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2 results

  • Chapter 2 - Basic Anatomy and a Little Physiology

  • John A. Jarratt, Emeritus, Sheffield Teaching Hospitals NHS Foundation Trust
  • Book:
    Essential Electromyography
    Published online:
    14 September 2023
    Print publication:
    05 October 2023, pp 4-6

  • Summary

    The distinction between the anatomy of the peripheral and central nervous systems is made, as is that between grey matter and white matter. An understanding of how the peripheral nervous system connects to the central nervous system is important and briefly described. The chapter concludes with a section on the soma, axon hillock and initial segment, which should aid appreciation of anterior horn cell activation and firing frequency.

  • INITIAL SEGMENTS OF THE DEGREES OF CEERS

  • Part of
  • URI ANDREWS, ANDREA SORBI
  • Journal:
    The Journal of Symbolic Logic / Volume 87 / Issue 3 / September 2022
    Published online by Cambridge University Press:
    18 February 2022, pp. 1260-1282
    Print publication:
    September 2022

  • It is known that every non-universal self-full degree in the structure of the degrees of computably enumerable equivalence relations (ceers) under computable reducibility has exactly one strong minimal cover. This leaves little room for embedding wide partial orders as initial segments using self-full degrees. We show that considerably more can be done by staying entirely inside the collection of non-self-full degrees. We show that the poset can be embedded as an initial segment of the degrees of ceers with infinitely many classes. A further refinement of the proof shows that one can also embed the free distributive lattice generated by the lower semilattice as an initial segment of the degrees of ceers with infinitely many classes.