The dorsal trigemino‐thalamic tract in the cat reconsidered as a lateral reticulo‐thalamic system of connections

Russell, Glenn V.

doi:10.1002/cne.901010202

Cited by 52 publications

(7 citation statements)

References 10 publications

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“…Complementing this result was the absence of any effect of block of n. caudalis on responses of 80 % of VPM cells. This confirms that the major source of input to these cells arises in the rostral trigeminal complex, and is in accord with the degeneration studies of Le Gros Clark (1936), Walker (1939), Russell (1954), and Carpenter & Hanna (1961).…”

Section: Discussionsupporting

confidence: 89%

Somatic afferent input to posterior thalamic neurones and their axon projection to the cerebral cortex in the cat

Rowe¹,

Sessle²

1968

The Journal of Physiology

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SUMMARY1. A technique of reversible block of synaptic transmission through the dorsal column nuclei and the trigeminal nucleus caudalis (n. caudalis) has been employed to assess the somatic afferent input to individual posterior thalamic neurones in the cat. The axon projection to the cerebral cortex of these neurones has been identified by antidromic activation following cortical stimulation.2. Unitary responses in the nucleus ventralis posterolateralis (VPL) evoked by cutaneous stimulation were abolished or depressed following block of transmission in the dorsal column nuclei. Block in n. caudalis, however, depressed unitary responses in nucleus ventralis posteromedialis (VPM) evoked by facial skin stimulation in less than 10 % of cells.3. A more complex source of the somatic input to the posterior nuclear region of the thalamus (PO) was found. It was most commonly noted that PO unitary activity evoked by cutaneous stimulation of the face was unaffected by block of synaptic transmission in n. caudalis. No uniform effect was observed on unitary responses in PO evoked by limb stimulation when transmission in the dorsal column nuclei was blocked. 4. Antidromic activation from the cerebral cortex was seen in 69 % of ventrobasal neurones. Most cells (66 %) had 'antidromic cortical fields' restricted to a region consisting of a third to a half of the specific somatic projection areas. In 10 % of cells evidence was obtained for discontinuous cortical 'antidromic fields' suggesting subcortical bifurcation of the projecting axon.5. An axon projection to the cortex was found in 35 % of PO cells, about half of which projected only to specific somatic projection areas.

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Section: Discussionsupporting

confidence: 89%

Somatic afferent input to posterior thalamic neurones and their axon projection to the cerebral cortex in the cat

Rowe¹,

Sessle²

1968

The Journal of Physiology

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“…Rather, such stimulation will generally involve direct fibres of the central tegmental fasciculus wbich contain not only the spinal com|>onents demonstrated here, but also at least two trigeminal components, the dorsal secondary trigeminal tract (Torvick, 1957) and the trigemino-reticulo-thalamic path (Kerr et al, 1955). Russell (1954), Nauta and Kuypers (1958), and Brodal and Rossi (1955) have also shown that ascending systems of direct fibres are present in the region of the reticular arousal system which was formerly considered to be a system of short chain relays within the reticular substance of the brainstem (Starzl et al, 1951, a and b).…”

Section: Discussionmentioning

confidence: 99%

An Afferent System in the Central Tegmental Fasciculus

Dennis¹,

Kerr²

1961

Aust J Exp Biol Med

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SUMMARY The brainstem course of the limb afferent component of the central tegmental fasciculus has been determined in both the cat and the phalanger, Trichosurus vulpecula, using evoked potentials. Unit records obtained from the reticular formation indicate that the ascending central tegmental fasciculus arises in large part from the level of the superior olives. The termination of the system is found mainly in n. parafascicularis of the posterior thalamus. Attention is drawn to the correspondence between the ascending central tegmental fasciculus and the reticular activating system (arousal system) of the medial brainstem.

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“…Fibres arising from the m ain sensory nucleus and running to the ipsilateral thalam us, via the dorsal Irigem ino-thalam ic tract have been described by Wallenberg [1905] Economo [ 1911] in the monkey and m an, Walker 119391 in the monkey and Russell [1954] ill the cat described fibres from the main sensory nucleus running to the contralateral thalam us via the medial lem niscus. In none of these papers was the silver im pregnation method used and except for Verhaart, who used H aggqvist's staining m ethod, all the other authors employed the Marclii m ethod.…”

Section: K Arama N U D Is and Voogdmentioning

confidence: 99%

Trigemino-thalamic fibre connections in the goat. An experimental anatomical study

Karamanlidis¹,

Voogd²

1970

Cells Tissues Organs

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The dorsal trigemino‐thalamic tract in the cat reconsidered as a lateral reticulo‐thalamic system of connections

Cited by 52 publications

References 10 publications

Somatic afferent input to posterior thalamic neurones and their axon projection to the cerebral cortex in the cat

Somatic afferent input to posterior thalamic neurones and their axon projection to the cerebral cortex in the cat

An Afferent System in the Central Tegmental Fasciculus

Trigemino-thalamic fibre connections in the goat. An experimental anatomical study

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