 Hello everyone. What did we just see in this short clip? There was a person sniffing drugs from this region, right? That's why this region is also referred to as anatomical snuffbox and this is the topic for discussion today. So anatomical snuffbox I will be covering under these headings. First I will cover the location of the anatomical snuffbox and the boundaries and contents of anatomical snuffbox. These two will be seen in a 3D model and lastly I will cover the applied anatomy, okay? So let's begin with the location. So the location of anatomical snuffbox is in the region of the base of the thumb, okay? Once we extend the thumb, there will be a clear depression that will be formed here and there are certain important anatomical landmarks surrounding it and to understand the various boundaries, the muscles of the extensor compartment of the forearm, the deep muscles. There are five deep muscles, right? So out of which three muscles are coming in the boundaries of anatomical snuffbox. So these three names we should be knowing very clearly. One is the abductor polishes longus and along with it there is also one more muscle extensor polishes bravis, okay? These two muscles are seen together and there is one more muscle that is the extensor polishes longus, okay? This muscle. So these three muscles are forming the boundaries of anatomical snuffbox and these are the two other muscles in the deep extensor forearm, okay? So let's see this boundaries and contents in details in a 3D model. So here we can see a 3D dissected specimen of the hand. This region is the region of the anatomical snuffbox, okay? So how to identify the boundaries of anatomical snuffbox? Boundaries when we say there are side boundaries as well as roof and floor, okay? The roof will be formed by skin, superficial fascia and the deep fascia, okay? And superficial fascia contains cephalic vein as well as there is a branch from the radial nerve, okay? The superficial branch of the radial nerve. Then side boundaries if we see this muscle is the extensor polishes longus muscle. This is the postero medial boundary and anterolateral boundary is formed by two muscles, the abductor polishes longus and extensor polishes bravis, okay? So can we identify here? This muscle here, this is the extensor polishes bravis and this large muscle that is the abductor polishes longus, okay? In this section these two muscles are seen together and this extensor polishes longus is seen as a separate muscle, okay? That's how we can easily identify and floor of the anatomical snuffbox is formed by the bones of the carpal bones. Those bones are scaphoid and trapezium, okay? These two bones are here and the content of anatomical snuffbox here we can see a blood vessel that is the radial artery, okay? So radial artery is the chief content of anatomical snuffbox, okay? So here now we can see the labelled image of the 3D model which we saw. So what all things are seen? This number one which is mentioned that is the abductor polishes longus muscle, then this number three which is mentioned that is the extensor polishes bravis muscle, which one is this? This is the extensor polishes longus muscle, okay? And the blood vessel which is seen here that is the radial artery that is the chief content of anatomical snuffbox, okay? Then let's cover the applied anatomy of anatomical snuffbox. Since the radial artery is the chief content, the pulsations of the radial artery one can feel when we palpate in this region. Then fracture of the scaphoid bone if it occurs. So there will be tenderness in the anatomical snuffbox. Here in this x-ray we can see the fracture of the scaphoid. So whenever there is a fracture there will be tenderness in anatomical snuffbox, okay? Then cephalic vein which is present in the roof of anatomical snuffbox. Here we can see this is the cephalic vein. So there is more towards the base of the anatomical snuffbox. So it is preferred for intravenous fluids, okay? Just in case other veins are not easily accessible, then cephalic vein can be accessed here, okay? Then there is a condition called as d-quervain sinusinovitis in which the tendons of adductor policies longer as well as extensor policies bravest, okay? These two tendons get inflamed and there is pain and tenderness in the region of anatomical snuffbox, okay? And why this is called as d-quervain sinusinovitis? Any idea? Because it was first discovered by Swiss surgeon. His name is Fred D. Quervain, okay? So that's why the name is d-quervain sinusinovitis. So let's summarize what we have covered in this particular session. We covered the location of anatomical snuffbox, the various structures forming the boundaries of anatomical snuffbox. The three muscles are very important. Abductor policies long as along with extensor policies bravest and extensor policies long as is a separate muscle. Then content, chief content is the radial artery and in a plurinatomy we learnt about palpation of the radial artery, then cephalic vein for intravenous fluid, structure of the scaphoid and lastly, d-quervain sinusinovitis, okay? Thank you.