The phrase "left lobe" refers to a part of the brain called the left hemisphere. This is one of the two halves of the brain, and the left lobe controls functions like language, logic, and math skills. Full definition
It lies in the abdomen and has a right and left lobe along with a small central body. (dog-health-guide.org)
He sports an earring in his left lobe and wraparound sunglasses atop his thinning corona of dark hair, but his casual demeanor belies his relentless drive to create the world's most ambitious water information and accounting system. (discovermagazine.com)
The lump / cycst, made it difficult to get through all my sessions and classes without head, neck, ear pain so, I opted to have surgery to have the left lobe of my thyroid removed. (healthylivinghowto.com)