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Spinal cord - Coggle Diagram
Spinal cord
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Internal structure
Gray matter = neuron cell bodies, dendrite and efferent/afferent axons
White matter = decrease in proportion as the spinal cord lengthens excepts at cervical and lumbar enlargment
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Composed of:
- Neurons
- Neuroglia
- Blood vessels
Rexed laminae:
I: Non-modulated pain
II: Substancia gelatinosa
II-V => Modulated pain ==> paleospinothalamic (C)
From I-VI: Afferent info (pain, touch, proprioception)
VII: Clark's nucleus (IML: C8-L2)
VIII: Motor modulation
IX: Motor control reflexes
X: Neuroglia, visceral afferent
Embryology
Mesoderm --> Notochord, somites
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Meningeal attachment
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Spinal dura matter is attached to:
- Foramen magnum
- 2nd, 3rd, 5th cervicals
- Posterior longitudinal ligament
- Filum terminal --> coccyx
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Blood supply
Anterior spinal artery
- Within ventral fissure
- Supplies anterior 2/3 of cord
Posterior spinal artery
- Paired
- Within the dorsal intermediate sulci
- Each supply 1/6 of posterior/lateral cord
Sensory tracts
Terminology:
- Allodynia: cause by a stimulus that shouldn’t cause pain
- Hyper/hypoalgesia: Hypersensitivity to pain/ Decrease the sensation to pain
- Hypo/hyperesthesia: Decreased touch sensation/ Excessive sensitivity to touch
- Pares/disesthesia: Alteration of the sensibility (burning or prickling) without any stimulus/ With a stimulus
- Hyper/hypopalesthesia: Sensibility for vibrations
- Analgesia: Total loss of pain sensation
- Anesthesia: Loss of all the somatic sensation
Spinal cerebellar
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All to the ipsilateral cerebellum (exceptions: VSCT decussates first SC and then at superior cerebellar peduncle)
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- Anterior spinocerebellar (L)
- Rostral spinocerebellar (U)
Monitor state of spinal reflex arc, tendon organ and muscle spindle info
- Dorsal spinocerebellar (L)
- Cuneocerebelllar (U)
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Anterior lateral system
Receptors:
- Free nerve endings
- Nociceptors
- ThermoR
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Dorsal columns
- Fasciculus cuneatus (U): Lateral
- Fasciculus gracilis (L): Medial
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Transmit information (Fine touch, vibration, conscious proprioception) from the same side of the body at the spinal cord level
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