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What is In obstruction of second part of axillay artery, the anostomosis between the following artery will maintain the blood supply of upper limb: and explain in detail?
Ans. is 'a' i.e. Deep branch of transverse cervical artery & subscapular artery Axillary artery is the continuation of the subclavian artery. It is crossed by pectoralis minor muscle which divides it into three parts.A rich anastomosis exists around the scapula between branches of subclavian artery (first part) & the axillary artery (third part).This anastomosis provides a collateral circulation through which blood can flow to the limb when the distal part of subclavian artery or theproximal part of axillary artery is blocked. Anastomosis around the scapula :Formed by branches of- * Subclavian artery - first partSuprascapular arteryDeep branch of transverse cervical artery *Axillary artery - third partSubscapular artery & its circumflex scapular branchThere are other smaller anastomoses over the acromion process, which also helps to maintain flow to arm. (BDC Vol 1, 4/e, p 82) Anastomoses over the acromion process: Formed by -Acromial br. of thoraco-acromial arteryAcromial br. of suprascapular arteryAcromial br. of posterior circumflex humeral arteryThe subscapular artery also forms anastomoses with intercostal arteries.