Category: I

Within the heart.  

Within the envelope containing a part, organ, or organism. Inside a capsule, typically referring to the capsular ligament of a joint.  

Within a small anatomic canal.  

Within a breathing tube.  

Within the ear.  

Within a small chamber of the heart (atrium). Inside an atrium, which is one of the heart’s two upper chambers.    

Within a joint.  

Within an artery. A type of injection made directly into an artery, such as one that supplies a tumor. Given into a patient’s artery (for example, via a needle). For some purposes, the injection is given into a vein rather than an artery, and is then “intravenous (IV).” The injection may be made for the…

Within the appendix.  

Within the smallest division of a gland.