Gross organisation of the nervous system

Beschreibung

Definitions and descriptions of neuro-anatomical components
Catherine Stanesby
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Catherine Stanesby
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definition: ganglion group of cell bodies outside of the CNS (notable exceptions include the Basal Ganglia)
definition: nucleus group of neuronal cell bodies
definition: tract group of axons within the CNS with the same origin and destination (e.g. cortico-spinal tract)
definition: nerve group of axons within the PNS with the same origin and destination
definition: pathway route within the nervous system of interconnected axons (typically comprising of more than 1 tract)
description: spinal nerves 31 spinal nerves: - 8 cervical - 12 thoracic - 5 lumbar - 5 sacral - 1 coccygeal All leave through corresponding intervertebral foramen however the spinal cord ends at vertebral level L1/L2. Thereafter, the spinal cord becomes the cauda equina (horse's tail)
classification of efferent nerves general somatic efferent (GSE) general visceral efferent (GVE) special visceral efferent (SVE)
definition: general somatic efferent (GSE) nerves fibres to skeletal muscle of somitic origin
definition: general visceral efferent (GVE) nerves fibres to smooth & cardiac muscle and glands
definition: special visceral efferent (SVE) nerves fibres to braciocephalic skeletal muscle
classification of afferent nerves general sensory afferent (GSA) general visceral afferent (GVA) special visceral afferent (SVA)
definition: general sensory afferent (GSA) nerves receive somatosensory signals
definition: general visceral afferent (GVA) nerves receive signals from visceral organs and blood vessels
definition: special visceral afferent (SVA) nerves receive signals from the gastrointestinal tract including the special senses of smell and taste
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