III. Remarks on the cloaca and on the copulatory organs of the amniota | Zendy

Hans Gadow | Zendy

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III. Remarks on the cloaca and on the copulatory organs of the amniota

Author(s) -

Hans Gadow

Publication year - 1886

Publication title -

proceedings of the royal society of london

Language(s) - English

Resource type - Journals

eISSN - 2053-9126

pISSN - 0370-1662

DOI - 10.1098/rspl.1886.0037

Subject(s) - cloaca , anatomy , external anal sphincter , sphincter , anus , pelvis , biology , sex organ , levator ani , pelvic floor , medicine , anal canal , surgery , rectum , genetics

The sphincter muscles of the anus of Crocodilia are differentiations of the postpelvic portion of the system of the m. rectus abdominis rather than of the true eaudal muscles. The copulatory muscles of the Carinatæ are derived from the m. sphincter ani solely, whilst in the Ratitæ they are also differentiations of muscles which are still attached to the pelvis, and are, therefore, skeleto-genital. The mammalian sphincter ani does not take a share in the muscle supply of the copulatory organ, and thus exhibits a difference from Birds and Lizards.

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