Neuronal architecture of the spinal cord: prorioceptive and nociceptive (withdrawal) reflex arcs Viktória Vereczki M.D., PhD. Viktória Vereczki M.D., PhD. Department of Anatomy, Department of Anatomy, Histology and Embryology Histology and Embryology Semmelweis University Semmelweis University
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Neuronal architecture of the spinal cord: prorioceptive and nociceptive (withdrawal) reflex arcs Viktória Vereczki M.D., PhD. Department of Anatomy, Histology.
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Neuronal architecture of the spinal cord: prorioceptive and
nociceptive (withdrawal) reflex arcs
Viktória Vereczki M.D., PhD.Viktória Vereczki M.D., PhD.Department of Anatomy, Histology and Department of Anatomy, Histology and EmbryologyEmbryologySemmelweis UniversitySemmelweis University
Gross anatomy of spinal cord
•45 cm lon
from the atlas to L1-L2
•Maximal volumes:
Intumescentia cervicalis: 38mm
Intumescentia
lumbalis: 35 mm
Gross anatomy of spinal cord
Gross anatomy of spinal cord
Spinal ganglion
Pseudounipolar neurons in the spinal ganglion (HE)
•Lateral gray column( only at thoracic segments) lateral horn (visceromotor neurons)
Neuronal architecture of spinal cord- gray matter
Neuron types: 1. radicular
2. funicular
3. internuncial
4. interneurons: f.i. Renshaw cells
Neuronal architecture of spinal cord- gray matter
Rexed laminae of spinal cord
( at the level of Th10)
1. Dorsal nucleus of Clarke-Stilling
2. Proper nucleus of dorsal comumn
3. Substantia gelatinosa (Rolandi)
4. Marginal zona
5.Intermediolateral cell column
6. Intermediomedial cell collumn
7. Motor neurons of ventral horn
Laminae of Rexed Afferent fibers, terminating here Efferent fibers , originating here
lamina I. –marginal zone Marginal neurons (Waldeyer-neurons): pain - and temperature sensory neurons, visceral afferents, from brain stem: monoaminoergic descending fibers
Tr. spinothalamicus
Dorsolateral tract of Lissauer
lamina II. -substantia gelatinosa (Rolandi)
From the skin nociceptive fibers: unmyelinated os myelinated, from brain stem: monoaminoergic descending fibers
The unmyelinated axons of substantia gelatinosa cels ascend or descend for up to four segments of the spinal cord; their branches synapse within the dorsal horn
lamina III-IV. nucleus proprius columnae dorsalis
Mechanoreceptors of skin Spinothalamic tract
lamina V-VI. Transmitting touch , pain and visceral signals
Spinothalamic tract
Fibers associating within the spinal cord
lamina VII. -nucleus dorsalis seu nucleus thoracicus (Clarke-Stilling nucleus)