Gingiva covering the lingual surfaces of the teeth.  

Gingiva covering the labial surfaces of the teeth.  

Any toxic or noxious gas that causes irritation or inflammation of the airways or alveoli.  

One of the ganglia usually occurring in fours in the lumbar portion of the sympathetic trunk.  

A fracture of the calcaneus, due to jumping from a height (e.g., a balcony or second-story window).  

A fracture in which the bone is compressed and bent so that one side of the fracture bulges and the...

The depression in the anterior surface of the vitreous for reception of the crystalline lens.  

The hollow of the frontal bone that holds the lacrimal gland.  

A small opening on the lingual surface of the mandible at the midline. It is surrounded by small bony protuberances...

The opening bounded by the hip bone, sacrum, and sacrospinous ligament.