. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. DEVELOPMENT OF APPENDICULAR SKELETON 185 named from their relation to the bones of the forearm, radiate, intermedium, and ulnare; and a distal on^composed of four elements, termed carpalia. In addition, a cartilage, termed the pisiform, is found on the ulnar side of the proximal row ^nd is generally j^g&rded as a sesamoid cartilage developed in the/tendon of the flei ulnaris, and furthermore a number of inconstant carti been observed whose significance in the majority of cast less obscure
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. DEVELOPMENT OF APPENDICULAR SKELETON 185 named from their relation to the bones of the forearm, radiate, intermedium, and ulnare; and a distal on^composed of four elements, termed carpalia. In addition, a cartilage, termed the pisiform, is found on the ulnar side of the proximal row ^nd is generally j^g&rded as a sesamoid cartilage developed in the/tendon of the flei ulnaris, and furthermore a number of inconstant carti been observed whose significance in the majority of cast less obscure. These accessory cartilage^either disappc stages of development or fuse with neighboring cartilages^ cases, ossify and form distinct elements of the carpus, however, occurs so frequently as almdK to deserve^ classification as a constant element; it \p known asvthje ceniraie (Fig. 114, c) and occupies a position between the/car\ua!§;es of the proximal and distal rows and apparently correspond ~r&. a cartilage typVally present in lower forms and o^fying*to~f»rai a distinct bone. Iri tha human carpus its fate varies, wfe it may\eitnfer disappear or unitp with other cartilages, that with wpich it most usually fuses b'eing probably the radiale. There is evraence also to sfrftw that another ofJthe accessory cartilages unites/with the ulnar element of the distatsAw, represent- ing the carpale v typically present in lower forms. Each of the eleinents corresponding to an adu^t) bone ossifies from a single centerwith the exception of carpale iv-Xwhich has two centers, a furtherindication of its composite character. The rela- tion of the cartrteg&s to the adult bones may be seen from the table given on page loX^J \v_^ With regard toYhe metacarpals and phalanges; it need merely be stated that each develops from a single primary center for the shaft and one secondary epiphysial center. The" primary center appears at about the middle of the shaft excepJ in the terminal phalan
Size: 1336px × 1869px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookautho, bookcentury1900, bookdecade1910, booksubjectembryology
