Category: I

Within the innermost of three membranes lining the brain and spinal cord.  

Within the tissue forming the sac containing the heart. Inside the pericardium, the protective sac that encases the heart.  

Within the pelvis.  

During birth.  

Within the functioning elements of an organ.  

Within the ovary.  

Within the orbit of the eye.    

Within the mouth.  

During birth.  

Within the nostrils.