What's the difference between retinula and surround?
Retinula
Definition:
(n.) One of the group of pigmented cells which surround the retinophorae of invertebrates. See Illust. under Ommatidium.
Example Sentences:
(1) A tapetum or basal retinula cells are not developed.
(2) 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).
(3) A calculation of the theoretical field size of individual retinula cells from measurments of refractive index and lens dimensions predicts that cells which participate in the central rhabdom will have acceptance angles near 3 degrees.
(4) The proximal pigment is found only in retinula cells.
(5) At high but not at low response levels, the critical duration is significantly longer in eccentric cells than in retinula cells.
(6) All retinula cells run the entire length from the cone to the basal lamina, although two, called the proximal cells, only contribute to the lowest third of the rhabdom, and one of either cell 6 or cell 7 on our arbitrary numbering system forms its axon one third the way up the ommatidium.
(7) The position of three cone cell processes (cone threads) is almost invariable with respect to numbered retinula cells but the remaining threads can take any of three intercellular locations.
(8) Probable peroxisomes were also present in the peripheral retina of the eye, including in retinular (retinula) and pigment cells, but there were very few of them.
(9) The retinula cell nuclei lie on the proximal side of the heavily pigmented basement membrane.
(10) The remaining retinula cells 7, 8 and 9 have long fibres.
(11) Each visual unit (ommatidium) of the compound eye of the honey bee contains nine retinula cells, six of which end as axons in the first synaptic ganglion, the lamina, and three in the second optic ganglion, the medulla.
(12) A technique allowing light- and electron microscopy to be performed on the same silver-impregnated sections has made it possible to follow all types of retinula axons of one ommatidium to their terminals in order to study the shape of the terminal branches with their position in the cartridge.
(13) Moreover, while retinula photoreceptor innervation is initially required for the development of normal optic ganglia, the ablation of these cells in midpupation has no discernible effect.
(14) Each ocellus has about 80 retinula cells whose axons project to corresponding ganglia from which 4 giant afferent interneurons (per ganglion) project to the brain.
(15) Four types of monopolar cells L1-L4 are classified; their branching patterns seem to be correlated to the splitting and termination of retinula cell axons.
(16) Six retinula cells course distally to screen two sides of the crystalline cone.
(17) The retinula cells are connected together by a desmosomal strip along their length.
(18) The synaptoid junctions are characterized by postsynaptic electron-dense material on the inner leaflet of the retinula cell membrane and, frequently, presynaptic submembranous dense material.
(19) No significant binding was observed to the outer plasma membrane of the retinula cells, or in any other part of the retina.
(20) In it lie the very large oval nuclei of the seven retinula cells.
Surround
Definition:
(v. t.) To inclose on all sides; to encompass; to environ.
(v. t.) To lie or be on all sides of; to encircle; as, a wall surrounds the city.
(v. t.) To pass around; to travel about; to circumnavigate; as, to surround the world.
(v. t.) To inclose, as a body of troops, between hostile forces, so as to cut off means of communication or retreat; to invest, as a city.
(n.) A method of hunting some animals, as the buffalo, by surrounding a herd, and driving them over a precipice, into a ravine, etc.
Example Sentences:
(1) Such was the mystique surrounding Rumsfeld's standing that an aide sought to clarify that he didn't stand all the time, like a horse.
(2) The lesion (10.6 X 9.8 mm) was a well-defined ellipsoid granuloma due to a foreign body with a central zone of necrosis surrounded entirely by a fibrous wall.
(3) It was hypothesized that compensatory restraining influences of surrounding soft tissues prevented a more severe facial malformation from occurring.
(4) Their receptive fields comprise a temporally and spatially linear mechanism (center plus antagonistic surround) that responds to relatively low spatial frequency stimuli, and a temporally nonlinear mechanism, coextensive with the linear mechanism, that--though broad in extent--responds best to high spatial-frequency stimuli.
(5) "I was eight in 1983, but I remember a plane that flew low over our Bulawayo suburb and army loud-hailers screaming: 'You are surrounded.'
(6) The usefulness of the proposed method is obvious in cases where the composition of a precipitate on LM scale is to be compared with the LM appearance of the surrounding tissue.
(7) Degraded visual acuity had a significant effect on cadence, foot placement, and foot clearance, but visual surround conditions did not.
(8) Computed tomography does not allow differentiation between these lesions and surrounding normal tissues.
(9) The efficacy of the process is dependent on immersion medium, while the degree of surrounding tissue damage is dependent on energy dose.
(10) In cat, DARPP-32-immunoreactive cell bodies identified as Müller cells were demonstrated in the inner nuclear layer (INL) with processes closely surrounding the cell soma of photoreceptors in the outer nuclear layer.
(11) In the univariate life-table analysis, recurrence-free survival was significantly related to age, pTNM category, tumour size, presence of certain growth patterns, tumour necrosis, tumour infiltration in surrounding thyroid tissue and thyroid gland capsule, lymph node metastases, presence of extra-nodal tumour growth and number of positive lymph nodes, whereas only tumour diameter, thyroid gland capsular infiltration and presence of extra-nodal tumour growth remained as significant prognostic factors in the multivariate analysis.
(12) Surrounding intact ipsilateral structures are more important for the recovery of some of the language functions, such as motor output and phonemic assembly, than homologous contralateral structures.
(13) The dual-probe system incorporates a central collimated probe for monitoring activity in the LV surrounded by an annular detector collimated in such a manner as to provide simultaneous real-time monitoring of the LV background activity.
(14) This technique is sensitive to the optical anisotropy within the muscle, including that due to intrinsic properties of the protein molecules as well as that due to the regular arrangement of proteins in the surrounding medium.
(15) Surrounding parenchyma may be partially compressed.
(16) The stage of a given malignancy, representing the degree of spread of the tumor to its local surroundings or distant sites, is the best predictor of long-term survival.
(17) At this stage of the observation period the labeling index was very low in surrounding liver, but still high in the gamma-glutamyltranspeptidase-positive areas.
(18) The third effect was a shift in center-surround balance towards a more dominant center.
(19) Although sound pressure levels are high, they are probably reduced before reaching the cochlea of the fetus because of the surrounding amniotic fluid and the fluid in the middle ear.
(20) Glial siphoning can distribute the potassium preferentially toward the blood vessels in the area, leading to an elevation in potassium concentration in the ECF surrounding the vascular smooth muscle of the arterioles.