Innervation of Triceps surae muscle with the following methods:
1. The reinnervation of tibial nerve fibres was studied 401 days after it was resected, and myelinated nerve fibres constituting this nerve were analyzed with Fukuyama's method (Fan-wise split preparation).
2. Normal myelinated nerve fibres were studied in various methods from one day to 391 days. This report is based on examination of 6 dogs.
The result obtained are summarized as follows:
(1) The number of mylinated nerve fibres in the normal tibial nerve fibres is 11668(adult dog). These consist of 7129 Maximum-sized,2189 large-sized,1698 mediumsized, and 653 small-sized fibres.
(2) The number of reinnervated myelinated fibres 401 days after its resection was 7422. These consist of large-sized (41.7%), maximum-sized (27.9%), medium-sized (20.7%), and small-sized (9.7%), fibres. The number of M. gastrocnemius of laterale is 409. These consist of large-sized (53.8%), maximum-sized (34.2%), mediumsized (10%), and small-sized (2%) fibres. And number of myelinated nerve fibres of M. gastrocnemius of mediale is 372. These consist of large-sized (45.2%), maximum. -sized (24.2%), medium-sized (20.9%), and smallsized (9.7%) fibres. These constitution showed the difference, compared with myelinated nerve fibres of skeletal muscle.
3. The number of myelinated nerve fibres of M. gastrocnemius of laterale after 391 days is 863. These consist of maximumsized (71.6%), large-sized (17.7%), mediumsized (9.9%) and small-sized (0.8%) fibres. And the number of mylinated nerve fibres of M. gastrocnemius of mediale is 1765 These consist of maximum-sized (62.8%), large-sized (22.3%), medium-sized (14.3%), and small-sized (0.6%) fibres. These percentage is different from the reinnervated nerve fibres. And showed the same result which Fukuyama and Ito showed in the nerve fibres of skeletal muscle experiments.
4. The innervated nerve fibres from almost perfect myelinated nerve fibres with myelin. But not all of the form of myelin observed were complete.
5. The number of normal N. tibialis at the 391th day was 13822. The mylinated nerve fibres in peripheral incresed rapidly in two months after birth, and at the 391th day they formed almost completely. At first, small-sized and medium-sized fibres are dominant, but gradually maximum-sized and large-sized fibres become dominant.
6. The number of reinnervated myelinated nerve fibres per one gram of mediale and 51laterale of gastrocnemius muscle is 120 in mediale, and 113 in laterale.
7. The number of reinnervated myelinated fibres per one gram of mediale and laterale of gastrocnemius muscle is 1193 in mediale and 1144 in laterale. This result shows that mediale is little more superior.
8. By the result of these acknowlegement, it is considered that the tendo calcaneus (Tendo achilles) is breaking when this tendo is twisted and pulled by non-co-operating innervating of gastrocnemius muscle of medial head and lateral head.
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