. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. 42 ANA'l'()M^â ov rill': RAHin r irsi)ira(()i-\' organs. In lii^licr Icnwsdial animals it appears as an onibryonic fcalurr [Vlu;. 21, in., h., 1, 2) and is to be eonsidered both as a determinant of adnlt form and as a mark of aqnatic ancestry. It mulcrlies (he arrani^ement not onl>- of structnres which in the lower vertel)rates belong- to fnnctional gills (branchial arches in the restricted sense) but also of modified branchial structures such as the first visceral, or
. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. 42 ANA'l'()M^â ov rill': RAHin r irsi)ira(()i-\' organs. In lii^licr Icnwsdial animals it appears as an onibryonic fcalurr [Vlu;. 21, in., h., 1, 2) and is to be eonsidered both as a determinant of adnlt form and as a mark of aqnatic ancestry. It mulcrlies (he arrani^ement not onl>- of structnres which in the lower vertel)rates belong- to fnnctional gills (branchial arches in the restricted sense) but also of modified branchial structures such as the first visceral, or mandibular arcli (m.) and the second visceral, or liyoid arch (h.). The modification of these structures in passing ect. V fns. \^?':-:-- Fig. 22. Transverse section of a rabbit-embryo of about 10V2 days, showing the arrangement of the organ-systems: ao., aorta; ch., notochord; coe., coelomic cavity; , dorsal mesoderm (myotomic and sclcrotomic divisions); e., primitive alimentary canal (cnteron); ect., ectoderm; , limb-bud; ms., mesenchyme; my., external portion of a myotome; n., neph- rotome of embryonic kidney; intermediate mass of mesoderm; sp. and so., splanchnic (\isceran and somatic (parietal) portions of the ventral mesoderm. from the embryonic to the adult condition is very great, but their arrangement determines the position and relations of certain skeletal structures, including the auditory ossicles, the hyoid, and in part the laryngeal cartilagesâa point of some value in the classification of the parts of the head skeleton. It also determines the succession of certain soft structures, including- the fifth, seventh, ninth, and. 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 Bensley, B. A. (Benjamin Arthur), 1875-1934; Craigie, E. Horne (Edward Horne), 1894-. Philadephia : Blakiston
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