Quantitative Analysis of Myelinated Axons of Commissural Fibers in the Rat Brain

Sargon, Mustafa F.; Mas, Nüket; Senan, Sevda; Özdemir, Bülent; Çelik, Hakan; Cumhur, Meserret

doi:10.1046/j.1439-0264.2003.00446.x

Cited by 16 publications

(16 citation statements)

References 12 publications

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“…In the literature, there are only a few studies, examining the number of myelinated axons of the rostrum, genu, truncus and splenium parts of the corpus callosum by using a camera lucida. In one of these studies, Sargon et al (2003) counted the myelinated axons of the parts of the corpus callosum in the rat brain. In parts of the corpus callosum, they found a statistically significant difference between the rostrum and genu, rostrum and truncus, rostrum and splenium, genu and truncus and the genu and splenium.…”

Section: Discussionmentioning

confidence: 99%

“…In parts of the corpus callosum, they found a statistically significant difference between the rostrum and genu, rostrum and truncus, rostrum and splenium, genu and truncus and the genu and splenium. In another study, Sargon et al (2004) examined the number of myelinated axons of the parts of the corpus callosum in the cat brain, by using a camera lucida. In this study, they found a statistically significant difference between the rostrum and genu, rostrum and truncus, genu and truncus, genu and splenium, and truncus and splenium.…”

Section: Discussionmentioning

confidence: 99%

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Quantitative Analysis of Myelinated Axons of Corpus Callosum in the Human Brain

Sargon

Aksit

et al. 2007

International Journal of Neuroscience

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In this study, the myelinated axons of the rostrum, genu, truncus and splenium parts of the corpus callosum were counted in the human brain by using a camera lucida. The numerical densities of these axons were compared with each other by means of quantitative analytical statistical methods. The number of myelinated axons of genu and truncus of the corpus callosum were found to be highest in number and they were nearly the same with each other. However, number of the myelinated axons of splenium was found to be lower in number, when compared with the other parts of corpus callosum.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Quantitative Analysis of Myelinated Axons of Corpus Callosum in the Human Brain

Sargon

Aksit

et al. 2007

International Journal of Neuroscience

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“…These fibers are myelinated, invade the pineal gland, and can be traced a short distance into the lateral pre-tectal area (15). Also, a quantitative analysis of the myelinated axons of commissural fibers in the rat brain demonstrated a heterogeneous distribution of myelinated axons in the posterior and habenular commissures (13).…”

Section: A B a Bmentioning

confidence: 99%

The anatomy of the posterior commissure

Özdemir¹

2015

Turkish Neurosurgery

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AIm: The connections of posterior commissure are defined. Its fibers mediate the consensual light reflex by interconnecting the pretectal nuclei. The fiber connections from the thalamic, pretectal, superior colliculus and the habenular nuclei are known, but they have not been shown anatomically. The present study is a fiber dissection study to define the anatomy of the posterior commissure. mAterIAl and methOds: Twenty formalin-fixed sheep heads were used in the study. The specimens were fixed in 10% formalin solution for 3 weeks. The arachnoidal and vascular structures were removed by using a surgical microscope magnification (x6-x40) and brains were again fixed for 4 weeks at -20°C. The fiber dissections were performed at Marmara University, Rhoton Laboratory. Also, a radiological tractographic study was carried on five healthy volunteers to see the posterior commissure cortical connections. results:In fifteen sheep brains, the dimensions of the posterior commissure were measured as 1.36 mm (range 0.5-2.5 mm) width, and as 4.6 mm (range 3-6 mm) length. In the dissection study, a frontotemporooccipital fascicle was observed to connect with the fibers of the posterior commissure. Diffusion tensor imaging scans showed the frontotemporooccipital tract to extend to posterior commissural region.COnClusIOn: To our knowledge, this is the first anatomical and tractographic study regarding the posterior commissure. However, further human cadaveric studies are necessary. BulGulAr: On beş koyun beyninde posterior komissür'ün ortalama kalınlığı 1,36 mm (0,5-2,5 mm), uzunluğu 4,6 mm (3-6 mm) olarak bulundu. Posterior komissür'ün her iki tarafta superior ve inferior kolikulusları bağladığı; habenula, pretektal, tektal ve periakuaduktal bölgeden kısa liflerle bağlantı kurduğu görüldü. Bazı spesimenlerde hipokampal komissür liflerinin splenial bölgede bu liflere eşlik ettiği izlendi. Talamik diseksiyondan sonra gözlenen frontotemporooksipital fasikülün posterior komissür'e uzandığı saptandı. sOnuÇ: Çalışmada diseksiyonla posterior komissür'ün frontotemporooksipitopontin bağlantısı gösterilmiştir. Araştırma posterior komissür'ün lif bağlantılarını ortaya koyacak insan kadavra çalışmalarıyla desteklenmelidir.

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“…Parts of myelinated nerve fibres located at the lower and left hand edges were included in the counting, whereas those at the upper and right hand edges were not recorded [12][13][14]. From every specimen, one semi-thin section was taken by the ultramicrotome.…”

Section: Quantitative Analysismentioning

confidence: 99%