 The three parts of the subclavian artery and their branches. So this is the subclavian artery This is inferior belly of the omohiad that you can see it crosses the lower part of the lateral cervical region and It divides the lateral cervical region into a small lower triangle called the subclavian triangle or the omoclavicular triangle And a larger upper part which is called the occipital triangle The reason why this is called the subclavian triangle is because it contains the subclavian artery which I have picked up here So that brings me to the full distribution of the subclavian artery on the right side This is the origin of the subclavian artery from the Brachocefalic trunk subclavian artery then runs behind the scallionous anterior muscle And this is the continuation of the subclavian artery And it goes across the first trip and then becomes known as the axillary artery and when I put pulling on the axillary artery We can see it's moving here So this is the full course of the subclavian artery on the right side It's got three parts The first part is the one which is proximal to the scallionous anterior muscle from its origin at the brachocefalic trunk Till the scallionous anterior muscle Second part is behind the scallionous anterior muscle So only this much is the second part and the third part is from the lateral border of the scallionous anterior muscle It goes through the scallion triangle and it ends at the outer border of the first trip where my instrument is located So this place where my instrument is located This is the cervical axillary canal which is the canal between the clavicle and the first trip from where the Supra-clavicular region becomes continuous with the axilla and vice-versa Now let's take a look at the branches The first part of the subclavian artery has got three branches The first branch of the first part is this one which I have lifted up here This is the vertebral artery The second one is this artery that I have lifted up here This is the internal thoracic artery And the third is the this one which I have lifted up here This is the thyrosurvicar trunk Let's start with the vertebral artery again And we can see the vertebral artery in this patient is quite tortuous The vertebral artery supplies the posterior part of the brain It's the posterior circulation of the brain The vertebral artery in this neck It runs in this pyramidal space Which is bounded by laterally by the scallionous anterior muscle And medially by this muscle here This is the longest coli muscle Which is also a muscle of the pre-vertebral region So this portion of the vertebral artery is called V1 A cervical part And it disappears at the apex of a pyramidal space Then it enters into the transverse foramen of the cervical vertebra Inside the transverse foramen is called the V2 Then it enters the suboxybil region Which is the third part And then it enters the cranial cavity Which is the fourth part That is about the vertebral artery that we mentioned here Compression or occlusion of the vertebral artery Can produce posterior vertebral basilar stroke Now let's take the internal thoracic artery The internal thoracic artery enters into the thorax It runs on the side of the sternum Down like this And this gives the anterior intercostal arteries So we cannot see it any further The third branch which I picked up was this composite structure here Which is the thyrosurvicar trunk Thyrosurvicar trunk gives four branches And we can see all the four branches here Let's take them one by one This artery that we have picked up here And the other cut portion is here This is the inferior thyroid artery The first branch of the thyrosurvicar trunk It goes and it enters the lower pole of the thyroid gland The next, this one This is the transverse cervical artery And we can see when I'm putting traction here It is moving here So the transverse cervical artery runs under the internal jugular vein And it continues here And this is also in some books Referred to as the cervical dorsal artery And this divides into a superficial and a deep branch The superficial branch accompanies the spinal accessory nerve The deep branch is also referred to as the dorsal scapular artery Which runs on the back The third branch that we see here is this one here This is the suprascapular artery And we can see the other end of the suprascapular artery here And we can see it is accompanying the suprascapular vein And it is accompanying the suprascapular nerve And it is entering into the suprascapular fossa The fourth branch is this one here This is the ascending cervical So therefore the inferior thyroid and the ascending cervical Are the two terminal branches of the thyroservical trunk So we have seen the four branches of the thyroservical trunk Now let's come to the second part of the subclavian artery This is the branch from the second part This is the costoservical trunk And if we trace the costoservical trunk deeper We can see that it is dividing into two further branches One is called the deep cervical Which supplies the muscles of the neck And the other is called the supreme intercostal Which supplies the upper posterior intercostal space And finally the third part Subclavian artery usually does not have any branches Though sometimes the suprascapular artery Or the dorsal scapular artery can arise From the third part of the subclavian artery Let's mention a few clinical correlations Number one We can palpate the pulsation of the suprascapular artery here Where my finger is located And I can feel it against the first trim This is the supraclavicular pulsation of the subclavian artery The second important clinical correlation Is compression subclavian artery In the skeleton triangle here In which case the person will have a weakness Of radial pulse on that side And that is diagnosed by what is known as Adson's test Crossing in front of the subclavian artery We have this nerve here This is the vagus nerve And this will give a branch Which we have not dissected out Which will go under the subclavian artery And come to the side of the neck And that is the recurrent laryngeal nerve This can get compressed in a tumor Of the apex of the lung Called the pancoast tumor And can produce hoarseness of the voice So these are some clinical correlations pertaining to the subclavian artery 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 Anderson is the camera person Have a nice day