An apparently powerful support from the side of embryology came in Dohrn and Rabl's discoveries that in Pristiurus all the interpterygial myotomes produce muscle-buds.
This, however, was explained away by the Gegenbaur school as being merely evidence of the backward migration of the hind limb--successive myotomes being taken up and left behind again as the limb moved farther back.
The myotomes or muscular bands on the sides are usually coincident with the number of vertebrae.
The relations of the arcualia to the segmentation of the body, as shown by myotomes and spinal nerves, is somewhat obscure.
These muscles, like the other voluntary muscles of the body, are derived from the primitivemyotomes and are therefore segmental in origin.
This is expressed roughly on the external surface of Amphioxus by the direction of the connective tissue septa between the myotomes (cf.
This sheet is split into segments or myotomes by transverse connective tissue septa or myo-commata; each myotome corresponding to one spinal segment.
The one set is concerned with the movements of internal organs, and is called visceral, the other is derived from the longitudinal sheet of musculature which forms the myotomes of the fish, and has been called parietal or somatic.
In the case of Salamandra there are formed in the region of the posterior (10-16) myotomes secondary, tertiary, etc.
The number of primary segmental tubes in the separate myotomes of Salamandra is as follows: In the 6th myotome (i.
For this reason, when the vertebrae became formed, their centres were opposite not the middle of the myotomes but the intermuscular septa.
The myotomes are now very numerous (about 57, including those of the head, in a three days' larva).
In the first place it is clear from Amphioxus that the ancestors of the Chordata were segmented, and that their mesoblast was divided into myotomes which extended even into the region in front of the mouth.
Apparently correlated with this peculiar locomotion is the anatomical fact of the alteration of the myotomes on the two sides.
These myotomes enable it to swim rapidly with characteristic serpentine undulations of the body, the movements being effected by the alternate contraction and relaxation of the longitudinal muscles on both sides.
The generic characters are based upon definite modifications of form which affect the entire facies of the animals, while the specific diagnoses depend upon minor characters, such as the number of myotomes or muscle-segments.
From the phylogenetic point of view the myotomes are much older than the sclerotomes.
The myotomes are also developed from the thick wall of the coelom-pouches (Figure 1.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "myotomes" in a variety of sentences. We hope that you will now be able to make sentences using this word.
