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>>> It works like this:

For legs:

Entire lower part of the leg: {’uS cha’neH}

Front of lower part of the leg (shin): {’uS reStav}

Back of the lower part of the leg (calf): {Do’ghI’}

Entire upper part of the leg (thigh): {’uS nev’ob}

Unless specificity is called for, {’uS} is generally left out of {’uS reStav} and {’uS nev’ob}; even when the context is clear, however, {’uS} is seldom if ever left out of {’uS cha’neH}.

{’uS} tends to be used with {Do’ghI’} only if a distinction or comparison is being made with {DeS Do’ghI’} (see below).

For arms:

Entire lower part of the arm (forearm): {cha’neH}

Outer part of the forearm (extending from the back of the hand to outer part of the elbow): {DeS reStav}

Inner part of the forearm (extending from the palm to the elbow pit [{DeS tutren}]): {DeS Do’ghI’}

Entire upper part of the arm: {DeS nev’ob}

Unless specificity is called for, {DeS} is generally left out of  {DeS reStav} and {DeS nev’ob}; even when the context is clear, however, {DeS} is seldom if ever left out of {DeS Do’ghI’}.

{DeS} tends to be used with {cha’neH} only if a distinction or comparison is being made with {’uS cha’neH}.

Glossing {reStav} as “forearm” is a result of a mismatch between English and Klingon. Since English has no everyday word corresponding to either {DeS reStav} or {DeS Do’ghI’}, in a nontechnical conversation, these would both probably be translated into English as simply “forearm.” If one pointed to one’s {DeS reStav} and asked “what is this called in English?” the most likely answer would be “forearm.” Likewise for {DeS Do’ghI’}. The specificity is in Klingon only.