system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
In a Subclan aery block at the outer border of 1st rib, all of the following aeries help in maintaining the circulation to upper limb except
assistant
The correct answer is  In distal subclan & proximal axillary aery block aerial anastomosis exists between 1st pa of SCA&3RD pa OF axillary aery Ref: Gray's 40e/p447-451