PhD in Sexology and Psychosexual Counseling. For More Info WhatsApp- 9604715783/9359863878. Erection of penis: Penile erectile tissue is contained in three corporal bodies; two dorsal corpora cavernosa and a single Corpus spongiosum. All the corpora are surrounded by a thick fibrous sheath, the Tunica Albuginea. All the corpora are contained numerous cavernous spaces separated by trabeculae, composed of thick bundles of smooth muscle. Corpus spongiosum contains fewer muscle cells.