A section through the T-7 spinal ganglion.
Observe:
1. The mesonephric duct coursing longitudinally on the lateral aspect of the mesonephros.
2. The edge of the mesoderm that surrounds the midgut loop in Section 29.
3. The mid- and hindgut junction.
4. The caudal edge of the umbilical vein.
5. The junction of the cloacal membrane with the cloaca.
Keywords: T-7 spinal ganglion, cloaca, cloacal membrane, dorsal mesentery, edge of umbilical vein, labioscrotal swelling, mammary ridge, mesonephric duct, mesonephros, midgut mesoderm, midgut-hindgut junction (endoderm), spinal cord in tail bud, urogenital sinus
Source: Atlas of Human Embryos.