Skip Navigation
Stage 1 / 1 day Stage 2 / 2-3 days Stage 3-1 / 4 days Stage 3-2 / 4-5 days Stage 4 / 6 days Stage 5a-1 / 7 days Stage 5a-2 / 8 days Stage 5b / 9 days Stage 5c / 12 days Stage 6 / 13-17 days Stage 7 / 16-19 days Stage 8 / 23 days Stage 9 / 25 days Stage 10 / 28 days Stage 11 / 29 days Stage 12 / 30 days Stage 13 / 32 days Stage 14 / 33 days Stage 15 / 36 days Stage 16 / 39 days Stage 17 / 41 days Stage 18 / 44 days Stage 19 / 45-47 days Stage 20 / 49 days Stage 21 / 49-52 days Stage 22 / 52-55 days Stage 23 / 56 days
Atlas of Human Embryos Chapter   Figure

L-5 spinal ganglion, S-1 spinal ganglion, S-2 spinal nerve, S-3 ventral primary ramus, caudal end of sympathetic trunk, caudal limb of midgut, centrum, cranial limb of midgut, ectomeninx, endomeninx, extensor muscles of leg, flexor muscles of leg, intervertebral disc, labioscrotal swelling, left umbilical artery, right umbilical artery, sole of foot, tail bud remnant, umbilical coelom, umbilical vein

A section through the tip of the tail bud remnant.

Observe:
1. The caudal end of the sympathetic trunk.
2. The relative position of the extensor and flexor muscles in the leg.


Keywords: L-5 spinal ganglion, S-1 spinal ganglion, S-2 spinal nerve, S-3 ventral primary ramus, caudal end of sympathetic trunk, caudal limb of midgut, centrum, cranial limb of midgut, ectomeninx, endomeninx, extensor muscles of leg, flexor muscles of leg, intervertebral disc, labioscrotal swelling, left umbilical artery, right umbilical artery, sole of foot, tail bud remnant, umbilical coelom, umbilical vein

Source: Atlas of Human Embryos.