(1) Four of these are numerous (retinula axons symapsing onto thick ocellar nerve fibres or onto thin ocellar fibres; thin ocellar nerve fibres synapsing onto thick ocellar nerve fibres or onto other thin ocellar fibres).
(2) Direct interactions between the ocelli and compound eyes are suggested by the projections of small ocellar interneurons into the proximal lobula.
(3) The central projections of the ocellar nerves from the intracranial ocelli also exhibit histamine-like immunoreactivity.
(4) The overall synaptic configurations are discussed in terms of the varied response characteristics of units in the ocellar nerve.
(5) The projections of ocellar fibres within the brain and thorax of the honey bee, Apis mellifera, were established using a modified cobalt sulphide technique, supplemented by serial sectioning of the brain for the light microscope.
(6) Electrophysiological recordings confirm the hyperpolarizing and localized action of histamine onto dendrites of second-order neurons in the ocellar cup.
(7) In addition to duplications of cuticular epithelia, extra glial cells, muscle fibers, and ocellar interneurons are sometimes found in extra-eye bearing flies.
(8) These results suggest that locust ocellar photoreceptors contain histamine and release it upon depolarization.
(9) Ocellar-mediated postsynaptic potentials influenced the firing of thoracic interneurons only if they arrived during the proper phase of rhythmic drive.
(10) There are 17 large 1st-order ocellar interneurons (Figs.
(11) rdgBKS222 and rgdAPC47 mutants are essentially normal with respect to structure and survival of ocellar receptors and synapses.
(12) The ocellar potential (OP) of planaria was recorded using microelectrode techniques.
(13) The small lateral ocellar neurons associated with these arborizations have cell bodies adjacent to the lateral ocellar tracts.
(14) It is present at high levels only in photoreceptor cell terminations, glomerulae of the antennal lobes, and the ocellar retina.
(15) All deltex alleles behave as recessive viables affecting wing, ocellar and eye morphology.
(16) Immunoreactivity of different intensity is found in the non-glomerular neuropil around the mushroom bodies, in the lateral protocerebrum, the central body, the optic tubercles, the lobula and medulla of optic lobe, the ocellar neuropil, in multiglomerular elements of the antennal lobes and in the dorsal deuterocerebrum.
(17) This collateral arborizes almost immediately in a region receiving input from arborizations of a number of small ocellar neurons (those less than 5 micrometer in diameter) from the ipsilateral ocellar nerve, together with small neurons from the median ocellar nerve, forming a region in each half of the brain which receives input from all three ocelli.
(18) No ocellar processes appear to be given off to the corpora pedunculata, central body, nervi corporis cardiaci, antennal lobes, or circumesophageal connectives; it is uncertain whether ocellar collaterals extend into the protocerebral bridge or optic lobes.
(19) Within each half of the posterior neuropil, two spatially separated regions of ocellar input have been identified.
(20) Anatomically, the sensory cells of the dorsal ocellus of Tenodera were determined histologically to be grouped into two distinct regions, each group making its own separate contribution to the ocellar nerve.
Ocelli
Definition:
(pl. ) of Ocellus
Example Sentences:
(1) Direct interactions between the ocelli and compound eyes are suggested by the projections of small ocellar interneurons into the proximal lobula.
(2) A length of 165 X 10(3) base-pairs of contiguous DNA that spans polytene chromosome region 35A4 to 35B1 and includes the structural gene for alcohol dehydrogenase (Adh) as well as at least two other genes, outspread (osp) and no-ocelli (noc), has been characterized by mapping chromosome aberrations to the DNA.
(3) The central projections of the ocellar nerves from the intracranial ocelli also exhibit histamine-like immunoreactivity.
(4) Studies of the dorsal ocelli of the wasp Paravespula vulgaris (L.) led to the following results: Under a biconvex corneal lens, 150 microns in thickness, about 600 receptor cells are located.
(5) The predicted otd protein contains a well-conserved homeo domain and is therefore likely to be a transcriptional regulator involved in specifying cell fate both in the embryonic CNS and in the ocelli.
(6) Size, details of internal anatomy, and the presence of 8 ocelli on the posterior sucker distinguish it from the 3 other species in North America.
(7) The majority of mutations block the pigmentation of four organs; the normally pigmented eyes and ocelli, and ectopically pigmented tubules and fat body.
(8) This collateral arborizes almost immediately in a region receiving input from arborizations of a number of small ocellar neurons (those less than 5 micrometer in diameter) from the ipsilateral ocellar nerve, together with small neurons from the median ocellar nerve, forming a region in each half of the brain which receives input from all three ocelli.
(9) These results suggest that light receptors in these planaria might have evolved away from the body surface and are located in the ocelli.
(10) Using internally marked mosaics, we find that the pacemaker is located in brain but is not exclusive to the eyes, the ocelli, or the optic lobes, which is consistent with previous reports obtained in this and other insects of this class.
(11) The receptor cells of compound eyes, ocelli, and antennae were not labelled.
(12) Small ocelli (20 micron in diameter) with less than 100 cells in the newly hatched nymph become adult ocelli (more than 500 micron in diameter) with more than 10,000 retinular cells, through ten to 11 nymphal stages.
(13) The ocelli of Periplaneta americana were studied by light and electron microscopy.
(14) Transfer characteristics of the synapse made from second- to third-order neurons of cockroach ocelli were studied using simultaneous microelectrode penetrations and the application of tetrodotoxin.
(15) Unit responses to olfactory and mechanical stimuli of the antennae, and illumination of the ocelli, were recorded extracellularly in the protocerebrum of the honey-bee.
(16) They respond physiologically to deviations from the normal flight posture mediated by ocelli, eyes and wind hairs and connect to the thoracic flight apparatus.
(17) Small cell arborizations from all three ocelli are distributed actoss much of the protocerebral bridge, implying a role for the bridge as an ocellar neuropil within the brain.
(18) A pigment extract of 1000 barnacle ocelli prepared under dim, red light had a maximum absorbance change at 480 nm when bleached with blue-gree light.
(19) Mutations at 5 loci affect pigmentation of a subset of organs: cd and po affect only the eyes and ocelli; kar affects the eyes, ocelli and fat body; car causes excretion of pigment from tubules; and z affects pigmentation of the eyes alone.
(20) Male scale insects of an undescribed Australian species of Eriococcus have no compound eyes but show an extraordinary arrangement of three pairs of ocelli: One pair is positioned dorsolaterally where most insects have their compound eyes.