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Plate 3

Fig. 13. Transverse section through centrum of lower cervical region of Carnegie Embryo No. 4570, 30.7 mm, age group xxiii, cut 15 microns x75. The ganglia are entering the intervertebral foramina. Ventral dura passing laterally splits to surround large venous channel and then invests ganglia. Dura rudiment present dorsal to ganglion against lateral wall of vertebral canal. Subdural cavity forming.

Fig. 14. Transverse section through intervertebral disk of Carnegie Embryo No. 4570, 30.7 mm, age group xxiii, cut 15 microns x75. Dura rudiment may be identified to tip of neural arches and along ventral part of closure membrane. Note development of subdural space.

Fig. 15. Transverse section of mid-thoracic region of Carnegie Embryo No. 6573 31.3 mm, age group xxiii, cut 30 microns. x50. Dorsal canal wall compressed. Ventral dura distinct and separating from underlying perichondrium.

Fig. 16. Same section as figure 15. x300. Shows stratification of cells ventral to anterior median sulcus. Dura separating, except in mid-line, from underlying perichondrium of intervertebral disk.

Fig. 17. Transverse section of mid-thoracic region of Carnegie Embryo No. 7218, 80.0 mm cut 20 micron. x30. Dura mater now is a distinct membrane with subdural and epidural cavities formed. Note cell-free subdural cavity, and large venous channels in ventrolateral part of epidural space.

Fig. 18. Transverse section of lumbar region of Carnegie Embryo No. 7218, 80.0 mm cut 20 micron. x30. Shows complete dural sac of lumbar region, and subdural and epidural spaces.

Abbreviations used in Plates: d.1., dentate ligament d.m., dura mater d.p., dentate process m.p., meninx primitiva n.c., neural crest n.c.c., neural-crest cells n.p., neural process p., perichondrium pm., rudimentary posterior longitudinal ligament s., somite :p.c., spinal cord :p.g., spinal ganglion

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