The nervous system and its functions / By Herbert Mayo.

  • Herbert Mayo
Date:
1842
Catalogue details

Licence: Public Domain Mark

Credit: The nervous system and its functions / By Herbert Mayo. Source: Wellcome Collection.

    29/208 page 15
    ad being has not been met with of so simple a type as to admit of its whole organization being supplied from a single sensorial nodule. The type of construction of the radiata and lower articulata is the compound or multiple type. Each being consists of two or more organizations, each capable of surviving and of living independently of the other, when the animal is divided into two or more pieces. For such a compound animal a compound nervous system is requisite. Instead of one sensorial nodule with its nerves, there must be several. These are united to form one organ, by means of fasciculi of white nervous matter, which extend one from each sensorial nucleus to the next. The disposition of the parts of the nervous system in a compound animal may, then, be thus modelled. Take as many small beads with filaments of thread attached, as there are repetitions of the organization; so for the nervous system of a star-fish with five rays, five beads would be necessary. Then pass a thick silk through the five beads, and having so strung them, fasten them at regular inter- vals, and tie together the ends of the string. The compound central nerve-organ would be represented by the silk and beads: the
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