| Morphology and Distribution of Motor Neurons in Cat Innervating the Orbicularis Oculi Muscle by Retrograde Horseradish Peroxidase. |
|
Kang Yeoul Lee, Joong Ha Yoo, Beak Ran Song |
|
Department of Ophthalmology, Inha Hospital, Inha University Medical College, #7336 Taepyong-4 dong, Sujung-ku, Songnam, Kyongkido, 461-192, Korea. inhaeye@netsgo.com |
| 고양이의 안면신경핵에서 눈둘레근을 지배하는 운동신경원의 분포 및 형태학적 연구 : Horseradish Peroxidase 를 이용한 역행성 추적연구 |
|
이강열(Kang Yeoul Lee),유중하(Joong Ha Yoo),송백란(Beak Ran Song) |
|
|
|
|
| Abstract |
|
The facial nerve is mainly composed of motor fibers and is distributed to the muscles of facial expressions. In ophthalmology clinics, orbicularis oculi muscle innervated by the facial nerve is involved in spontaneous and voluntary blinking, winking, and more forceful eyelid closure. To understand pathophysiogy of facial nerve palsy due to brain stem lesion involving nucleus, 50% Horseradish Peroxidase (HRP) was injected into nerve stump innervating orbicularis oculi muscle of cat and serial sections of midbrain were studied with light and dark field of light microscope to examine morphology and distribution of the facial nuclei. The HRP-labelled motor neurons were located exclusively within the intermediate division of the ipsilateral facial nuclei and no labelled neurons were found in the contralateral facial nuclei, in the nuclei of the trigeminal nerve, or any other brain stem nuclei. The mean diameter of HRP-labelled motor neurons was 45 micrometer. Most of them were multipolar in shape containing many dendrites. These result suggest that the intermediate division of ipsilateral facial nuclei play an important role in innervating orbicularis oculi muscle. |
| Key Words:
Facial nucleus;Horseradish Peroxidase;Orbicularis Oculi |
|
PDF Links
Download Citation
