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Medical nomenclature is needlessly complex

Reflex Hammer
Education
May 31, 2013
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Try your hand at a question from one of our anatomy exams.

What nerve supplies the obturator internus muscle (a muscle in the pelvis)?

The correct answer is the “nerve to obturator internus.” It’s like answering who is buried in Grant’s Tomb.

As a time-strapped medical student, it feels like a godsend when a medical term is named in an obvious way. Even a lay person can intuit the meaning of medical terms like “urinary tract infection,” “vocal cord paralysis,” and “foot drop.” Unfortunately, the meanings of medical terms are rarely so obvious.

Sometimes I can decipher the meaning of a medical term by looking at its Latin or Greek roots. Nephrectomy, the surgical removal of a kidney, is a combination of nephro-, from the Greek root for kidney, and -ectomy, from the Greek root for surgical excision. By knowing roots like these, I can decipher the meaning of a new term.

Thus, a ureterectomy is the surgical removal of a ureter. A nephroureterectomy is the surgical removal of a kidney and a ureter. An appendectomy is the surgical removal of the appendix. Similarly, I can tell from its name that the supraclavicular artery runs above the clavicle, and that the ovarian artery supplies the ovary. It’s fantastic.

But even this approach can run me into trouble. In 1806, a dermatologist named a particular skin disease mycosis fungoides, from the roots for mushroom and fungus, because it looks like a fungal infection. We now know that it is a type of lymphoma, with nothing to do with fungus or infection. But the name has stuck. Similar examples abound.

Often a medical term has no connection its meaning. Sometimes this is because the disease is named after its discoverer. Berger’s disease affects the kidney, while Buerger’s disease affects the small arteries of smokers.

The worst offenders are when medical terms are simply numbered in the order of their discovery. Our white blood cells have a category of proteins on their surface called cluster of differentiation. The various proteins have been numbered from CD1 up to CD350. For some CD proteins, we need to have memorized which subcategories of cell types express them.  For example:

CD3: T-cell
CD4: helper T-cell (depleted in AIDS)
CD8: killer T-cell
CD15: Reed-Sternberg cell (seen in certain leukemias)
CD30: Reed-Sternberg cell
CD56: natural killer cell

Exams like our national boards are chock-full of questions that test whether you realize that lupus anticoagulant is erroneously named, or that IL5 stimulates allergic reactions while IL10 tamps them down. Memorizing all of this takes a lot of time.

I maintain that time spent memorizing these silly names is time not spent learning other things, like how to heal patients. Medical nomenclature is needlessly complex. We should try to make our names for things easier to decipher.

“Reflex Hammer” is a medical student who blogs at The Reflex Hammer.

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