In the right atrium, behind the crest the internal surface of the atrium is smooth, while in front of it the<unk> r fibers of the wall are raised into parallel ridges resembling the teeth of a comb, and hence named the<unk>  <unk>  muscles).
In the left atrium, the<unk> , fewer and smaller than in the right auricula, are confined to the inner surface of the auricula. This is due to the embryological origin of the auricles, which are the true atria. Some sources cite that the<unk>  are useful in increasing the power of contraction without increasing heart mass substantially.
Musculi pectinati
Gusperimus
Squama temporalis
Myoporum laetum
Ganglion impar
Tunica externa 
Incisor
Malleus