Abstract:
The transverse process of thorax vertebra had a different conformation in the
muskrat’s case. This process was completely formed in the first three and the last two thoracic
vertebra (the lamina separated from the body is knitted with the one separated from the arch).
Starting with the fourth vertebra until the eleventh one, the transverse process was incomplete.
Between the two laminas, a deep incision was created. The lamina separated from the body
was changed in an articulatory process, made up of two surfaces: a lateral (ventral) one, of
articulation with the tubercle of the rib, and a medial (dorsal) one. The transverse incision was
used for sliding like on a trochlea of the costal-transverse intraarticular ligament, which was
specific to the muskrat, for the insertion in the back of the incision.
