Phylogenetic and Conceptual Aspects of the Subcommissural Organ

The morphohistology and some histochemical aspects of the pineal organ in the sockeye salmon were studied. The distal part of the organ lies in a pineal fossa in the cranial roof. Photosensory cells and two kinds of ependymal supporting cells are present throughout its epithelium, which is entirely devoid of either melanin or lipofuchsin. Besides sensory nerve fibers, efferent end-loops are present on the photosensory as well as the supporting cells. The dorsal pineal nerve tract probably contains both sensory and efferent fibers. The apocrine secretion of sensory as well as some supporting cells is probably associated with either the maintenance of a constant chemical composition of the cerebrospinal fluid or with supply of certain chemical substances to the brain tissue. The secretion in the pineal and the subcommissural organ consists of glycogen, mucopolysaccharides, mucoproteins, and aldehyde fuchsin positive granules.It is proposed that the pineal organ is photosensory as well as secretory and that its photosensitivity might be of some significance in the light-dependent behavior of this species in terms of intensity detection.

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Radioautographic evidence for an innervation of the subcommissural organ by GABA-containing nerve fibres

Journal of Neurocytology ◽

10.1007/bf01262413 ◽

1981 ◽

Vol 10 (3) ◽

pp. 411-424 ◽

Cited By ~ 39

Author(s):

H. Gamrani ◽

M. F. Belin ◽

M. Aguera ◽

A. Calas ◽

J. F. Pujol

Keyword(s):

Subcommissural Organ ◽

Nerve Fibres

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Effect of the Subcommissural Organ and the Pineal Body on the Adrenal Cortex

Endocrinology ◽

10.1210/endo-72-1-28 ◽

1963 ◽

Vol 72 (1) ◽

pp. 28-32 ◽

Cited By ~ 19

Author(s):

MIKLOS PALKOVITS ◽

PETER I. FÖLDVARI

Keyword(s):

Adrenal Cortex ◽

Subcommissural Organ ◽

Pineal Body

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The subcommissural organ ofPodarcis s. siculaRaf. A model for functional studies

Bolletino di zoologia ◽

10.1080/11250008809386620 ◽

1988 ◽

Vol 55 (1-4) ◽

pp. 233-249

Author(s):

Vittorio D'uva ◽

Lorenzo Varano

Keyword(s):

Subcommissural Organ ◽

Functional Studies

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Papillary Tumor of the Pineal Region: MR Signal Intensity Correlated to Histopathology

Case Reports in Neurological Medicine ◽

10.1155/2015/315095 ◽

2015 ◽

Vol 2015 ◽

pp. 1-4

Author(s):

Marcos Rosa Junior ◽

Antonio Jose da Rocha ◽

Adriano Zanon da Silva ◽

Sergio Rosemberg

Keyword(s):

Subcommissural Organ ◽

Pineal Region ◽

World Health ◽

Pineal Tumor ◽

Imaging Diagnosis ◽

Posterior Commissure ◽

Papillary Tumor ◽

The World ◽

T1 Hyperintensity ◽

Health Organization

Tumors of the pineal region are rare and can be challenging to differentiate by imaging. Papillary tumor of the pineal region (PTPR) was recently recognized as a neoplasm in the World Health Organization (WHO) 2007 classification, arising from specialized ependymocytes in the subcommissural organ, which is located in the pineal region. It is a rare histological type of pineal tumor with only a few cases reported. Here, we describe a case of histologically confirmed PTPR in a 17-year-old man who presented with a headache. A literature review was performed to clarify the clinical, radiological, and pathological features of PTPR. Pineal neoplasms do not have pathognomonic imaging findings; however, we discuss T1 hyperintensity, which is a key for imaging diagnosis according to recent reports. In particular, if the hyperintensity in T1 is not due to fat, calcification, melanin, or hemorrhage in a mass of the posterior commissure or pineal region, the diagnosis of a PTPR may be suggested, as observed in this case.

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