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Human Body Measurement Science — For Every Body!

A woman studying an open Latin anatomical lexicon in a library reading room, illustrating the origin and correct use of the term vulva
Older Word, Wider Meaning

Vulva: What the Term Actually Covers — and Why It's So Often Used Wrong

In 2016 the British gynecological charity The Eve Appeal showed 1,000 women a medical drawing of the female reproductive system and asked them to place six labels on it. Forty-four percent could not identify the vagina. Sixty percent could not identify the vulva. Fewer than a third placed all six labels correctly.

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Nineteenth-century embryological teaching models arranged in sequence in a lit museum cabinet, illustrating stages of fetal development
Three signals, eight weeks

The Hormonal Cascade: How Three Signals Shape Anatomy Before Birth

At six weeks, no human embryo can be told from another. What follows is a short, strictly ordered list of hormonal instructions — one to remove a structure, one to preserve it, one to reshape it — and a set of windows so narrow that missing them by a fortnight changes the result permanently. Adrian Lowe traces the sequence, and the point where the old textbook explanation stopped being true.
Museum specimen drawer of labeled mammal penis bones with one compartment left empty, illustrating the human baculum absence
The Bone We Lost

The Baculum: Why Humans Are Among the Rare Mammals Without a Penis Bone

Open any comparative anatomy drawer and you'll find them: penis bones, sorted by species, from a weasel's hooked splinter to a walrus specimen the length of a human thigh bone. Then you reach the human tray, and it's empty. Adrian Lowe walks through what evolutionary biology has published on the…
A woman reading an open anatomy reference book at a desk in warm lamplight, illustrating a guide to female external anatomy
Beyond the Visible Tip

Female External Genital Anatomy: Every Structure Named and Explained

Ask most adults to point to the vagina on a diagram and a good number will point at the outside of the body. That is not a personal failing — it is the residue of a century of thin illustration and sparse labelling. This guide names every external structure in order, sets out the internal reach of…
Antique botanical reference book open to an oak engraving with a single dried acorn resting on the page, illustrating the Latin origin of the anatomical term glans
The Acorn in the Name

What Does 'Glans' Mean? Etymology, Definition, and What the Term Actually Covers

Two thousand years ago, someone looked at a piece of human anatomy, reached for the most ordinary object in the Latin world, and called it an acorn. The name never left. Adrian Lowe traces one small word from Roman sling bullets to the modern reference shelf — and clears up the three things almost…
Rows of plaster anatomical study casts in a museum cast court lit by an overhead skylight, illustrating documented variation in the human form
Measured, Not Imagined

Penile Curvature: What Published Studies Document About the Measured Range

The reference dataset that defines "average" was built by first removing every man whose anatomy did not conform — it says nothing at all about shape. Adrian Lowe assembles what the published literature has actually recorded about curvature and rotation: the neonatal screening figures, the nine-deg…
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Nineteenth-century human development teaching models in a lit library cabinet illustrating embryonic anatomy
One template, two outcomes

The Shared Blueprint: How One Fetal Template Becomes Male or Female

At six weeks, there is nothing to tell apart. One ridge of tissue, one small bud, two sets of plumbing — and every human body has carried them. What follows is a sequence so precisely timed that a two-week shift leaves a permanent mark, and so loosely scheduled that puberty can begin five years apa…
Four great ape skeletons — gorilla, orangutan, chimpanzee and human — displayed in a row in a natural history museum comparative anatomy hall
Four Apes, One Outlier

Why Human Genitals Are Unusual Among Primates — The Evolutionary Evidence

You've seen the chart. Four apes, one conspicuously larger, captioned with something smug. It's built on a measurement error — and correcting it opens up something far stranger. What actually makes human anatomy distinctive isn't length. It's girth, a flared glans, and two structures nearly every o…
Strength, Stability, and Function

The Suspensory Ligament: Structure, Function and Its Role in Penile Mechanics

Most men go through their entire lives without thinking about the structural engineering that makes their bodies function. We focus on muscle mass, cardiovascular output, or the visible markers of health, but the foundation of male biology often remains a mystery. When it comes to the penis, the conversation usually stops at performance or size.

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Anatomical Variation & What's Normal

Rows of plaster anatomical study casts in a museum cast court lit by an overhead skylight, illustrating documented variation in the human form
Measured, Not Imagined

Penile Curvature: What Published Studies Document About the Measured Range

In 2015, researchers at King's College London pooled measurements from up to 15,521 men to build the reference nomograms still quoted in nearly every article about penile size. Buried in the methods section is a decision that says more about anatomical shape than the results ever could: the reviewers excluded any sample containing men with a congenital or acquired penile abnormality, prior surgery, or erectile dysfunction (Veale et al., BJU International, 2015).

Male Anatomy: Structure & Function

Female Anatomy: Structure & Function

A woman reading an open anatomy reference book at a desk in warm lamplight, illustrating a guide to female external anatomy
Beyond the Visible Tip

Female External Genital Anatomy: Every Structure Named and Explained

Ask most adults to point to the vagina on a diagram and a good number will point at the outside of the body. That is not a personal failing — it is the residue of a century of thin illustration and sparse labelling. This guide names every external structure in order, sets out the internal reach of the clitoris using a 2024 meta-analysis of 21 studies, and reports what the measurement literature actually says about how widely anatomy varies between individuals. No euphemism, no diagnosis, no ranking. Just the parts, in order, with the evidence attached.

Developmental Anatomy (puberty & growth)

Nineteenth-century embryological teaching models arranged in sequence in a lit museum cabinet, illustrating stages of fetal development
Three signals, eight weeks

The Hormonal Cascade: How Three Signals Shape Anatomy Before Birth

At six weeks, no human embryo can be told from another. What follows is a short, strictly ordered list of hormonal instructions — one to remove a structure, one to preserve it, one to reshape it — and a set of windows so narrow that missing them by a fortnight changes the result permanently. Adrian…
Nineteenth-century human development teaching models in a lit library cabinet illustrating embryonic anatomy
One template, two outcomes

The Shared Blueprint: How One Fetal Template Becomes Male or Female

At six weeks, there is nothing to tell apart. One ridge of tissue, one small bud, two sets of plumbing — and every human body has carried them. What follows is a sequence so precisely timed that a two-week shift leaves a permanent mark, and so loosely scheduled that puberty can begin five years apa…

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