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Not to be confused with Bulbourethral gland or Bulb of penis.
Erect bulbus glandis (1) in a Labrador Retriever

The bulbus glandis (also called a knot) is an erectile tissue structure on the penis of canid mammals, including wolves,[1][2][3][4] coyotes[5] and Darwin's fox.[6] During mating the tissues swell up and lock (tie) immediately after penetration of the male's penis inside the female. The locking is completed by circular muscles just inside the female's vagina tightening thus preventing the male from withdrawing. The circular muscles also contract intermittently, which has the effect of stimulating ejaculation of sperm, followed by prostatic fluid, as well as maintaining the swelling of the penis and therefore the tie, for some time. For domestic dogs the tie may last up to half an hour or more, though usually less.[7]

See also[edit]


  1. ^ MobileReference (15 December 2009). The Illustrated Encyclopedia of North American Mammals: A Comprehensive Guide to Mammals of North America. MobileReference. pp. 977–. ISBN 978-1-60501-279-7. Retrieved 10 December 2012. 
  2. ^ Kim Long (1996). Wolves: A Wildlife Handbook. Big Earth Pub. ISBN 978-1-55566-158-8. Retrieved 10 December 2012. 
  3. ^ L. David Mech (16 May 2012). Wolf. Random House Digital, Inc. pp. 172–. ISBN 978-0-307-81913-0. Retrieved 10 December 2012. 
  4. ^ Marshall Cavendish Corporation (1 September 2010). Mammal Anatomy: An Illustrated Guide. Marshall Cavendish. pp. 252–. ISBN 978-0-7614-7882-9. Retrieved 10 December 2012. 
  5. ^ Debra A. Carlson (2008). Reproductive Biology of the Coyote (Canis Latrans): Integration of Behavior and Physiology. ProQuest. pp. 67–. ISBN 978-0-549-50315-6. Retrieved 9 February 2013. 
  6. ^ H. M. Menino (2008). Darwin's Fox and My Coyote. University of Virginia Press. pp. 101–. ISBN 978-0-8139-2675-9. Retrieved 9 February 2013. 
  7. ^ Susan Long (2006). Veterinary Genetics and Reproductive Physiology. Churchill Livingstone Elsevier. ISBN 978-0-7506-8877-2. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Bulbus_glandis — Please support Wikipedia.
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7 news items

Fri, 18 Jul 2014 10:03:15 -0700

The term knotting is a reference to the reproductive organs of canid animals. If you're not familiar with these reproductive organs, it's really pretty simple: The wolf penis has what's called a Bulbus Glandis, commonly known as a knot, that swells ...

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Tue, 25 Mar 2014 11:47:24 -0700

Blood rushes into the base of the penis, called the bulbus glandis, causing the organ to swell in size. At the same time, the female's vagina contracts against the penis, creating what's known as a “copulatory tie,” “coital tie,” or best of all, “dog ...
Thu, 27 Mar 2014 09:18:45 -0700

Once the penis is safely inside … blood rushes into the base of the penis, called the bulbus glandis, causing the organ to swell in size. At the same time, the female's vagina contracts against the penis, creating what's known as a “copulatory tie ...
Thu, 22 Nov 2012 03:48:45 -0800

While mating, they come across the act of 'tying'. In tying, the bulbus glandis (erectile tissue structure of the male dog) swells while breeding thus tying the two dogs together. Tying usually lasts for 20-25 minutes so the dog can turn around to open ...

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Wed, 16 Apr 2014 21:03:45 -0700

El veterinario Sergio Cuenca explica que al momento de aparearse, cuando el pene del macho penetra la vagina, un tejido especial en la base del miembro viril, el bulbus glandis, se llena de sangre y se infla, con lo que queda atrapado. Esto sirve para ...


Tue, 22 Jul 2014 04:00:51 -0700

Die haben an ihrem Penis nämlich einen Bulbus Glandis, eine Art Knoten, mit dem sie sich beim Geschlechtsverkehr im Weibchen einhaken können, bis die Besamungsnummer durch ist. Beim "Knotting" stellen sich die schreibfreudigen Fans dann vor, ihre ...
Wed, 29 Sep 2010 02:24:00 -0700

Les deux protubérances que vous pouvez observer à la base du pénis sur le dessin ne sont pas les testicules mais une structure érectile appelée le bulbus glandis. Il s'agit d'un élargissement du corps caverneux qui augmente de volume à l'intérieur des ...

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