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Subclavian artery Anatomy : Origin, Course, Parts, Branches, Relations and Clinical anatomy
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Subclavian artery Anatomy : Origin, Course, Parts, Branches, Relations and Clinical anatomy

Anatomy of the Subclavian Artery

Overview of the Subclavian Arteries

  • The subclavian arteries are located beneath the clavicles, with one on the left and one on the right. They serve as major arteries in the thoracic region.

Transition to Axillary Artery

  • The subclavian artery transitions into the axillary artery at the lateral border of the first rib, marking its terminal portion. This transition signifies that it is a primary source for upper limb arterial supply.

Development of Subclavian Artery

  • The right subclavian artery arises from both the fourth aortic arch and the right seventh intersegmental artery, while the left subclavian artery develops from just the left seventh intersegmental artery. Understanding this development is crucial for grasping its anatomical significance.

Course of Right and Left Subclavian Arteries

  • The right subclavian originates from the brachiocephalic trunk and runs above the clavicle before reaching its terminal point at the first rib. In contrast, most individuals have their left subclavian arise independently from the aortic arch below other branches like common carotid arteries.

Parts of Subclavian Artery

  • Each subclavian artery is divided into three parts based on its relation to anterior scalene muscle:
  • First Part: Medial to anterior scalene; gives off vertebral, internal thoracic, and thyroid cervical trunk branches.
  • Second Part: Posterior to anterior scalene; gives rise to costo-cervical trunk.

Subclavian Artery and Clinical Anatomy

Overview of the Subclavian Artery

  • The dorsal scapular artery is a significant branch of the third part of the subclavian artery, which lies on the first rib and is superficial, allowing for palpable pulsations with deep pressure.
  • The omoclavicular triangle (or supraclavicular triangle) contains the third part of the subclavian artery; applying pressure here can help identify its pulsations.

Brachial Plexus Relations

  • The inferior trunk of the brachial plexus is located directly posterior to this section of the subclavian artery, highlighting important anatomical relationships.
  • While typically arising from the first part via the thyrocervical trunk, the suprascapular artery may occasionally originate from the third part of the subclavian artery.

Subclavian Steel Syndrome

  • This syndrome occurs when there is narrowing or occlusion in the proximal subclavian artery (often due to atherosclerosis), leading to reduced blood supply to one arm and potential reversal of flow in an affected vertebral artery.
  • Symptoms are often asymptomatic but can include limb pain, fatigue, paresthesia, cold skin, dizziness, or syncopeβ€”especially in cases with cerebrovascular lesions.

Diagnostic Indicators

  • A key diagnostic sign for subclavian steel syndrome is a discrepancy in blood pressure between arms greater than 15 mmHg due to decreased pressure on the affected side compared to contralateral measurements.
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πŸ“Œπ…π¨π₯π₯𝐨𝐰 𝐨𝐧 𝐈𝐧𝐬𝐭𝐚𝐠𝐫𝐚𝐦 :- https://www.instagram.com/drgbhanuprakash Subclavian artery Anatomy : Origin, Course, Parts, Branches, Relations and Clinical anatomy Branches of the Subclavian Artery ------------------------------------------------------ The left and right subclavian arteries are located in the thorax (chest) underneath the clavicles (commonly known as the collarbones). The left subclavian artery receives oxygenated blood from the aortic arch (the top portion of the largest artery in the body that carries blood away from the heart). The right subclavian artery receives blood from the brachiocephalic branch. The Left Subclavian Artery ------------------------------------------ Branches off directly from the arch of the aorta (as it travels down to supply oxygenated blood to the upper body) Passes between the anterior and middle scalene muscles (located in the neck) Ends at the outer border of the first rib where it becomes the axillary artery, which supplies blood to the axillary (armpit area) region of the body. The axillary artery continues down the arm to become the ulnar and radial arteries (supplying oxygenated blood to the arm). The Right Subclavian Artery --------------------------------------------- Arises from the brachiocephalic trunk (the second branch to arise from the aorta) Travels posteriorly (behind) the sternoclavicular joint (the area where the clavicle [collarbone] and the sternum [breastbone] come together). Becomes the axillary artery once it passes the first rib. The axillary artery supplies blood to the axillary region of the body; it extends down the arm to become the ulnar and radial arteries (supplying oxygenated blood to the arm). #subclavianartery #arteriesofupperlimb #upperlimbbloodsupply #usmle #usmlestep1 #mbbs #nationalexittest #nationalexitexam #mbbsfirstyear #anatomy #upperlimbanatomy