A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . is usual to find a short region, the neck, in which notrace of segmentation is visible. The anterior endhas the form of a bulbous swelling, known as the heador scolex (.Fig. 1305), on which are borne the organs offixation. The latter are either suckers, hooks, orboth, and the suckers may be either elongate groovesor bothridia, cup-shaped hollows or acetabula, or,as in some marine tapeworms, of a folded form whichis much more complicated. At the apex of the head is
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . is usual to find a short region, the neck, in which notrace of segmentation is visible. The anterior endhas the form of a bulbous swelling, known as the heador scolex (.Fig. 1305), on which are borne the organs offixation. The latter are either suckers, hooks, orboth, and the suckers may be either elongate groovesor bothridia, cup-shaped hollows or acetabula, or,as in some marine tapeworms, of a folded form whichis much more complicated. At the apex of the head is found in the Tseniadae amuscular organ, the which bears the hooks,usually in one or more annular rows. In form anddegree of development the rostellun is a very variableorgan; at the one extreme in Taenia saginata it isreduced to a small muscular sucking apparatus, oftenspoken of as the apical or fifth sucker of that species,while in other forms it is developed andcapable of extension or retraction into a pocket atthe apex of the scolex. It is a valuable feature in thedistinction of various species. 761. Fig. 130o.—Anterior End ofTcEnia solium. Showing Scolex,Suckers, Rostellum withHooks, and Neck. X45. Cestoda REFERENCE HANDBOOK OF THE MEDICAL SCIENCES In the head one finds the central nervous system inthe form of a bilateral ganglionic mass with one ortwo rhig-like commissures from wliich nerves are givenoff directly to the suckers and rostellum, and fromwhich the longitudinal nerve trunks pass backwardthroughout the length of the chain. Three of thesetrunks, the main lateral nerve (Fig. 1306, In) and twominor {In) are grouped together on each side of the
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Keywords: ., bookauthorbuckalbe, bookcentury1900, bookdecade1910, bookyear1913
