 Now, let's take a look at the next component of this demonstration. These four tendons flexor-digitum superficialis and these four tendons flexor-digitum profundus. Once they go through the copper dilil, the tendons spread out because they have to go to the medial four digits and they occupy a space just under the palmar aponeurosis and that space is called the central compartment. And in this central compartment apart from these eight tendons, there will also be one one lumbrical muscle associated with the flexor-digitum profundus. So there will be totally 12 muscular and tendinous structures in the central compartment. And just under the central compartment is a space, a potential space, which is known as the mid palmar space. Let's now trace the mid palmar space. So I put my finger inside the copper tunnel and I put my finger deep inside the palm and my finger is now in the mid palmar space and the mid palmar space is the potential space which is behind the eight tendons of the flexors of the hand and the four lumbricals. And this mid palmar space, if we trace it again through the copper tunnel where my finger is tracing, it comes to the approximate part of the race and it is here. This muscle that we can see here is the pronator quadratus. And this space between the flexor-digitum profundus and the pronator quadratus which I have shown here, this space is referred to as the space of parona. So this again has got a clinical significance. If there is any infection of the mid palmar space, then infection can travel through the copper tunnel and it can spread to the space of parona. And in which case, we will have to drain the pus by making an incision on the ulnar side of the hand where my finger is tracing and we have to drain the pus from the ulnar side because the radial artery is on the radial side. So these are some of the important points which I want to mention about the central compartment mid palmar space and the space of parona. I just wanted to show you two other structures. This is the radial artery. Radial artery travels under cover of the brachioratialis and we can see the radial artery is giving a palmar carpal branch. This palmar carpal branch supplies the carpal bones and then the main radial artery curves laterally and it goes under the tendons of the anatomica snub box and it enters into the snub box. And from here, it winds around and it pierces through the first dorsal intraceous and then it comes back to the palm as the deep palmar arch. These are the thinner eminence in the thinner muscles. The next structure which I wanted to show you was on the ulnar side and we can see this tendon which I have picked up here, this one. This is the flexor carbide ulnaris. The flexor carbide ulnaris gets attached to the pc-pomb bone. So therefore the pc-pomb bone can be considered as a sesamoid bone within the tendon of the flexor carbide ulnaris. And from here, there's this ligament goes to the hook of hammet called the pisohammet ligament. Under cover of the flexor carbide ulnaris, we have these two neurovascular structures which I have lifted up here. This is the ulnar nerve and this is the ulnar artery. The ulnar nerve comes from the farm. It goes behind the medial epicondyle and if I put my finger, it goes into a tunnel called the cubital tunnel and then it comes. And the ulnar artery comes from the cubital fossa and this is the ulnar artery. And when I exert traction here, we can see it's moving there. Ulnar nerve can get entrapped in the cubital tunnel and as it travels distally under cover of the flexor carbide ulnaris, it can also get entrapped under the pisohammet ligament. This space under the pisohammet ligament is called the guion canal or the guion tunnel. So we can have a cubital tunnel syndrome in the elbow and we can have a guion tunnel or guion canal syndrome in the wrist both pertaining to the ulnar nerve. This muscle that we see here on the ulnar side, these are the hypothenar muscles which are all supplied by the ulnar nerve. The point to be remembered is that the ulnar nerve and the ulnar artery do not pass through the cubital tunnel, they pass outside the cubital tunnel. So therefore they are not entrapped in cubital tunnel syndrome. That's all for now. Thank you very much for watching. If you have any questions or comments, please put them in the comment section below. Dr. Sanjay Sanyal signing out. Have a nice day.