Giant choroidal cells in the lamprey eye (Petromyzon marinus L.)

Dickson, D. Howard; Graves, Debra A.

doi:10.1016/0014-4835(81)90035-x

Cited by 2 publications

(3 citation statements)

References 10 publications

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“…The present study demonstrates that iron deposits previously reported in the meninges of the spinal cord and brain of larvae (Hall and Youson, 1988) and juveniles (Youson and Cheung, 1987) of the sea lamprey Petromy zon marinus are localized within cells scattered throughout this tissue. The cells are similar to those referred to as "round cells" in the meninges of the brain and spinal cord of larvae and adult lampreys (Rovainen et al, 1971) and as "giant choroidal cells" in the choroid of the eye in adult lampreys (Dickson and Graves, 1981). These cells had received previous attention because of the large glycogen stores in their cytoplasmic matrices.…”

Section: Discussionmentioning

confidence: 68%

“…Round cells are the probable site of glucose production from the stored glycogen, and their location is significant with regard to supplementing brain metabolism, particularly in times of stress (Rovainen, 1970;Rovainen et al, 1971). The absence of glycogen-rich, giant choroidal cells in larval lampreys is related to the immaturity of the eye at this period of the life cycle (Dickson and Graves, 1981).…”

Section: Discussionmentioning

confidence: 99%

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Iron and aluminum deposition in the meninges of the lamprey: Identification of an aluminum‐ferritin inclusion body

1989

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The meningeal tissue of the brain and spinal cord of larval and juvenile adults of lampreys (Petromyzon marinus) was examined by routine electron microscopy, electron microscopic histochemistry, and electron-probe x-ray microanalysis to locate sites of iron deposition. A magnetometer was used for identification of ferromagnetic iron. Ferritin particles, representing ferric iron, are present in abundance within the cytoplasmic matrices and in dense bodies of meningeal cells of both the brain and spinal cord of larvae and juveniles. These round cells of the meninges also contain abundant glycogen and lipid. Small quantities of ferrous iron are associated to the latter inclusion. Aluminum deposits are present within an electron-dense material of many ferritin-containing inclusions of meningeal cells of the larval brain. Ferromagnetic material was not detected in larval and upstream-migrant lampreys. The deposition of iron and aluminum in the meninges of lampreys may be related to physiological and environmental factors, respectively, and/or to an important interaction between the two metals.

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Section: Discussionmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 99%

Iron and aluminum deposition in the meninges of the lamprey: Identification of an aluminum‐ferritin inclusion body

1989

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“…The choroidal pigment of both developmental stages was the most dense in the posterior pole of the eye. Choriocapillaris vessels and choroidal storage cells are known to undergo considerable change during an adult lamprey's life span (Dickson and Graves, 1981b).…”

Section: Retinal Pigment Epithelium (We) the Rpementioning

confidence: 99%

Review of larval and postlarval eye ultrastructure in the lamprey (cyclostomata) with special emphasis onGeotria australis (gray)

Meyer‐Rochow

Stewart

1996

Microsc. Res. Tech.

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The literature dealing with the lateral eye in lampreys is briefly reviewed here. While there appears to be no longer much doubt that the short and long photoreceptor cells in the lamprey eye correspond to rods and cones, questions of dark/light adaptational changes, the nature of visual pigments, and the roles of retinal serotonin and melatonin need to be re‐addressed. Eyes of the larval and postlarval (“macrophthalmia”) stages of the lamprey Geotria australis were examined by electron microscopy and it was found that the larval retina is largely undifferentiated except for a small central zone surrounding the optic nerve head. The retina of the postlarval stage is fully differentiated and the photoreceptor outer segments undergo renewal, which appears to involve the retinal pigment epithelium (RPE). The distribution of larval RPE and choroidal pigments, postlarval ganglion cells, and the orientation of scleral collagen are unusual for vertebrates. No obvious positional or size differences of any retinal cell type were apparent between day‐ and night‐fixed specimens. © 1996 Wiley‐Liss, Inc.

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Giant choroidal cells in the lamprey eye (Petromyzon marinus L.)

Cited by 2 publications

References 10 publications

Iron and aluminum deposition in the meninges of the lamprey: Identification of an aluminum‐ferritin inclusion body

Iron and aluminum deposition in the meninges of the lamprey: Identification of an aluminum‐ferritin inclusion body

Review of larval and postlarval eye ultrastructure in the lamprey (cyclostomata) with special emphasis onGeotria australis (gray)

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