The dissections showed that the fascia lata (FL) attaches to the entire extent of the inferior aspect of the iliac crest. In the upper and lateral thigh, the FL receives fibrous contributions from the gluteus maximus and tensor fascia lata (TFL) to form the ITB.
Tunica media. This is the middle layer. It is made of smooth muscle and elastic fibers. It is responsible for vasodialation and vasoconstriction of the blood vessels. It is also the target tissue for Vasopressin (ADH) Hormone and plays into blood pressure. Tunica adventitia This is the most superficial of the layers.
Why does peripheral vasoconstriction happen? Peripheral vasoconstriction occurs to allow the body to retain core heat for longer as protection against hypothermia by allowing the skin to act as an insulating layer between core organs and the water. It also allows more oxygen to be delivered to important and oxygen-sensitive organs such as heart and brain.