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![A study of labyrinthine and neck reflexes in the decerebrate cat için kapak resmi A study of labyrinthine and neck reflexes in the decerebrate cat için kapak resmi](/client/assets/d79c3e4af2b6d196/ctx/images/no_image.png)
A study of labyrinthine and neck reflexes in the decerebrate cat
Başlık:
A study of labyrinthine and neck reflexes in the decerebrate cat
Yazar:
Lindsay, Kenneth W., author.
ISBN:
9780438058200
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (232 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 76-08C.
Advisors: T. D.M Roberts.
Özet:
The purpose of the first part of the present study was to re-examine the action and interaction of labyrinthine and neck reflexes on a single extensor muscle in the forelimb of the decerebrate cat. Experiments, were performed on decerebrate cats in which the first and second cervical roots had been sectioned on each side. During head rotation, the axis vertebra was clamped, thus providing a pure vestibulacr input to the limb musculature. Conversely the axis vertebra was rotated while the head remained fixed. Thus only the receptors in the joints innervated by the remaining intact cervical nerves were stimulated. The medial head of triceps was dissected, out and attached to a compliant puller. A change in muscle activity was recorded as either a change in length or a change in the firing. frequency of single motor units. Side-down rotation of the head around an anterior-posterior axis was shown to consistently increase the activity of the ipsilateral medial head of triceps and to decrease the activity of the contralateral muscle. Side-down rotation of the axis vertebra was shown to consistently decrease the activity in the ipsilateral medial head of triceps and to increase the activity in. the contralateral muscle. The characteristics of each reflex response were studied in detail. It is concluded that labyrinthine and neck reflexes both act asymmetrically, but in the opposite sense on the forelimb extensor muscle. As might have been expected from the above, when a side-down rotation of the head was superimposed on a side-down rotation of the neck (or vice-versa;, the activity in the muscle returned to a value close to that seen prior to the change in head or neck position. Head rotation in a decerebrate preparation in which all the cervical roots were intact, produced no detectable change in the muscle activity. By using a technique of selective nerve section, it was found that both the first and second cervical roots were important in transmitting neck reflex activity. The results, in the first section of the thesis thus contradict Magnus's account of symmetrical labyrinthine reflexes and confirm and extend Roberts's preliminary observations of asymmetric labyrinthine reflexes. Magnus's account of the tonic reflexes is confirmed: and extended by demonstrating neck reflex action on a single extensor muscle. The results demonstrating the interaction of neck and labyrinthine reflexes, support Poberts's hypothesis of postural stabilization in intact animals. An alternative scheme of postural reflexes is put forward taking into account the fact that the labyrinths may influence the neck muscles.
Notlar:
School code: 0547
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(684656.1) | 684656-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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