 I have decided to do a quick video to show you the contents of the carpal tunnel and here you see me dissecting out the carpal tunnel by insizing the flexor and anagulum. Okay. Good day everybody. Welcome to our next dissection. This dissection essentially focuses on the carpal tunnel and the structures passing through the carpal tunnel. So what we have done, we have first of all removed the palmar aponeurosis from here, which is actually we had already started removing it from the previous dissection. Now we have more completely removed the palmar aponeurosis from here. Secondly, we have sliced open the flexor retinaculum and you can see one cut edge of the flexor retinaculum here and you can see the other cut edge of the flexor retinaculum here and you can see the palmaris along the standard is still attached to the flexor retinaculum here. Okay. Having cut open the flexor retinaculum, we have opened up the carpal tunnel and this is the carpal tunnel. So let's see what are the structures which passes through the carpal tunnel and which cause what is known as the carpal tunnel syndrome. Straight away we can see these tendons here. These are the tendons which are the tendons of the flexor digitalum superficialis. The flexor digitalum superficialis and I am lifting them up. And under the tendons of the flexor digitalum superficialis, we have the tendons of the flexor digitalum profundus. In life, all of these were enclosed in a common sanomial sheath which was intended from the radial side and that came to be that was known as the allanar bursa. Apart from this structure and you can see the contents, this is the carpal tunnel which is now exposed now that I have lifted up these tendons. What else do we see going through the carpal tunnel? We can see this additional tendon also going through the carpal tunnel, this one here, this one here, this structure. This is the flexor policies longest tendon. This also goes through the carpal tunnel and this has got its own sanomial sheath which is known as the allanar bursa. Just to bring you up to speed, this structure that we see here is the flexor carpal radialis and on the other side, this structure that we see is the flexor carpal allanaris but that is not part of the carpal tunnel. Having seen all that, let's look at the most important structure which passes through the carpal tunnel and which is labelled to be compressed and that is this structure here. This is the median nerve. The median nerve is the location of the median nerve on the near the wrist joint is between the tendons of the flexor carpal radialis and the palmaris longus. So when the carpal tunnel was located, was intact, this was the location of the palmaris longus and the median nerve was between the palmaris longus and the flexor carpal radialis. Now that the palmaris longus tendon has moved away, this is the most important structure which gets compromised in carpal tunnel syndrome and that is the median nerve. And we can see the median nerve goes under the carpal tunnel, through the carpal tunnel, under the flexor at necrolum and we can see it is dividing into several branches and which are supplying the structures in the palm. Notably which has been partially removed from here, this is one of the recurrent branches of the median nerve which supplies the muscles of the tinar eminence. So that is what we can see in the carpal tunnel. So the four tendons of the superficialis, the four tendons of the profundus, the flexor policies longus and the median nerve, these are the contents of the carpal tunnel and this is the carpal tunnel left exposed here. Additionally, I wanted to show you the space of parona. It is bounded by the pronator quadratus muscle posteriorly, the flexor digital and profundus anteriorly, the flexor policies longus laterally and the flexor carpal ulnaris medially. This space of parona communicates distally with the mid-palmar space and any infections of the mid-palmar space like a mid-palmar abscess can track through the carpal tunnel into the space of parona. Similarly, separated tinosinovitis of any of these tendons can rupture into the space of parona. So therefore this is a clinically important space. This is the space of parona. Thank you ladies and gentlemen. Thank you for watching and have a nice day. If you have any questions or comments, put them in the comment section below. Dr. Sanjay Sanyal signing out.