This penis structure contains alot of erectile tissue and little connective tissue so at erection there is both an increase in length and diameter of the of the penis.
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==Fibroelastic Penis==
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Found in:
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*Bull
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*Boar
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*Ram
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*Deer
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These have limited erectile tissue but many fibrous cross bonds and ar encased within a non-expandable connective tissue band the Tunica Albuginea.