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Plate 4

Fig. 19. Transverse section of lower cervical region of Carnegie Embryo No. 4473, 43.0 mm.. cut 20 microns. X230. Shows single cell layer of pia mater and anterior spinal artery. also dura mater and perichondrium with rudiment of posterior longitudinal ligament between them.

Fig. 20. Transverse section of upper thoracic region of Carnegie Embryo No. 4475, 48.0 mm. cut 20 microns x250. Pia mater and dura mater lying medial to spinal ganglion.

Fig. 21. Frontal section of thoracic region of Carnegie Embryo No. 8118,12.6 mm.. age group xvii, cut 10 microns. x200. Interganglionic tissue connecting dense laterally situated mesenchyme with lateral border of neural tube representing the earliest indication of a dentate process.

Fig. 22. Transverse section of occipitocervical region of Carnegie Embryo No. 7592, 32.7 mm.. age group xxi. cut 20 microns. x50. First dentate process extending dorsomediad from rudiment of occipital bone to neural tube.

Fig. 23. Frontal suction of mid-thoracic region of Carnegie Embryo No. 6832; 23.3 mm.. age group xxii. cut . 20 microns. x150. Dentate process joins laterally the cerebral arch rudiment, and medially a thickening of the pia mater. the rudimentary denticulate ligament.

Fig. 24. Transverse section of upper thoracic region of Carnegie Embryo No. 4570, 30.7 mm., age group xxiii. cut 15 microns.x100.Interganglionic section showing dentate process.

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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