Kruro or gambo, ventro or stomako: precise body words

Inside, and what it is made of

• La sango fluas tra la vejnoj al la koro. - The blood flows through the veins to the heart.

Three fences

Three pairs where English has one word, or Esperanto has two that look alike.

• kruroa leg
• femurothe thigh
• ventrothe belly
• stomakothe stomach, the organ

Kruro and gambo. Both mean leg. ReVo notes that Zamenhof used kruro almost always for the whole limb, and that in anatomy it can also mean only the part from the knee to the foot. Gambo is always the whole limb, and ReVo lists it as a synonym of kruro:

• Miaj kruroj estas lacaj. - My legs are tired.
• Miaj gamboj estas lacaj. - My legs are tired.

Ventro and stomako. ReVo defines ventro as the part of the body between the chest and the pelvis, and stomako as the organ where digestion begins:

• Li batis min en la ventron. - He hit me in the stomach.

Senco and senso. The five senses are sensoj; the meaning of a word is its senco. So sensenca (without meaning) means meaningless:

• Tio estas sensenca. - That is meaningless.

False friends has more pairs like this.

The body in idiom

All of these are in ReVo, and most of them take la rather than a possessive:

Two proverbs:

• Kiom da kapoj, tiom da opinioj. - So many heads, so many opinions.
• For de l' okuloj, for de la koro. - Out of sight, out of mind.

De l' okuloj is de la okuloj with the article shortened, which Rule 16 allows.