What human body parts starts with letter O?

One human body part that starts with the letter "O" is the occipital lobe, which is a region in the brain responsible for visual processing. Another body part is the ovaries, which are part of the female reproductive system and produce eggs. Additionally, the oesophagus, also known as the esophagus, is a muscular tube that connects the throat to the stomach, allowing for the passage of food during digestion.