Journal of comparative physiology

, Volume 102, Issue 1, pp 77–84 | Cite as

Command fiber control of crayfish abdominal movement

II. Generic differences in the extension reflexes ofOrconectes andProcambarus
  • Charles H. Page


  1. 1.

    The crayfishProcambarus clarkii almost always extends its abdomen when it is lifted up from the aquarium floor into the water column.

  2. 2.

    Under identical stimulus conditions bothOrconectes rusticus andO. virilis rarely respond by full abdominal extension. Usually they move their abdomens to a position intermediate to extension and flexion.

  3. 3.

    Comparison of these results with those in the preceding paper (Page, 1975) reveals that extension sensitivity is correlated with the presence of extension command fibers in the circum-esophageal connectives (P. clarkii) while extension insensitivity is associated with the apparent absence of extension command fibers in these connectives (O. rusticus andO. virilis).

  4. 4.

    The correlation between presence of command fibers and extension sensitivity provides support for the assumption that command fibers control the generation of behavior patterns in animals.



Water Column Behavior Pattern Stimulus Condition Preceding Paper Apparent Absence 
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Copyright information

© Springer-Verlag 1975

Authors and Affiliations

  • Charles H. Page
    • 1
    • 2
  1. 1.Department of PhysiologyRutgers UniversityNew Brunswick
  2. 2.Department of Zoology and MicrobiologyOhio UniversityAthensUSA

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