Nonprimary Sensory Projections on the Cat Neocortex

Buser, P; Bignall, K.E.

doi:10.1016/s0074-7742(08)60152-x

Cited by 124 publications

(10 citation statements)

References 128 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This secondary area was evident in 4 of the 5 animals mapped, and might possibly correspond to the 'association' area in the anterior marginal gyrus of the cat [Slimp and Towe, 1980], The most striking feature revealed by the mapping studies was the presence of a frontal 'association' area anterior to the 'motor' cortex. A similar area was not reported for the Grey squirrel [Nelson et al, 1979;Suret al, 1978], but an analo gous area, also lacking in topographic or ganization, has been identified in chloraiose-anesthetized cats [Buser and Bignall, 1968;Doetsch et al, 1977]. However, the potentials are positive-negative in cats, whereas they are purely surface-negative in the woodchuck.…”

Section: Somatosensory Cortexsupporting

confidence: 64%

The Pyramidal System of the Woodchuck

Doetsch¹,

Towe²

1981

Brain Behav Evol

View full text Add to dashboard Cite

The pyramidal system of the woodchuck was examined anatomically and electrophysiologically. The pyramidal tract was found to originate entirely within the anterior half of the cerebral hemispheres and to follow a course typical of most rodents, decussating almost entirely and descending the length of the spinal cord in the ventral part of the dorsal funiculi. It decreased in size uniformly with distance along the spinal cord; most of its fibers terminated in the medial half of the dorsal horn, though they scattered widely and even appeared to terminate on motoneurons. Each tract contained 140,000±20,000 fibers, with 60–80% of the fibers being about 1 µm and 90% being less than 3 µm in diameter. Stimulation of the medullary pyramid evoked a minute antidromic potential (a wave) which was generally obscured by a large surface-positive response that reversed polarity deep in the cortex and that appeared to be synaptic in origin (r wave). It is proposed that the r wave results from intracortical pyramidal cell collateral activity. Though largest in the apparent region of origin of the pyramidal tract, the r wave also showed local maxima in the forepaw and hindpaw foci of somatosensory cortex. The somatosensory cortex was organized in a manner similar to other rodents, but an ''association'' area lacking topographical organization was found near the anterior pole of the hemispheres. In an allometric sense, the woodchuck was found to be a ''normal'' rodent and a ''normal'' mammal.

show abstract

Section: Somatosensory Cortexsupporting

confidence: 64%

The Pyramidal System of the Woodchuck

Doetsch¹,

Towe²

1981

Brain Behav Evol

View full text Add to dashboard Cite

show abstract

“…There is also the possibility of somasthetic input to the parabrachial region from the adjacent spinothalam ic tract. This type of multisensory input to the caudal tip contrasts with the exclusively auditory nature of the rest of the parvocellular medial gen iculate, but is consistent with the multimodal character of the insulotemporal and other para-auditory cortex [Busher and Bignall, 1967], Medial Geniculate, Internal Division All studies of ascending projections of the inferior colliculus to the thalamus cite terminals from brachial fibers in the internal or magnocellular division of the geniculate. In the cat, additional input to the magnocellular nucleus has been demonstrated from the spinothalamic tract [Nauta and Kuypers, 1958;Goldberg and Moore, 1967], the superior collicu lus [Altman and Carpenter, 1961], and the vestibular nuclei [Mickle and A des, 1962], In the monkey, sensory input other than auditory to the internal medial geniculate is known to exist from the spinothalamic tract and dorsal column system [Mehler et al, 1960;Bowsher, 1961;Gold berg and Moore, 1967] and from the superior colliculus [Benevento and Fallon, 1975].…”

Section: Auditory Inina To the Thalamus Medial Geniculate Principal supporting

confidence: 66%

Projections of the Inferior Colliculus in Insectivores and Primates; pp. 314–327

Moore¹,

Karapas²,

Moore³

1977

Brain Behav Evol

View full text Add to dashboard Cite

The inferior colliculus is a nucleus of obligatory synapse in the ascending brain stem auditory pathways. Projections from the inferior colliculus in primates and insectivores are similar to that demonstrated in other mammals, with short direct projections to the external nucleus of the colliculus and adjacent regions of the central gray and superior colliculus ipsilaterally, and fibers crossing in the commissure of the colliculus to innervate the contralateral central and external nuclei. Long projection fibers enter the brachium of the inferior colliculus bilaterally, but the projection is markedly heavier on the side ipsilateral to the lesion. Brachial fibers supply terminals to two regions of the rostral midbrain tegmentum, the parabrachial area and the interstitial nucleus of the inferior brachium. On reaching the thalamus, brachial fibers bypass the caudal tip of the medial geniculate, but arborize to form a dense plexus of axons and terminals throughout the remainder of the principal nucleus of the geniculate and the entire internal division on the ipsilateral side. A lighter and more restricted projection to the opposite medial geniculate is seen in all primates, and particularly in the hedgehog. The small size of the contralateral tectothalamic pathway in the hedgehog is the only significant species difference noted in this study.

show abstract

“…Aside from the traditionally known area around the frontal pole, a further region, occupying parts of the insular cortex above the rhinal sulcus, was detected. Functionally, this insular region seems to belong among the polysensory integration areas of the cat's cortex (Avancini, Mancia, & Pelliccioli, 1969;Benevento & Loe, 1975;Buser & Bignall, 1967;Stephan, 1975 Figure 18.18), but also parts of the cingulate cortex belong to the prefrontal cortex as defined by Rose and Woolsey. Akert (1964, Figure 18.4) did not detect retrograde degeneration in the mediodorsal thalamic nucleus after ablations of the cortex in the medial wall and had therefore suggested that this cortex might be athalamic and "may represent 'association' cortex in the classical sense" (p. 381).…”

Section: Catmentioning

confidence: 99%