What is the persistent remnant of axial aery of upper limb ?
**Core Concept**
The axillary artery is a continuation of the subclavian artery that supplies blood to the upper limb. During embryonic development, the axillary artery forms from the distal part of the subclavian artery, leaving behind a persistent remnant.
**Why the Correct Answer is Right**
The persistent remnant of the axillary artery is the **ligamentum arteriosum**. During embryonic development, the ductus arteriosus connects the pulmonary artery to the aortic arch, allowing blood to bypass the lungs during fetal development. After birth, the ductus arteriosus typically closes, but in some cases, it remains patent and forms the ligamentum arteriosum. However, in the context of the upper limb, the persistent remnant is actually the **ligament of Bockenheimer**, also known as the **ligamentum venosum of Bockenheimer**, which is a fibrous remnant of the proximal part of the subclavian artery.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the question.
* **Option B:** This option is incorrect because it is not the persistent remnant of the axillary artery.
* **Option C:** This option is incorrect because it is a different anatomical structure.
**Clinical Pearl / High-Yield Fact**
The ligamentum venosum of Bockenheimer is a fibrous remnant that can sometimes be mistaken for a thrombosed axillary vein, leading to unnecessary surgical intervention.
**Correct Answer: C. Ligamentum venosum of Bockenheimer**