 There's a supine cadaver on the right side. So we have abducted the right arm and we can see the contents of the axillary. This is the lateral boundary. This is the medial boundary of the axillary force. Straight away in front of us we can see the structure here. This is the axillary vein. And we can see the axillary vein is formed by the union of the v-neck comitantes of the brachial artery and the basalic vein, which continues up as the axillary vein. And we can also see that the axillary vein is receiving this big vein here. This is the cephalic vein. This cephalic vein pierces through the cluster coronary and it opens into the axillary vein. We have this structure here, which I have lifted up. This is the axillary artery. As we know, the axillary artery has got three parts. The first part is from the outer board of the first strip to the pectoralis minor, which has been reflected here. The second part is behind the pectoralis minor. And the third part is from the pectoralis minor to the teres major. This is the teres major. So this is where the axillary artery ends and after that it becomes the brachial artery. The first part has got one branch and we can see the first branch here. I have lifted it up here. This is the superior thoracic artery. It supplies the upper part of the chest board. Now let's come to the second part of the axillary artery. The portion which is behind the pectoralis minor. We can see this branch here. It is running on the surface of the chest board. This one. And it is running on top of the serratus anterior and it is accompanied by this nerve here. This is the lateral thoracic artery and the accompanying nerve is the long thoracic nerve or belly. It runs on the surface of the lateral side of the chest board and this is the one which also gives lateral mammary branches to the female breast. Then we have the thoracoachromial artery and that is this one here. The thoracocromial artery also pierces through the costocoropoid membrane which was pierced by the same cephalic vein and the thoracocromial artery after it pierces through the costocoropoid membrane it gives four branches. A clavicular branch, deltoid branch, a pectoral branch and an acromial branch. Those branches we cannot see here. Now we are in the third part of the axillary artery. This is the third part and we can see three branches. This is the anterior circumflex humeral artery. This is the exterior circumflex humeral artery and this branch, big branch that we see here, this is the last branch of the third part and that is called the subscapular artery. The subscapular artery runs medially and it divides into a circumflex scapular which runs through the triangular space and it also forms a peripodorsal artery which runs on this muscle here that's the lacymus dorsum. And thereafter, after the lower border of the t-rease major axillary artery becomes known as the brachial artery. Now we are going to demonstrate chords of the brachial plexus and the terminal branches. As you know, the roots and the bones of the brachial plexus are not visible here because they are present in the neck. The divisions of the brachial plexus are in the cervical axillary canal which is also not visible here. What we can see in the axillary are the chords of the brachial plexus and the terminal branches. So, let's identify the chords of the brachial plexus. This is the lateral chord of the brachial plexus. It is called lateral chord because it is situated lateral to the axillary artery and this is the one which is situated behind the pectoralis minor which has been reflected here. Then we have this one. This is the medial chord of the brachial plexus because it is located medial to the axillary artery and we have this chord here which is the posterior chord. Now let's take a look at the terminal branches. Terminal branches are strictly speaking not part of the brachial plexus. They are out of the brachial plexus. Arising from the lateral chord we have this nerve here. This is the muscular cutaneous nerve and we know the muscular cutaneous nerve disappears under the attachment insertion of the coracobrachialis muscle which is here and thereafter it supplies the coracobrachialis the biceps and the brachialis. This is the lateral root of the median nerve which is also arising from the lateral chord of the brachial plexus. Now let's take a look at the medial chord of the brachial plexus. We can see this is the medial root of the median nerve. The lateral root of the median nerve and the medial root of the median nerve the two of them united from the median nerve which I have lifted up here and the median nerve accompanies the brachial plexus and then we have the rest of the medial chord which is continuing down. This is the ulnar nerve and also arising from the medial chord we have this one. This is the medial cutaneous nerve of the arm and the medial cutaneous nerve of the forearm. Now we have retracted all the structures to show the posterior chord of the brachial plexus and I'm removing some of the fascia here to show the posterior chord even more clearly. This is the posterior chord which I have lifted up and you can see the posterior chord is very big. The posterior chord gives rise to two major branches. This one is the first one. This is the axillary nerve. The axillary nerve goes through the quadrangular space accompanied by the posterior circumflexumeral artery which is this one and it supplies the deltoid muscle and the d-least minor and thereafter it pierces the deltoid muscle and becomes cutaneous. Inferior dislocation of the shoulder joint axillary nerve can be injured. The rest of the posterior chord continues as the radian nerve and we can see this as the radian nerve here. We can see it through the triangular interval and it disappears behind the humerus through the radial groove and it supplies the structures in the posterior aspect. So therefore we have seen the lateral chord of the brachial plexus, the muscular cutaneous nerve, the lateral root of the medial nerve, the medial root of the medial nerve coming the medial nerve. Then we have seen ulnar nerve, the medial cutaneous nerve, the arm of the forearm, the posterior chord of the brachial plexus, the axillary nerve and the radial nerve. Finally before we conclude this is the composite fat and the lymph nodes that we have descended out from the axillary. These are the lymph nodes which are present at the axillary and if we feel them we can feel the ligates of lymph nodes. The lymph nodes are divided into a pectoral group which are in relation to the pectoralis major muscle, a sub-scabular group which are in relation to the leximus dorsi and the delis major. Then we have the humeral group which are in relation to the humerus. All of these drain into the central group of lymph nodes which are located behind the pectoralis minor. From there they go to the apical group of lymph nodes and from the apical group or the infraclavic group they go to the supraclavic group. So these are the complete list of contents of the axillary that we can see here. That's all for now. Thank you very much for watching. Please like and subscribe. Dr. Sanjay Sanyal signing out. If you have any questions or comments please put them in the comment section below. Have a nice day.