. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 3G6 ANATOMY OF VERTEBRATES. 243 at the origin of the lateral processes of the radiating plates, before it divides to accompany and penetrate those processes. The main fissures or radiations of the pulp-cavity extend to with- in a line or half a line of the periphery of the tooth, and sud- denly dilate at their terminations into spaces, which, in transverse section, are subcircular, oval, or piyriform, p : the branches of the radiating lines, which are conti- nued into the lateral secondary plates or processes of the dent
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 3G6 ANATOMY OF VERTEBRATES. 243 at the origin of the lateral processes of the radiating plates, before it divides to accompany and penetrate those processes. The main fissures or radiations of the pulp-cavity extend to with- in a line or half a line of the periphery of the tooth, and sud- denly dilate at their terminations into spaces, which, in transverse section, are subcircular, oval, or piyriform, p : the branches of the radiating lines, which are conti- nued into the lateral secondary plates or processes of the dentinal lamella3, likewise dilate into simi- lar, and generally smaller spaces. All these spaces, or canals, in the living tooth, must have been oc- cupied by corresponding processes of the vascular pulp : they consti- tute as many centres of radiation of the fine tubes, which, with tlieir uniting clear substance, constitute the dentine. ' An analogous complexity is produced by numerous fissures, radiating from a central mass of vasodentine, which more or less fills up the pvilp cavity of the. TooLll ..[aL:ili,\ inilrin, natural pi/.e; a line i LtUjn. V. seemingly simple conical teeth. fig. 245, of the extinct ' Dendro- dont' fishes. A portion of the transverse section, a, fig. 245, magnified, fig. 24G, shows the fissures diverging from the pulp-cavity, /', and its reticulate extensions, and sending small branches into the den- tinal lamella;. These lateral offsets subdivide into a few short ramifications, like the branches of a shrub, and terminate in irregular and somewhat angular dilatations, simulating Ica-^-es, but which resoh-e themselves into radiating fasciculi of dentinal tubes. There are from fifteen to twenty-ti\e or thirty-six of these short aud small lateral brauelies on each side of the main ravs. V. I']), mr. -217, pi. C,4a, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration a
Size: 1065px × 2346px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1860
