(1) If a cercus is rotated and grafted back into its own socket, it back-rotates towards its original orientation in succeeding molts.
(2) (2) It was also observed that the projection of cercal sensory fibers in specimens reared with a single cercus differed from normal in that scattered fibers cross the midline in regions of the ganglion where none usually exist.
(3) Both of these interneurons receive excitatory synaptic input from the sensory cells of the nine most prominent columns (a, d, g, f, h, i, k, l, and m) of filiform hairs of the ipsilateral cercus.
(4) The interneurons of three groups of animals were examined; control specimens which were not treated surgically, unilaterally treated specimens which had a single cercus removed and bilaterally treated specimens which had both cerci removed.
(5) The principal afferent input to two identified interneurons was removed by surgically ablating an abdominal sensory appendage, the cercus.
(6) This is due in part to faciliation of an inhibitory synaptic input which is activated by the control cercus.
(7) The most obvious correlate of arbor type is the circumferential position of the hair on the cercus.
(8) It was found that 3 neurons from this system receive the main bulk of excitatory impulsation from the ipsilateral cercus, and only 1 of them--from the contralateral one.
(9) This continuing flexibility of the axonal arbor could also be demonstrated by allowing the amputated cercus to regenerate (Figs.
(10) Passive movements of a cercus, monitored with a position transducer, show that the PAD unit fires discrete bursts during cercal displacement.
(11) The wild-type cercus has two hairs, one lateral (L) and the other medial (M), each with an underlying sensory neuron.
(12) The cercus of the first instar cockroach, Periplaneta americana, bears two filiform hairs, lateral (L) and medial (M), each of which is innervated by a single sensory neuron.
(13) Signal processing in the proposed neural circuit is equivalent to the signal direction estimation by projecting the vector of velocity on the two stable basic directions whose orientations do not change when symmetrical changes in cercus positions occur.
(14) When axons of the sensory neurons were transected during larval development, the cell bodies and the soma-bearing portion of axons, which are located within the cercus, survived but lost their excitability for 9-10 days.
(15) Column "h" afferents were chosen because they make a large contribution to the receptive fields of GIs 1 and 2 after ablation of the contralateral cercus.
(16) The major input to these GIs is from the cercus on the axon side; when this cercus is ablated in the last instar before the adult stage, input from the other cercus becomes more effective within 30 days (Vardi and Camhi, 1982b).
(17) Neural activity in the cercal-to-giant interneurone system was lowered by blocking the movement of the mechanosensitive hairs, located on each cercus, with a facial cleansing cream.3.
(18) First, they had directional sensitivities which were appropriate to their location on the cercus; receptors of this directionality would never be made by the donor tissue if left in its original position.
(19) We have discovered mutant animals that have more hairs on the cercus; the most typical phenotype, called "Space Invader" (SI), has an extra filiform hair in a proximo-lateral position on one of the cerci.
(20) An attempt is made to relate the distribution of filiform hairs on the cercus of the second instar cockroach, Periplaneta americana, to the morphology and patterns of synaptic connectivity of their afferents.
Sensory
Definition:
(a.) Of or pertaining to the sensorium or sensation; as, sensory impulses; -- especially applied to those nerves and nerve fibers which convey to a nerve center impulses resulting in sensation; also sometimes loosely employed in the sense of afferent, to indicate nerve fibers which convey impressions of any kind to a nerve center.
Example Sentences:
(1) Symptomatic improvement was obtained in 14 of the 15 hands, and sensory-evoked response improved in 13 hands.
(2) The earliest degenerative changes were seen in sensory and motor terminals at 20-24 h after the lesion.
(3) We assumed that the sensory messages received at a given level are transformed by a stochastic process, called Alopex, in a way which maximizes responses in central feature analyzers.
(4) These later results suggest that dopamine agonists increase sensorimotor reactivity measured with acoustic startle by acting on sensory rather than motor parts of the reflex arc.
(5) Sensory loss, motor weakness, paraesthesia and a new pain were found as complications in 12, 7, 4 and 6 patients, respectively.
(6) Of 533 myelinated sensory fibers, the size range was 2 micron.
(7) We have investigated the temporal pattern of appearance, cell lineage, and cytodifferentiation of selected sensory organs (sensilla) of adult Drosophila.
(8) These results suggest that, to fully understand how multijoint movement sequences are controlled by the nervous system, sensory mechanisms must be considered in addition to central mechanisms.
(9) The peptide selectively inhibits certain postsynaptic cells but not others and thereby allows the sensory neurons to achieve target-specific synaptic actions.
(10) This contrasts sharply with the reduction in both the frequency and surface area of sensory neuron active zones that accompanies long-term habituation, and suggests that modulation of active zone number and size may be an anatomical correlate that lies in the long-term domain.
(11) We report that kainic acid lesions of the posterior corpus striatum, which preferentially spare fibers of passage while destroying striatopallidal neurons, produce a stimulus-sensitive movement pattern in rats that has a highly specific sensory trigger.
(12) We conclude that the procedure used in this study is a non-intrusive intervention that is an extension of the current literature pertaining to sensory extinction.
(13) Using serial-sectioning techniques for conventional transmission and high-voltage electron microscopy, we characterized the ultrastructural features and synaptic contacts of the sensory cell in tentacles of Hydra.
(14) From the area between the papillae sensory endings appearing in sections to be either single, double or triple are described.
(15) This unbearable situation leads to panic and auto-sensory deprivation.
(16) The record includes postoperative drawings of the intraoperative field by Dr. Cushing, a sketch by Dr. McKenzie illustrating the postoperative sensory examination, and pre- and postoperative photographs of the patient.
(17) The first spinal nerve and the spinal accessory nerve (XI) have no sensory projections, but the second spinal nerve has typical projections along the dorsal funiculus of the spinal cord.
(18) After 7 days, various stages of sensory hair degeneration could be observed.
(19) It appears that tricyclic antidepressants act in a fashion different from opiate drugs that alter the sensory discriminative component of pain.
(20) These connections may provide a pathway for overlap of sensory dermatomes and motor innervation of the neck and upper extremity.