The lateral sacral arteries
arise from the posterior division of the internal iliac artery
; there are usually two, a superior and an inferior.
The superior, of large size, passes medialward, and, after anastomosing with branches from the middle sacral
, enters the first or second anterior sacral foramen
, supplies branches to the contents of the sacral canal
, and, escaping by the corresponding posterior sacral foramen
, is distributed to the skin and muscles on the dorsum
of the sacrum, anastomosing with the superior gluteal
The inferior runs obliquely across the front of the piriformis
and the sacral nerves
to the medial side of the anterior sacral foramina, descends on the front of the sacrum, and anastomoses over the coccyx
with the middle sacral and opposite lateral sacral artery.
In its course it gives off branches, which enter the anterior sacral foramina; these, after supplying the contents of the sacral canal, escapes by the posterior sacral foramina, and are distributed to the muscles and skin on the dorsal surface of the sacrum, anastomosing with the gluteal arteries.
- - "The Female Pelvis: Branches of Internal Iliac Artery"