science

Urinary meatus

Urinary meatus is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Urinary meatus rather than just read about it. In short: The urinary meatus (, mee-AY-təs; pl.: meatus or meatuses), also known as the external urethral meatus or external urethral orifice, is the opening where urine exits the urethra through the penis or vulva during urination. It is also where semen exits during male ejaculation, and other fluids during female ejaculation.

Key takeaways

Urinary meatus belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Urinary meatus to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Urinary meatus from memory before moving on to harder problems.

Reference excerpt

The urinary meatus (, mee-AY-təs; pl.: meatus or meatuses), also known as the external urethral meatus or external urethral orifice, is the opening where urine exits the urethra through the penis or vulva during urination. It is also where semen exits during male ejaculation, and other fluids during female ejaculation. The meatus has varying degrees of sensitivity to touch.

In human males

The male external urethral orifice is the external opening of the urethra, normally located at the tip of the glans penis, at its junction with the frenular delta. It presents as a vertical slit, and continues longitudinally along the front aspect of the glans, which facilitates micturition. In some cases, the opening may be more rounded. This can occur naturally or may also occur as a side effect of excessive skin removal during circumcision. The meatus is a sensitive part of the male reproductive system.

In human females

The female external urethral orifice is where urine exits the urethra during urination. It is located about 2.5 cm (1 in) behind the clitoris and immediately in front of the vaginal opening in the vulval vestibule. It usually assumes the form of a short, sagittal cleft with slightly raised margins. To its left and right are the openings of the Skene's glands. Some evidence exists to suggest that the clitoral-urinary meatus distance (CUMD) in human females relates to the ease with which the female may achieve orgasm through penetrative sex. Orgasm from penetration alone is observed to be more likely as CUMD decreases. Evidence also suggests that decreased distance from the vaginal opening to the urethral meatus is associated with recurrent post-coital urinary tract infections. Surgical repositioning of the distal urethra to prevent recurrent post-coital urinary tract infections has been employed with some success by Russian physicians.

In other mammals Unlike most other mammals (including humans), female spotted hyenas and spider monkeys have a urinary meatus that is located on the clitoral glans.

Clinical significance Congenital disorders of the meatus include epispadias (the misplacement to the upper aspect) and hypospadias (the misplacement to the underside of the penis). A congenital misshaping can result in its narrowing (meatal stenosis), causing a partial or total urinary blockage or the bifurcation of the urinary stream. A urethral blockage can also be caused by foreign material, kidney stones, or bladder stones (lithiasis).

Illustrations

Worked examples

Example 1 — a first encounter with Urinary meatus

Start with the simplest possible case. Write down what Urinary meatus claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Urinary meatus before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Urinary meatus ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Urinary meatus

In research: Urinary meatus appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Urinary meatus in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Urinary meatus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Human penis, Penis, Urethra, so understanding it makes those chapters shorter.
In everyday life: Look for Urinary meatus outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Urinary meatus in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Urinary meatus means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Urinary meatus out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Urinary meatus in simple terms?

Why does Urinary meatus matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Urinary meatus?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Urinary meatus.