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Cranial Nerves - Anatomy & Physiology (view source)
Revision as of 16:33, 11 August 2011
, 16:33, 11 August 2011→Cranial Nerve Fibre Types
Many of the cranial nerves with nuclei within the brain stem contain sensory and motor neurone components. The sensory fibre components have their cell bodies located in ganglia outside the central nervous system and the motor fibre element have their cell bodies within the central nervous system.
Many of the cranial nerves with nuclei within the brain stem contain sensory and motor neurone components. The sensory fibre components have their cell bodies located in ganglia outside the central nervous system and the motor fibre element have their cell bodies within the central nervous system.
==Cranial Nerve Fibre Types==
==Cranial Nerve Fibre Types==
Prior to a full explanation of each cranial nerve function, physiology, anatomy and particularly composition, the numerous types of nerve fibre found in cranial nerves must be explained to ensure that the following page can be better understood. Nerve fibres can undertake numerous roles within the body and their function is dictated by what type of fibre the nerve is composed of. A classification scheme is used to describe the type of fibres found within the cranial nerves and therefore provide a better understanding of the function and composition of that particular nerve. Below is a brief outline of this nerve fibre classification.
===Afferent Fibres - Sensory===
====General Somatic Afferent (GSA)====
This type of fibre is used in the majority of basic senses including temperature, touch and pain.
====Special Somatic Afferent (SSA)====
The special signifies that this fibre type is found in nerves related to the special senses which include vision and hearing. This therefore relates to the optic nerves (cranial nerve II) and the auditory/vestibular systems which are the vestibulocochlear nerves (cranial nerve VIII).
====General Visceral Afferent (GVA)====
This fibre type is commonly found in sensory nerves to organs and to sensory tissues related to chemicals.
====Special Visceral Afferent (SVA)====
This fibre type is found again in special sense organs including taste and olfaction.
*'''General Somatic Motor (GSM)'''
*'''General Somatic Motor (GSM)'''