Distribution of neuropeptide-containing nerve fibers in the human submandibular gland, with special reference to the difference between serous and mucous acini

1997 ◽  
Vol 288 (1) ◽  
pp. 25-31 ◽  
Author(s):  
Tatsumi Kusakabe ◽  
Hideki Matsuda ◽  
Tadashi Kawakami ◽  
Noriko Syoui ◽  
Katsuyoshi Kurihara ◽  
...  
Keyword(s):  
Special Reference ◽  
Submandibular Gland ◽  
Nerve Fibers ◽  
The Difference

Anatomic patterning in the expression of vestibulosympathetic reflexes

2000 ◽  
Vol 279 (1) ◽  
pp. R109-R117 ◽  
Author(s):  
I. A. Kerman ◽  
B. J. Yates ◽  
R. M. McAllen
Keyword(s):  
Relative Proportion ◽  
Vestibular Stimulation ◽  
Nerve Fibers ◽  
Spike Shape ◽  
The Face ◽  
Nerve Fascicle ◽  
The Difference ◽  
Vestibulosympathetic Reflexes

To investigate the possibility that expression of vestibulosympathetic reflexes (VSR) is related to a nerve's anatomic location rather than its target organ, we compared VSR recorded from the same type of postganglionic fiber [muscle vasoconstrictor (MVC)] located at three different rostrocaudal levels: hindlimb, forelimb, and face. Experiments were performed on chloralose-anesthetized cats, and vestibular afferents were stimulated electrically. Single MVC unit activity was extracted by spike shape analysis of few-fiber recordings, and unit discrimination was confirmed by autocorrelation. Poststimulus time histogram analysis revealed that about half of the neurons were initially inhibited by vestibular stimulation (type 1 response), whereas the other MVC fibers were initially strongly excited (type 2 response). MVC units with types 1 and 2 responses were present in the same nerve fascicle. Barosensitivity was equivalent in the two groups, but fibers showing type 1 responses fired significantly faster than those giving type 2 responses (0.29 ± 0.04 vs. 0.20 ± 0.02 Hz). Nerve fibers with type 1 responses were most common in the hindlimb (21 of 29 units) and least common in the face (2 of 11 units), the difference in relative proportion being significant ( P < 0.05, χ2 test). These results support the hypothesis that VSR are anatomically patterned.

Redescription of the giant mud worm Paraleonnates uschakovi Khlebovich and Wu, 1962 (Polychaeta: Nereididae) with special reference to the synonymy of Periserrula leucophryna Paik, 1977 and the difference from Paraleonnates bolus (Hutchings and Reid, 1991)

Zootaxa ◽  
2012 ◽  
Vol 3490 (1) ◽  
pp. 49 ◽  
Author(s):  
JAE-SANG HONG ◽  
BYUNG-MEE CHOI ◽  
AKI KUBO ◽  
MASANORI SATO
Keyword(s):  
Special Reference ◽  
Junior Synonym ◽  
Monotypic Genus ◽  
Type Specimens ◽  
Taxonomic Confusion ◽  
The Difference

There has been a long-standing taxonomic confusion over the name of a giant nereidid worm living in Asian intertidalmud flats. To clear up the confusion, we examined the type specimens of Paraleonnates uschakovi Khlebovich and Wu,1962 described from China as well as Periserrula leucophryna Paik, 1977 described from Korea (Polychaeta: Nereididae),together with additional non-type materials newly collected from Korea, China, Taiwan, and Thailand. Our results con-firmed that Periserrula leucophryna should be reduced to a junior synonym of Paraleonnates uschakovi as previouslynoted, and that this species is widely distributed in Asia, newly recorded from Taiwan and Thailand. We also present newinformation about the arrangement of three kinds of chaetae in the parapodia as a characteristic of this species. We alsocompared this species with Paraleonnates bolus (Hutchings and Reid, 1991) described from Australia and concluded thatthese are different species. Based on our examination, we propose the amended diagnosis of the genus ParaleonnatesKhlebovich and Wu, 1962. Paraleonnates Amoureux, 1985 erected as a monotypic genus for P. guadalupensis Amoureux,1985 was judged as a junior homonym of Paraleonnates Khlebovich and Wu, 1962, and P. guadalupensis is transferred to the genus Leonnates Kinberg, 1865.

Small and large cutaneous fibers display different excitability properties to slowly increasing ramp pulses

2020 ◽  
Vol 124 (3) ◽  
pp. 883-894
Author(s):  
Jenny Tigerholm ◽  
Tatiana Nielson Hoberg ◽  
Dorthe Brønnum ◽  
Mette Vittinghus ◽  
Ken Steffen Frahm ◽  
...  
Keyword(s):  
Ion Channels ◽  
Computational Modeling ◽  
Nerve Fibers ◽  
Perception Threshold ◽  
Voltage Gated ◽  
Tracking Technique ◽  
Threshold Tracking ◽  
Electrical Pulses ◽  
The Difference ◽  
Voltage Gated Ion Channels

When large nerve fibers are stimulated by long, slowly increasing electrical pulses, interactive mechanisms counteract the stimulation, which is called accommodation. The perception threshold tracking technique was able to assess accommodation in both small and large fibers. The novelty of this study is that large fibers displayed accommodation, whereas small fibers did not. Additionally, the difference in accommodation between the fiber could be linked to expression of voltage-gated ion channels by means of computational modeling.

scholarly journals Impact of submandibular gland preservation in neck management of early-stage buccal squamous cell carcinoma on locoregional control and disease-specific survival

BMC Cancer ◽  
2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Bo Gu ◽  
Qigen Fang ◽  
Yao Wu ◽  
Wei Du ◽  
Xu Zhang ◽  
...  
Keyword(s):  
Squamous Cell Carcinoma ◽  
Lymph Node ◽  
Cell Carcinoma ◽  
Neck Dissection ◽  
Submandibular Gland ◽  
Squamous Cell ◽  
Locoregional Control ◽  
Disease Specific Survival ◽  
The Difference ◽  
Disease Specific

Abstract Background The feasibility of submandibular gland (SMG) preservation in oral squamous cell carcinoma (SCC) has occasionally been analyzed, but the differences in survival associated with the presence or absence of SMG preservation remain unknown. We aimed to prospectively evaluate the oncologic results of SMG preservation in cT1-2 N0 buccal SCC. Methods This was a prospective, non-randomized cohort study. Patients with surgically treated cT1-2 N0 buccal SCC were prospectively enrolled and divided into two groups based on the management of the SMG. Level 1b lymph nodes were categorized into six groups based on the positional relationship between the lymph node and the SMG. The main study endpoints were locoregional control (LRC) and disease-specific survival (DSS). Results A total of 31 of the 137 included patients underwent SMG-sparing neck dissection. Patients with SMG preservation were likely to be young persons. Superior metastasis occurred in 11 patients with a prevalence of 8.0%, followed by an anterior metastasis rate of 5.1%, and no metastases developed deeply or within the SMG. The 5-year LRC rates in the SMG-sparing and SMG-excision groups were 74 and 75%, respectively, and the difference was not significant (p = 0.970). The 5-year DSS rates in the SMG-sparing and SMG-excision groups were 74 and 69%, respectively, and the difference was not significant (p = 0.709). Conclusions SMG involvement was rare, and the superior group carried the highest risk for lymph node metastasis. SMG-sparing neck dissection is selectively suggested in cT1-2 N0 buccal SCC patients, and could avoid postoperative asymmetric appearance and dry mouth.

scholarly journals THE POSTSPIKE POSITIVITY OF UNMEDULLATED FIBERS OF DORSAL ROOT ORIGIN

1958 ◽  
Vol 41 (4) ◽  
pp. 613-632 ◽  
Author(s):  
Herbert S. Gasser
Keyword(s):  
Action Potential ◽  
Dorsal Root ◽  
Nerve Fibers ◽  
Positive Potential ◽  
Apparent Increase ◽  
C Fibers ◽  
Large Size ◽  
New Findings ◽  
Supernormal Period ◽  
The Difference

The positivity following the spike in the action potential of unmedullated nerve fibers of dorsal root origin (d.r.C) has been shown to be homologous with the first positive potential (P1) of other varieties of nerve fibers. Thus it is only through the large size of the positivity that this group of nerve fibers is set apart from other groups. New findings accentuate and make more explicit the difference of d.r.C fiber behavior from that of the sympathetic unmedullated fibers. Support of the conclusion is derived from re-examination of the A fibers as well as from observations on the d.r.C fibers. Increase in size of the P1's in a tetanus of the d.r.C fibers can occur if the frequency is high enough; and it does not occur in an A fiber tetanus if the frequency is low enough. Frequency is also critical in the obtainment of increasing P1's in a tetanus of sympathetic C fibers. Decrease in the size of the P1's in the course of a tetanus is attributable to development of the negative after-potential (N a-p). In rested d.r.C fibers the N a-p is latent. But it appears during a tetanus, develops in size, and after the tetanus leads to a long lasting and clearly defined second positive potential. Absence of a supernormal period during the N a-p of the d.r.C fibers is accounted for. An analysis is made of the apparent increase in size of the spike elevations during a tetanus, for the two subgroups of the C fibers. The difference between the after-potentials of A fibers and of sympathetic C fibers is correlated with the shapes of the curves of cathodal electrotonus of these fibers.

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