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How many things are there of 45 cm in anatomy One is spinal cord one is femur bone then rest which structures

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structures measuring 45 cm in human body anatomy mnemonic vas deferens thoracic duct spinal cord femur

Besides the spinal cord and femur, the other structures classically cited as measuring around 45 cm (18 inches) in the human body are:
  1. Thoracic duct - the main lymphatic trunk, running from the cisterna chyli (around L1-L2) up to the junction of the left subclavian and internal jugular veins. It is usually quoted as 38-45 cm long.
  2. Vas deferens (ductus deferens) - the paired muscular tube carrying sperm from the epididymis to the ejaculatory duct, classically taught as about 45 cm long.
  3. Transverse colon - the segment of colon crossing the abdomen from the hepatic (right colic) flexure to the splenic (left colic) flexure, also commonly cited at roughly 45 cm (though this is more variable than the others).
  4. Femur - specifically noted as 45 cm in a person who is about 6 feet tall, since femur length scales with height (it's the longest bone, but the exact 45 cm figure is tied to that height).
So the commonly taught "45 cm" list is:
  • Spinal cord
  • Femur (in a ~6 ft tall person)
  • Thoracic duct
  • Vas deferens
  • Transverse colon (sometimes included, less consistently)
This is a popular anatomy exam trivia grouping rather than a formal physiological category, so exact lengths vary somewhat between textbooks and individual variation in body size.

From which book did this content is of

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I should be upfront about the source: this isn't from a single dedicated textbook in the library. I checked, and no textbook in the medical library has this exact "45 cm structures" list as a discrete passage (a targeted search for "vas deferens" + "thoracic duct" together returned no matches in the library).
The list I gave you came from a widely circulated anatomy trivia/mnemonic compilation commonly seen on medical education sites (e.g., a post on medizzy.com listing "structures that measure 45 cm/18 inches") and general anatomy mnemonic references (like Oxford Medical Education's mnemonics page and Wikipedia's list of anatomy mnemonics). It's a popular exam-revision list rather than content lifted verbatim from one specific textbook - the individual facts (spinal cord ~45 cm, femur, thoracic duct 38-45 cm, vas deferens ~45 cm, transverse colon) are standard figures found scattered across standard anatomy texts (e.g., Gray's Anatomy, Snell's Clinical Anatomy), but no single indexed book in this library presents them together as one "45 cm list."
If you want, I can search the library for each individual structure's length (e.g., vas deferens length in a specific anatomy textbook) to give you a proper page citation for each fact.
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