Lymphatics on the side of the skull extend along the TS towards the top of the skull. (A) Schematic of blood vessels in the dura mater at the side of the skull. The MMA, TS, RGV, and SS are shown. The purple area around the TS is analyzed at different developmental time points as shown in (B–D), and the multiple open arrows in (B–D) indicate the TS and SS. (B) At P11, Prox1-GFP-positive/LYVE-1-weak lymphatic vessels exist along the SS and at the base of the TS (arrows). (C) At P13, Prox1-GFP/LYVE-1-double positive lymphatic vessels along the TS (arrows) extend towards the top of the skull. Prox1-GFP/LYVE-1-double positive lymphatic vessels from the SS extend upwards and connect with the lymphatic vessels along the TS. (C) At P20, Prox1-GFP/LYVE-1-double positive lymphatic vessels exist along the entire length of the TS. Scale = 1mm.