Final answer:
The cranial meninges include three layers, of which the dura mater is the outermost and consists of dense irregular connective tissue in two layers.
Step-by-step explanation:
The cranial meninges consist of three layers: the dura mater, arachnoid mater, and pia mater. The dura mater is the outermost layer and it is made up of dense irregular connective tissue in two layers. It is a tough protective sheath that covers the entire brain and spinal cord, anchored to the inner surface of the skull and vertebral column. Thus, the layer made of dense irregular connective tissue in two layers is the dura mater.