![Sample our Environment & Agriculture journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5934/TOC-Subject-Sample-2021-Environment-Agriculture.jpg"})
Summary
Each of the 19 categories under which we have classified the cervicothoracic musculature is discussed. On the basis of this information and other considerations the cervical, prothoracic, mesothoracic, and metathoracic regions are compared.
Indications are that the cervix plus prothorax represents only a single segmental entity.
The conspicuous differences between the prothoracic and pterothoracic regions are correlated primarily with: (1) reduction in the motor powers of the forelegs; (2) close association of the prothorax with the mobile head; and (3) development of wings on the pterothoracic segments.