The subdermal plexus forms the vascular basis for –
**Core Concept**
The subdermal plexus, also known as the superficial venous plexus, is a network of small veins located just beneath the skin's surface. It plays a crucial role in the venous drainage of the skin and underlying tissues.
**Why the Correct Answer is Right**
The subdermal plexus is formed by the terminal branches of the cutaneous veins, which drain into the deeper venous system, including the great saphenous and small saphenous veins. This plexus is particularly important in the return of blood from the skin to the heart, especially in the lower limbs. The subdermal plexus is also involved in the development of varicose veins and other superficial venous disorders.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because the subdermal plexus is not primarily involved in the lymphatic drainage of the skin.
**Option B:** Incorrect because the subdermal plexus is not a part of the arterial system.
**Option C:** Incorrect because the subdermal plexus is not responsible for the regulation of body temperature.
**Clinical Pearl / High-Yield Fact**
The subdermal plexus can become compromised in conditions such as chronic venous insufficiency, leading to a range of clinical manifestations, including varicose veins, eczema, and ulcers.
**Correct Answer: C. Subdermal plexus forms the vascular basis for the venous drainage of the skin.**