AIRFLOW SENSORS IN THE AVIAN WING

1993 ◽  
Vol 179 (1) ◽  
pp. 13-30 ◽  
Author(s):  
R. E. Brown ◽  
M. R. Fedde
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Sensory Input ◽  
Separation Point ◽  
Discharge Frequency ◽  
Airflow Velocity ◽  
Discharge Characteristics ◽  
Distal Half ◽  
The Central Nervous System ◽  
Stimulation Of

Mechanoreceptors on or near feather follicles in the wings of birds may provide information about airflow over the wing. We studied discharge characteristics of rapidly and slowly adapting mechanoreceptors associated with propatagial covert feathers, slowly adapting receptors within the alular joint and vibration-sensitive receptors of filoplume follicles attached to the follicles of secondary flight feathers during manual feather movements and during airflow over the wing. Dorsal elevation of covert feathers produced an increase in discharge frequency related to the angle of elevation. Extension of the alula produced an increase in discharge frequency related to the angle of extension. Stimulation of receptors located on the distal half of the follicles of secondary flight feathers by airflow over the wing produced a continuous discharge whose frequency correlated with airflow velocity. There is thus abundant sensory input from the wing to the central nervous system. We conclude that birds have the necessary sensor-feather mechanisms in the wing (1) to detect an imminent stall and the location of the separation point of the airflow from the wing's surface, and (2) to measure airspeed by detecting the frequency of vibration of the secondary flight feathers.

scholarly journals Issues Impairing the Success of Neural Implant Technology

2006 ◽  
Vol 3 (4) ◽  
pp. 297-304
Author(s):  
A. Spiers ◽  
K. Warwick ◽  
M. Gasson ◽  
V. Ruiz
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Sensory Input ◽  
Potential Problem ◽  
Neural Tissue ◽  
Neural Implant ◽  
Nervous System Activity ◽  
The Central Nervous System ◽  
The Individual ◽  
Stimulation Of

By monitoring signals from the central nervous system, humans can be provided with a novel extra channel of communication that can, for example, be used for the voluntary control of peripheral devices. Meanwhile, stimulation of neural tissue can bring about sensation such as touch, can facilitate feedback from external, potentially remote devices and even opens up the possibility of new sensory input for the individual to experience. The concept of successfully harnessing and stimulating nervous system activity is though something that can only be achieved through an appropriate interface. However, interfacing the nervous system by means of implant technology carries with it many problems and dangers. Further, results achieved may not be as expected or as they at first appear. This paper describes a comparative study investigating different implant types and procedures. It is aimed at highlighting potential problem areas and is intended to provide a useful reference explaining important tolerances and limits.

scholarly journals VI. —Anaphylaxis and anaphylatoxins

1923 ◽  
Vol 211 (382-390) ◽  
pp. 273-315 ◽  
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Guinea Pig ◽  
Anaphylactic Shock ◽  
The Body ◽  
Muscle Fibres ◽  
Direct Stimulation ◽  
Fundamental Conception ◽  
The Central Nervous System ◽  
Stimulation Of

In the study of the phenomena of anaphylaxis there are certain points on which some measure of agreement seems to have been attained. In the case of anaphylaxis to soluble proteins, with which alone we are directly concerned in this paper, the majority of investigators probably accept the view that the condition is due to the formation of an antibody of the precipitin type. Concerning the method, however, by which the presence of this antibody causes the specific sensitiveness, the means by which its interaction with the antibody produces the anaphylactic shock, there is a wide divergence of conception. Two main currents of speculation can be discerned. One view, historically rather the earlier, and first put forward by Besredka (1) attributes the anaphylactic condition to the location of the antibody in the body cells. There is not complete unanimity among adherents of this view as to the nature of the antibody concerned, or as to the class of cells containing it which are primarily affected in the anaphylactic shock. Besredka (2) himself has apparently not accepted the identification of the anaphylactic antibody with a precipitin, but regards it as belonging to a special class (sensibilisine). He also regards the cells of the central nervous system as those primarily involved in the anaphylactic shock in the guinea-pig. Others, including one of us (3), have found no adequate reason for rejecting the strong evidence in favour of the precipitin nature of the anaphylactic antibody, produced by Doerr and Russ (4), Weil (5), and others, and have accepted and confirmed the description of the rapid anaphylactic death in the guinea-pig as due to a direct stimulation of the plain-muscle fibres surrounding the bronchioles, causing valve-like obstruction of the lumen, and leading to asphyxia, with the characteristic fixed distension of the lungs, as first described by Auer and Lewis (6), and almost simultaneously by Biedl and Kraus (7). But the fundamental conception of anaphylaxis as due to cellular location of an antibody, and of the reaction as due to the union of antigen and antibody taking place in the protoplasm, is common to a number of workers who thus differ on details.

Blood Pressure and Pulse Rate in the Foetal Sheep

1945 ◽  
Vol 22 (1-2) ◽  
pp. 63-74
Author(s):  
JOSEPH BARCROFT ◽  
D. H. BARRON
Keyword(s):  
Blood Pressure ◽  
Central Nervous System ◽  
Nervous System ◽  
Pulse Rate ◽  
Umbilical Artery ◽  
The Central Nervous System ◽  
The Right ◽  
First Moment ◽  
Left Vagus ◽  
Stimulation Of

1. A method (the needle method) is described for the measurement of the pressure in the stream going through a vessel. 2. In the foetal sheep the needle method applied to the umbilical artery gives substantially the same results as the mercurial manometer applied to the carotid, until about half-way through the gestation period. 3. As gestation proceeds the needle method applied at the first moment at which it can be applied to the umbilical artery (or a branch) gives readings substantially lower, and increasingly lower as gestation proceeds, than does the mercurial manometer read at the first moment at which it can be read. 4. The discrepancy is due to the sum of a number of causes which are discussed, but of these the most important is an actual rise of pressure between the time of delivery and the completion of the dissections contingent on the use of the mercurial manometer. 5. The cause of this is not at present demonstrated, but either or both of two factors may be concerned: (a) a dulling of the central nervous system which weakens the depressor reflex; (b) the establishment of a greater degree of vasomotor tone consequent on the bombardment of the central nervous system with sensory stimuli. 6. The pulse rates in utero and just after delivery of the foetus into a saline bath at 39-40°C. (the umbilical circulation being unimpaired) are not significantly different. 7. The pulse rate quickens up to the 70th-80th day, after which it becomes slower as gestation proceeds. 8. If both vagi be severed, the pulse rate te to quicken throughout gestation. The pulse, therefore, comes increasingly under vagus inhibition from the 80th-90th day onwards. 9. Even after the vagi have been cut after the 120th day (it has not been tried before) adrenalin in sufficient quantity will cause a further quickening of the pulse. 10. The earliest date at which stimulation of the peripheral end of the right vagus was observed to slow the heart was the 77th day. On the 85th day peripheral stimulation of the left vagus also failed, but succeeded on the 101st day. 11. Central stimulation of the left vagus, with the right vagus intact, produced slowing on the 77th day. 12. Slowing of the heart synchronous with rise of arterial pressure has been observed on the 111th day. 13. Slowing of the heart which bears evidence of being reflex has been obtained by raising the blood pressure (clamping the cord) on the 121st day and by injection of adrenalin on the 118th day. 14. Approaching term both the carotid sinus and cardiac depressor mechanisms are functional. 15. Lowering of the blood pressure as the result of stimulation of the central end of the vagus and with both vagi severed can be demonstrated late in gestation.

Optical Stimulation of the Central Nervous System In Vitro

2008 ◽  
Author(s):  
Jonathan M. Cayce ◽  
Chris Kao ◽  
Jonathan D. Malphurus ◽  
Peter Konrad ◽  
Duco Jansen ◽  
...  
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Optical Stimulation ◽  
The Central Nervous System ◽  
Stimulation Of

scholarly journals Mechanical loading of a long bone induces plasticity in sensory input to the central nervous system

2009 ◽  
Vol 463 (3) ◽  
pp. 254-257 ◽  
Author(s):  
Qiang Wu ◽  
Susannah J. Sample ◽  
Theresa A. Baker ◽  
Cathy F. Thomas ◽  
Mary Behan ◽  
...  
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Mechanical Loading ◽  
Sensory Input ◽  
Long Bone ◽  
The Central Nervous System

scholarly journals Therapeutic electrical stimulation of the central nervous system

2005 ◽  
Vol 328 (2) ◽  
pp. 177-186 ◽  
Author(s):  
Alim-Louis Benabid ◽  
Bradley Wallace ◽  
John Mitrofanis ◽  
Celine Xia ◽  
Brigitte Piallat ◽  
...  
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Electrical Stimulation ◽  
The Central Nervous System ◽  
Stimulation Of

scholarly journals Deep stimulation in neurosurgery

2019 ◽  
Vol 10 (1) ◽  
pp. 63-71
Author(s):  
Aleksandr A. Kalinkin ◽  
Alexey G. Vinokurov ◽  
Olga N. Kalinkina ◽  
Alexander S. Ilinykh ◽  
Andrey A. Bocharov ◽  
...  
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Deep Brain Stimulation ◽  
High Risk ◽  
Brain Stimulation ◽  
Conservative Therapy ◽  
The Central Nervous System ◽  
The Brain ◽  
Deep Brain ◽  
Stimulation Of

The technique of deep brain stimulation is used to treat patients with various diseases of the central nervous system who are not amenable to conservative therapy, while open interventions in them are associated with a high risk of complications. In the review, we evaluate the efficiency of the deep stimulation of different regions of the brain in some pharmacoresistant forms of diseases.

Sign in / Sign up

Export Citation Format

Share Document