Veins of the diploë as displayed by the removal of the outer table of the skull.
The diploic veins are large, thin-walled valveless vessels that channel between inner and outer calvaria of the skull. They develop fully by two years after birth. The diploic veins drain this area into the dural venous sinuses. The four major types of diploic veins found on each side of the head are frontal, anterior temporal, posterior temporal, and occipital diploic veins.
Types of diploic veins
The anterior temporal, which is confined chiefly to the frontal bone, and opens into the sphenoparietal sinus and into one of the deep temporal veins, through an aperture in the great wing of the sphenoid.
The occipital, the largest of the four, which is confined to the occipital bone, and opens either externally into the occipital vein, or internally into the transverse sinus or into the confluence of the sinuses (torcular Herophili).
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