. The chordates. Chordata. o&pc. rclc a)r. st. Fig. 108. (Left) Dorsocaudal aspect of atlas. (027) Anterior articular process; (fr) aperture of the transverse foramen which enters the atlas at (»/); (nc) neural canal; (sp) spinous process; (tr) transverse process; (zg) posterior articular process. (Right) Lateral aspect of the epistropheus (axis), (ar. st.) Anterior articular process; (nl, sp.) neural spine or spinous process; (od. pr.) odontoid process; (p. zg.) posterior articular process; (trs. pr.) transverse process; (vrt. c.) transverse foramen. (Courtesy, Stromsten: "Davison's
. The chordates. Chordata. o&pc. rclc a)r. st. Fig. 108. (Left) Dorsocaudal aspect of atlas. (027) Anterior articular process; (fr) aperture of the transverse foramen which enters the atlas at (»/); (nc) neural canal; (sp) spinous process; (tr) transverse process; (zg) posterior articular process. (Right) Lateral aspect of the epistropheus (axis), (ar. st.) Anterior articular process; (nl, sp.) neural spine or spinous process; (od. pr.) odontoid process; (p. zg.) posterior articular process; (trs. pr.) transverse process; (vrt. c.) transverse foramen. (Courtesy, Stromsten: "Davison's Mammalian Anatomy," Philadelphia, The Blakiston Company.) EPIDERMIS DERMATOME MYOTOME SCLEROTOME. Fig. 109. A diagram showing the relations of myotomes and sclerotomes as seen in a horizontal section of a vertebrate embryo. (A) Anterior; (P) posterior. The upper half of the figure shows the relations in an earlier stage of development, while the lower half represents a later stage. The posterior half (finely dotted) of each sclerotome unites with the anterior half (coarsely dotted) of the following sclerotome to form a centrum. Thus the centra alternate in position with the myo- tomes and each myotome becomes attached to two vertebrae. (Courtesy, Neal and Rand: "Chordate Anatomy," Philadelphia, The Blakiston Company.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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