightforward: while many mammals have "eyebrows", their brow bones are protruding and are often completely covered in fur. In humans, the brow bone is flat and smooth, and the area between the brows is typically hairless.

No one really knows how the bit of skin between the thumb and the index finger came to be called purlicue. Some say that it is a combination of the Scots pirlie (‘curl’) and the French cue (‘tail’)

This term was first used for squiggly writing or for the decorative flourish at the end of a word, but etymologists still can’t explain how it came to be used for the curve of the hand.

The term ‘ear’ encompasses both the outer and inner parts of the ear, but each component has its own name. Pinna, meaning ‘wing’, is the proper name of the visible ear, sometimes also called auricle, including both the cartilaginous and the fleshy part.

Although the inner ear is mainly responsible for converting sound into electrical signals and sending them to our brain, the pinna acts like a funnel that amplifies the sound vibrations and directs them into the ear canal.

We have specific names for every finger, but what about the toes? The names for the toes mirror those of the fingers (index, middle, ring, pinky), except the big toe, which is called the hallux, after the Medieval Latin hallex, meaning ‘great toe’.

However, this scientific name still has a connection with the thumb, as linguists believe that the spelling of hallux was influenced by the Latin word pollex, meaning ‘thumb’.

Several parts of the human body have a frenum (or frenulum), or a small band of tissue that restricts a mobile organ, such as the one connecting the underside of the tongue with the mouth.

This name comes from the Latin frenum, meaning ‘rein’ or ‘bridle’, equating the way tissue anchors and restricts the movement of the organ to how a rein directs and controls an animal.

If you thought that the corners of our eyes didn’t have a proper name, you are in for a surprise. The spot where the upper and lower lids meet —both inner and outer— is called canthus (canthi in plural), after the Greek kanthós, meaning ‘angle’ or ‘corner’.

Over the inner canthus, some people have a skin fold, called epicanthus (‘above the canthus’) or epicanthic fold. The shape of this fold —influenced by genetics, age, or medical conditions— often results in the upper lid being partially or completely hidden when the eye is open.

We often call it the cheekbone, but the proper name for it is zygoma, meaning ‘yoke’ or ‘bolt’ in Greek. Why was this name chosen? This bone acts like a bridge or yoke that connects the facial bones with the skull.

The scientific name for this bone is quite old, dating back to the 2nd century and to famous physicians such as Galen, who were the first to compare the cheekbone with a yoke. However, the term entered the English language only in the late 17th century.

Our nose has two nares or nostrils, separated by a strip of skin. Have you ever wondered if that small piece had a name? Well, it does, and it’s called columella, a diminutive form of the Latin columna (‘column’ or ‘pillar '), reflecting how the strip of nasal tissue stands like a column between the nostrils.

This word entered English in the 16th century, but it wasn’t only used to describe the human nose. Instead, it was adopted by many scientific fields to describe different structures that resembled a column.

Is there a clear distinction between the chin and the point of the chin? We often call the point of the chin just ‘chin’, but it's actually called the gnathion, derived from the Greek gnathos (‘jaw’ or ‘mouth’).

Gnathion is the diminutive form of gnathos, and could be translated as ‘little chin’. While anatomically, ‘chin’ describes the entire forward part of the lower jaw, the term gnathion refers to the pointiest part of it.

Facts you didn't know you needed

Is the day longer for your pet? Mind-blowing facts you need to know

Adults often assume they already understand the world, but there’s always something new to surprise us! Did you know that clouds actually have weight? Or that the day is longer for some animals? And that’s just the beginning. From hidden functions of your organs to the true color of the universe, today you’ll learn 10 fascinating facts you probably never thought to ask, but will make you sound impressively smart in your next conversation!

Unlike humans, animals don’t experience a shared "present" in quite the same way. Instead, their sense of time is tied to the rhythms of their own bodies. For very small animals with fast metabolisms like parrots, hamsters, or guinea pigs, time actually seems to pass more slowly. In a sense, they live in slow motion because their faster-working nervous systems allow them to process sensory information at a fast speed.

What if someone commits a crime and tries to blame their identical twin? Have you ever wondered about that? It’s a valid question; after all, identical twins not only look alike, they also share the same DNA. But here’s the surprising part: if investigators check fingerprints, the innocent twin could be cleared. That’s because, despite their nearly identical DNA, twins have unique fingerprints, shaped by subtle genetic and environmental factors in the womb.

You’ve probably spent time lying on the grass, watching clouds drift across the sky. They look light, fluffy, almost like cotton candy, and it’s hard to imagine them as heavy objects. But the truth is surprising: clouds are incredibly heavy. An average cumulus cloud can weigh around 1 million pounds! That impressive weight comes from the billions of tiny water droplets suspended in the air. So, how do they float? It’s because each droplet is extremely small and falls very slowly, while rising warm air currents help keep the cloud suspended above us.

Most of us have a rough image of the world map in our minds. But we have something to tell you: most maps aren’t completely accurate. Because the Earth is a sphere, cartographers have to distort some areas to represent it on a flat surface. On Mercator projection maps, countries near the poles appear much larger than they really are, while countries near the equator look smaller in comparison. For example, Alaska looks about the same size as Brazil, but in reality, Brazil is nearly five times larger!

Most people don’t realize that there’s actually a name for the color of the universe. Strange, right? But it’s true! Astronomers who studied the light from thousands of galaxies discovered that if you blend all the colors from the observable universe, the result is a soft, beige-ish white shade, famously named "Cosmic Latte" in 2002.

With 50 states, there’s no shortage of variety in their names. Almost every letter of the English alphabet appears at least once, except for one: Q, which is completely absent. In addition to this, there’s another surprisingly rare letter: J. While it isn’t entirely missing like Q, it only appears in one state, New Jersey.

Although we don’t notice it, indeed, the Earth’s rotation is gradually slowing. This happens because tidal friction, caused by the Moon’s gravitational pull on our oceans, creates a subtle drag on the planet’s spin. As a result, days are getting longer, but very gradually: by only about 1.7 milliseconds per century.

Do you remember your last dream? Whether good or bad, dreams are a constant part of sleep, but not everyone experiences them in the same way. Deaf people who use sign language in their daily lives often communicate through signs in their dreams, too. Meanwhile, blind people tend to have dreams rich in sounds, smells, and tactile sensations, using these other senses to experience the dream world.

We’re used to seeing hippos covered in mud, splashing in water, or barely peeking above the surface. But here’s a surprise: hippos can’t actually swim! That’s right. Because of their huge, heavy bodies, they don’t float or paddle like most animals. Instead, they walk or run along the riverbed.

Can your brain really "eat" itself? Well, close, but not exactly. There’s a process called phagocytosis, carried out by specialized immune cells in the brain known as microglia. These cells engulf and remove debris, dead cells, and other unwanted material. But don’t worry; it’s safe! The mechanisms exist to protect, repair, and maintain your brain.