Dictionary > Baculum

Baculum

Definition
noun, plural: baculums or bacula
A bone located in the glans penis or glans clitoridis of certain mammals, especially members of order Carnivora
Supplement
A baculum is a bone located in the glans penis or glans clitoridis of many mammals (e.g. certain primates, Rodentia species, Lagomorpha species, Eulipotyphla species, and Carnivora species). The baculum may be of variable size and shape; the size and shape are often a characteristic of a species. It is particularly developed in carnivores. It may reach a length of more than 10 cm. Marmosets that weigh around 500 g typically have a baculum of 2 mm in length. A 4.5 feet-long baculum was recovered from an extinct species of walrus.
Most placental mammals have baculum that aids them by providing and keeping sufficient stiffness during copulation. It allows the male to mate with a female for a long time. A homologue occurs in certain female mammals, i.e. baubellum or os clitoridis, which is a bone in the clitoris.
Humans, ungulates, elephants, monotremes, marsupials, lagomorphs, hyenas, sirenians, dolphins, porpoises, and whales are some of the mammals that do not have baculum in penis. Erection of penis is attained through blood pressure in the corpora cavernosa.
Word origin: Latin baculum (“stick, staff, sceptre, cudgel”)
Synonym(s):

  • penile bone
  • penis bone
  • os penis

See also:

  • penis
  • glans penis


    You will also like...

    temperature - abiotic factor
    Abiotic and Biotic Factors

    This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..

    Sigmund Freud and Carl Gustav Jung
    Sigmund Freud and Carl Gustav Jung

    In this tutorial, the works of Carl Gustav Jung and Sigmund Freud are described. Both of them actively pursued the way h..

    Gene Regulation in Eukaryotes
    Gene Regulation in Eukaryotes

    Learn about the general structure of a eukaryotic gene, the transcription factors, and post-transcriptional regulation....

    Still Water Community Plants
    Still Water Community Plants

    This tutorial looks at the adaptations of freshwater plants for them to thrive in still water habitats. Familiarize your..

    Neural Control Mechanisms
    Neural Control Mechanisms

    Neurons generate electric signals that they pass along to the other neurons or target tissues. In this tutorial, you wil..

    3D rendering of an antibody
    Passive and Active Types of Immunity

    Lymphocytes are a type of white blood cell capable of producing a specific immune response to unique antigens. In thi..