. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. SKELETON. 167 usually composed of squamosal and postorbital. By alteration in the position or extent of the bones these two fossae may unite into a single temporal fossa, and again, the boundaries between this and the orbit may become broken through, the postorbital arch being imperfect or totally disappearing. (For details see Reptilia.) » Appendicular Skeleton. — The appendages of the vertebrates (fins or limbs) arise as paired outgrowths from the sides of the body, one pair, the anterior or pectoral, arising a short dista
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. SKELETON. 167 usually composed of squamosal and postorbital. By alteration in the position or extent of the bones these two fossae may unite into a single temporal fossa, and again, the boundaries between this and the orbit may become broken through, the postorbital arch being imperfect or totally disappearing. (For details see Reptilia.) » Appendicular Skeleton. — The appendages of the vertebrates (fins or limbs) arise as paired outgrowths from the sides of the body, one pair, the anterior or pectoral, arising a short distance behind the pharyngeal region, the other, or pelvic (ventral) Fig. 177. Developing fin of trout, after Corning. /, fin; »;, myotomes; n, notochord ; tlie myotomes are seen to be proliferating strands of cells into the fin. a little in front of the vent. In the higher vertebrates each limb grows out as a simple bud, but in some elasmobranchs the appendages arise as differentiations of a continuous lateral fold on either side of the body. Into these outgrowths migrate cells derived from the muscle plates (Fig. 177), which are to. 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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