The knee joint receives its innervation from at least 7 nerves that we know of. This innervation is described here in detail, which will explain why certain popular blocks for knee surgery is worse than useless.
According to Hilton’s Law of Anatomy, all the nerves that innervate muscles that move a joint also innervate that joint. That makes total analgesia of the hip joint challenging, but, if the innervation of the hip joint as described her is understood, it becomes less of a challenge.
The eye socket is not merely a cavity, which, when filled up with local anesthetic agent constitutes an eye block. This tutorial takes an in depth look at the nerves that innervate different parts of the eye and also the barriers that separate them.
For this month of December we will continue with our theme of micro-anatomy of nerves but emphasize the very related topic of why continuous peripheral nerve blocks (CPNB) fail. Secondary block failure is a very prevalent issue and, IMHO, one of the main reasons why CPNB’s have been decreasing in popularity.