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.
Vasoconstriction. 1  There are muscles around all the major arteries of our body that automatically constrict or relax in order to decrease or increase blood flow. This allows the body to send more blood and warmth to the critical organs of your body (like the heart, lungs and brain), temporarily decreasing the blood flow to your hands and feet. Cold hand diseases that occur from vasoconstriction happen when these muscles apply pressure to the arteries for too long, which decreases blood flow.