Studies on the Myelinated Fibers in the Recurrent Laryngeal Nerves of Domestic Animals VI. Characteristics of Myelinated Fibers in the Reccurrent Laryngeal Nerves of Domestic Animals

Yoon, Suk Bong

Korean Journal of Veterinary Research 1966;6(1):82-91.

Suk Bong Yoon

College of Agriculture, Seoul National University

가축(家畜)의 반회후두신경(反回喉頭神經) 유수섬유(有髓纖維)에 관(關)한 연구(硏究) 제(第)VI보(報) 가축(家畜)의 반회후두신경(反回喉頭神經) 유수섬유(有髓纖維)의 특징(特徵)

윤석봉

서울대학교 농과대학

Abstract

Studies On the myelinated fibers of the recurrent laryneal nerves were made in five, species of domestic animals namely dog, pig, goat, horse and Korean ox. Throughout the studies, the following characteristics of the myelinated fibers were obtained. 1. The number, size and cross sectional area of the myelinated fibers seemed to be proportionally related to the animal body weights. 2. The highest peak of diameter size frequency distribution of the myelinated fibers, observed at the right cranial level, in dog, goat and horse were 4-6 micron group, while in the case of Korean ox, 10-12 micron group was the highest. 3. The highest peak of diameter size frequency distribution of the myelinated fibers, observed at the right caudal level of Korean ox was 6-8 micron group, and 4-6 micron group was the highest in the other animals. 4. The highest peak of diameter size frequency distribution of the myelinated fibers obsered at the left cranial level was same to that of right cranial level. 5. The highest peak of diameter size frequency distribution of the myelinated fibers, observed at the left caudal levels in dog, goat, horse and Korean ox was 4-6 micron group, while in case of pig, $14-16{mu}$ group was the highest. 6. The largest cross sectional areas were found in the group of 10-16 micron in all species of animals. 7. The fiber diameter size frequency distribution of recurrent laryngeal nerves of dog, goat, pig and horse were bimodal and Korean ox seemed to be a unimodal.