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25 Cards in this Set
- Front
- Back
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What is the only cranial nerve that carries somatosensory information from the head?
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Trigeminal (V)
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Somatosensory System
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• Touch (discriminative, non-discriminative)
• Temperature • Proprioception (body position) • Nociception (pain) |
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How many pairs of spinal nerves do we have?
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31
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How many pairs of nerves do we have ?
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43
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Where do cell bodies of 1st order neurones lie?
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Ganglia outside the CNS
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Where do cell bodies of 2nd order neurones lie?
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spinal cord or brain stem
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Which order of sensory neurones cross over?
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2nd order
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What is the diencephalon composed of?
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epithalamus,
thalamus, subthalamus +
hypothalamus
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What is the largest part of the diencephalon?
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thalamus
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What connects the 2 thalami?
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Interthalamic adhesion
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What makes up the lateral walls of the 3rd ventricle?
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thalami
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What sensory information is relayed through the thalamus before reaching the cortex?
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Only smell (partially) and info going to cerebellum are exceptions... ALL other sensory info
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Which cranial nerve connects directly to the thalamus?
What happens to the other CNs? |
Optic (II)
They relay with their nuclei in the brain stem 1st |
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Spinal nerve roots are functionally distinct? T or F
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True
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Name the 3 ascending sensory tracts?
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- Dorsal columns (fasciculus gracilis, fasciculis
cuneatus) – Spinothalamic tracts – Spinocerebellar tracts |
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Medial lemniscus
Trigeminal lemniscus |
pathway in the brainstem that carries sensory information from the gracile and cuneate nuclei to the thalamus
equivilant pathway for the sensory information of the trigminal nerve |
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Postcentral gyrus
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Of parietal lobe: Primary somatosensory area
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Romberg's sign
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Can't maintain balance with eyes closed due to lesion of dorsal column interfering with proprioception
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Modalities carried by the dorsal column
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FVC
Fine touch vibration concious proprioception |
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What are the 2 tyeps of pain fibres?
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1) thinly myelinated - withdrawal
2) unmyelinated - no withdrawal (immobilisation) |
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Describe lamination of the spinothalamic tracts
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fibres layered progressively so that those from lower part of body lie on outer rim, + those from upper body in the inner rim
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Describe lamination of the dorsal columns
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Fibres from lower limb on inside, fibres from upper limbs on outside
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Brown sequard
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Contralateral loss of Pain, Pressure, Temperature, crude Touch
Ipsilateral loss of Fine touch, Vibration, Concious proprioception |
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Modalities carried by spinocerebellar tract
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unconcious proprioception
some pain/pressure |
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What's different about the spinocerebellar pathway?
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2 neurone pathway (not 3)
The pathways remain ipsilateral (ventral pathways do cross over but cross back in cerebellum) |
