Brachial Artery vs Radial Artery
Brachial Artery vs Radial Artery
The brachial artery of the arm continues as the radial and ulnar arteries in the forearm. Understanding their courses and clinical applications is essential for blood pressure measurement, arterial access, and recognizing vascular emergencies.
Comparison Table
Key Differences
- →Brachial is in the arm, radial is in the forearm (after bifurcation)
- →Brachial pulse for BP measurement; radial pulse for heart rate
- →Radial artery is preferred for arterial access due to superficial course and collateral circulation
- →Brachial artery injury (supracondylar fracture) can cause Volkmann's ischemic contracture
Clinical Relevance
- •Allen's test: Checks collateral circulation via ulnar artery before radial artery cannulation
- •Radial artery is preferred for arterial lines because of dual blood supply to hand
- •Brachial artery injury from supracondylar fractures is an emergency
- •Both arteries can be used for cardiac catheterization (radial approach increasingly common)
Study Tips
- ✓Brachial = Arm (Brachium), Radial = Forearm (near Radius)
- ✓Allen's test: Compress both arteries, release ulnar, hand should pink up within 5-10 seconds
- ✓Remember the cubital fossa contents lateral to medial: Radial nerve, Biceps tendon, Brachial artery, Median nerve
- ✓The radial artery crosses through the anatomical snuffbox to enter the palm
FAQs
Common questions about this comparison
The radial artery is superficial and easily compressed against the radius, making cannulation easier and safer. More importantly, the hand has dual blood supply from radial and ulnar arteries via the palmar arches. If radial artery thrombosis occurs, the ulnar artery can maintain hand perfusion.
The radial artery crosses the floor of the anatomical snuffbox before entering the hand. This superficial position makes it useful for pulse palpation and accessing the artery. It also means the artery can be injured with scaphoid fractures or during surgical procedures in this region.