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.
What is vasoconstriction? It is the narrowing of the blood vessels as the muscular walls of the vessels contract. Vasoconstriction and vasodilation are two different things, although a lot of people used them interchangeably. Vasodilation is the widening of the blood vessels. It is the opposite of vasoconstriction. It is useful in many circumstances.