Leg
Reed's leg being treated
A leg was a lower extremity of a humanoid lifeform.
In 2151, Lieutenant Malcolm Reed suffered from an injury in his left leg. The bullet of the Novan projectile weapon still stuck inside and he lost a bit of blood. Reed placed a bandage over the wound. Similar, the Novan Akary broke his leg when hit by a trunk inside an underground well. (ENT: "Terra Nova")
In 2152, Malcolm Reed endured a leg injury while attempting to disarm a Romulan mine which had attached to the outer hull of Enterprise NX-01. Doctor Phlox began physical therapy to restore the use of Reed's leg. Shortly after, Reed's leg was restored to full health during the ship's encounter at the automated repair station. (ENT: "Minefield", "Dead Stop")
Assuming her to be responsible for an act of sabotage committed aboard the Sarcophagus by Michael Burnham, Kol ordered that L'Rell be found and her legs cut off, intending to deal with her after destroying Pahvo. Ultimately, L'Rell was captured by Starfleet personnel and the Sarcophagus was destroyed with all hands before the order could be carried out. (DIS: "Into the Forest I Go")
Worf observed that Vash had "nice legs... for a Human." (TNG: "Qpid")
In 2374, the crew of the USS Voyager were forced into an illusory scenario in which they were living in the time of Nazi Germany. Eventually, several of them were freed of the controls that had caused them to believe they were, in fact, individuals within the scenario. Harry Kim, who had been freed, encountered his friend Tom Paris and addressed him as such, but Paris remained under the program's control, believing himself to be an American soldier. He questioned what Kim was doing as a civilian in the middle of a war zone and when Kim hesitated, told him her didn't have time for a game of twenty questions. He said that if he was an American to tell him if Betty Grable came around the corner what part of her he would be staring at. After another hesitation, Kim replied that he would be looking at her legs and Paris lowered his gun, telling him it was lucky for him. (VOY: "The Killing Game, Part II")
During the siege of AR-558, Nog lost his leg during an intense firefight with Jem'Hadar soldiers. It was replaced with a biosynthetic leg. (DS9: "The Siege of AR-558")