In the development of the human heart, the right horn and transverse portion of the sinus venosus ultimately become incorporated with and form a part of the adult right atrium. The line of union between the right atrium and the right auricle is present on the interior of the atrium in the form of a vertical crest, known as the<unk>  of His (Wilhelm His, Jr.).
Crista terminalis
Fibrous trigone
Ganglion impar
Bulbus cordis
Tunica externa 
Pampiniform plexus
Conus medullaris
Deep cervical fascia