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Peripheral Nervous System - Histology (view source)
Revision as of 18:43, 12 November 2011
, 18:43, 12 November 2011→Myelinated Nerve Longitudinal Section
Within the nerve bundle itself, the individual nerve fibres have a characteristic 'wavy' appearance. There are also a number of nuclei visible within the image and these are nuclei belonging to Schwann cells or to cells found within the endoneurium. At this magnification it is possible to identify some elements of the nerves themselves. In some of the fibres it is possible to visualise a faint central tubular structure which represents the axon of the nerve. (One is visible in the 6th nerve down from the top of the image). The lighter brown element of each nerve represents the myelin sheath whilst the darker brown lines surrounding both side of each nerve represents the thin cytoplasm of the Schwann cell (neurilemma cell).
Within the nerve bundle itself, the individual nerve fibres have a characteristic 'wavy' appearance. There are also a number of nuclei visible within the image and these are nuclei belonging to Schwann cells or to cells found within the endoneurium. At this magnification it is possible to identify some elements of the nerves themselves. In some of the fibres it is possible to visualise a faint central tubular structure which represents the axon of the nerve. (One is visible in the 6th nerve down from the top of the image). The lighter brown element of each nerve represents the myelin sheath whilst the darker brown lines surrounding both side of each nerve represents the thin cytoplasm of the Schwann cell (neurilemma cell).
Another clearly visible element of the individual nerves is indicated on the image by black arrows. These arrows indicate positions of [[PNSschStructure - Anatomy & Physiology#Schwann Cell|''nodes of Ranvier'']] and represents the point at which two Schwann cells meet along the length of the axon. The histologic appearance of a node is as a constriction of the neurilemma.
Another clearly visible element of the individual nerves is indicated on the image by black arrows. These arrows indicate positions of [[PNS Structure - Anatomy & Physiology#Schwann Cell|''nodes of Ranvier'']] and represents the point at which two Schwann cells meet along the length of the axon. The histologic appearance of a node is as a constriction of the neurilemma.
===Autonomic Ganglion Cross-section===
===Autonomic Ganglion Cross-section===