Abstract is: The baculum (also penis bone, penile bone, or os penis, os genitale or os priapi) is a bone found in the penis of many placental mammals. It is absent from the human penis, but present in the penises of some primates, such as the gorilla and chimpanzee. The os penis arises from primordial cells within soft tissues of the penis, and its formation is largely under the influence of androgens. The bone is located above the male urethra, and it aids sexual reproduction by maintaining sufficient stiffness during sexual penetration. The homologue to the baculum in female mammals is known as the baubellum or os clitoridis (also os clitoris), a bone in the clitoris.
| P927 | anatomical location | sex organ | Q4620674 |
| P1343 | described by source | All Features Great and Small-the Potential Roles of the Baculum and Penile Spines in Mammals | Q44737341 |
| Sexual selection and genital evolution in mammals: a phylogenetic analysis of baculum length | Q45213567 | ||
| Preparation and preservation of the baculum of mammals. | Q52694511 | ||
| MORPHOLOGICAL VARIABILITY AND EVOLUTION OF THE BACULUM (OS PENIS) IN MUSTELIDAE (CARNIVORA) | Q56445780 | ||
| Is the bat os penis sexually selected? | Q56881311 | ||
| [Comparative studies on the os penis and os glandis in domestic carnivores] | Q71093464 | ||
| P1889 | different from | penile spines | Q29625363 |
| P703 | found in taxon | Placentalia | Q25833 |
| P361 | part of | penis | Q58 |