The ventral serrate muscle of the thorax is a large serrated, fan-shaped muscle extending from the first seven or eight ribs to the facies serrata of the scapula.
Origin: Facies serrata of the scapula.
Insertion: the first seven or eight ribs.
Action: Support of the trunk, to carry the trunk forward and backward; inspiration; to carry the shoulder forward and backward with respect to the limb.
Nerve: ventral branches of thoracic nerves.
Note from author: In some species (mainly in carnivores), the ventral serrate muscle of the neck (serratus ventralis cervicis) and the ventral serrate muscle of the thorax (serratus ventralis thoracis) are continuous together, and described together. We think it's not a convenient way because: