Barr's The Human Nervous System: An Anatomical Viewpoint, by John A. Kiernan

By John A. Kiernan

This vintage, succinct, well-illustrated textbook simplifies neuroscience content material to concentration insurance at the necessities and is helping scholars research vital neuroanatomical evidence and definitions. Descriptions and illustrations of the neighborhood anatomy of the principal fearful method are by means of debts of the useful pathways. the extent of remedy is suited for more and more shorter neuroanatomy classes for scientific and allied overall healthiness students.

The 9th variation positive aspects new and enhanced paintings, updates in present developments and terminology, and additions/updates to the Cranial Nerves bankruptcy and Cells of the frightened method chapter.

A spouse site bargains on-line textual content, greater than 450 interactive multiple-choice evaluation questions, case experiences, thesaurus, eponyms, abbreviations, an elevated model of chosen chapters, and pictures from the book.

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Additional resources for Barr's The Human Nervous System: An Anatomical Viewpoint, Ninth Edition

Example text

A slowly adapting receptor reports continuously on the stimulus that activates it. A rapidly adapting receptor reports changes in the stimuli it receives. , they do not continue to respond to a sustained deformation). These properties, associated with alignment in papillary ridges, allow an array of these receptors to identify with great accuracy the positions and movements of objects touching or moving across the surface of the skin. Thus, M eissner's corpuscles are the sense organs used when feeling the texture of a surface with the tips of the fingers.

Each axon is suspended in the cytoplasm of its Schwann cell by a double layer of surface membrane, the mesaxon. The myelin sheaths in peripheral nerves are formed by Schwann cells. A myelinated axon is exposed to extracellular fluid at regular intervals along its length, where there are short gaps between adjacent neurolemmocytes. The gaps are called nodes of Ranvier. One Schwann cell ensheaths either one myelinated axon or several unmyelinated axons. The surface of an unmyelinated axon is in contact with extracellular fluid along its whole length, through the cleft between the layers of its mesaxon.

The retrogradely transported material includes proteins imbibed from the extracellular fluid by axonal terminals as well as proteins that reach the axon terminals by fast anterograde transport and are returned to the perikaryon. The rate of retrograde transport is variable, but most of the material moves at about two-thirds the speed of the fast component of the anterograde transport. The rapid components of axonal transport in both directions involve predominantly particle-bound substances and require the integrity of the microtubules of the axoplasm.

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