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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.