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Lordosis Behavior
Lordosis Behavior
::2012/06/17::
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Diferences in Sexual Behavior Pattern (rats)
Diferences in Sexual Behavior Pattern (rats)
::2008/06/03::
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Horse reprodcution
Horse reprodcution
::2014/02/25::
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Corrective Exercise For Lordosis
Corrective Exercise For Lordosis
::2013/12/03::
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Stallion with Mare
Stallion with Mare
::2014/02/25::
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Semental Mating a Mare
Semental Mating a Mare
::2014/02/25::
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Horses Breeding hard
Horses Breeding hard
::2014/02/25::
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Horses Breeding in park
Horses Breeding in park
::2014/02/25::
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Caballo horse breeding
Caballo horse breeding
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Stallion
Stallion
::2014/02/25::
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Stallion Big foot horse
Stallion Big foot horse
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MATING Semental
MATING Semental
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Horses Follando
Horses Follando
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Caballo caliente Breeding
Caballo caliente Breeding
::2014/02/25::
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Animals mating reproducing
Animals mating reproducing
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semental Pisando   Breeding Stallion
semental Pisando Breeding Stallion
::2014/02/25::
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Breeding Caballo caliente
Breeding Caballo caliente
::2014/02/25::
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Horse Reproducing in farm
Horse Reproducing in farm
::2014/02/25::
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Caballo reproduciendo
Caballo reproduciendo
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Black Stallion Mating Horse
Black Stallion Mating Horse
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Slutty Teacher
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Horse Having a good time
Horse Having a good time
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horse mating animals mating stallion mating
horse mating animals mating stallion mating
::2014/02/27::
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Burro caliente mating donkey
Burro caliente mating donkey
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horse mating animals mating stallion mating
horse mating animals mating stallion mating
::2014/02/27::
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Mating animals
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Reproducing Horse
Reproducing Horse
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horse mating animals mating stallion mating
horse mating animals mating stallion mating
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Big Horse reproducing
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horse mating animals mating stallion mating
horse mating animals mating stallion mating
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animals mating animals breeding
animals mating animals breeding
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Two Horses
Two Horses
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horse mating animals mating stallion mating
horse mating animals mating stallion mating
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mating big mating animals  grandi animali di accoppiamento
mating big mating animals grandi animali di accoppiamento
::2014/02/27::
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horse mating animals mating stallion mating
horse mating animals mating stallion mating
::2014/02/27::
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Reproducing Lizards
Reproducing Lizards
::2014/02/25::
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Caballo Mating horse
Caballo Mating horse
::2014/02/25::
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Burro donkey mating
Burro donkey mating
::2014/02/25::
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Tremendo Burro mating
Tremendo Burro mating
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Semental Horses Mating
Semental Horses Mating
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horse mating animals mating stallion mating
horse mating animals mating stallion mating
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Semental  big Stallion at work
Semental big Stallion at work
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horse mating animals mating stallion mating
horse mating animals mating stallion mating
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Mating Donkey Caliente
Mating Donkey Caliente
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Happy horse mating
Happy horse mating
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Mare and Stallion mating
Mare and Stallion mating
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Stallion foreplay
Stallion foreplay
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Living With Lumbar Lordosis or Ghetto Booty as a White Male
Living With Lumbar Lordosis or Ghetto Booty as a White Male
::2014/06/27::
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Breeding horse  semental
Breeding horse semental
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nice horses breeding
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From Wikipedia, the free encyclopedia
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Lordosis behavior by a female cat during copulation

Lordosis behavior—also known as mammalian lordosis (Greek lordōsis, from lordos "bent backward"[1]) or presenting—is a body posture adopted by mammals including humans, mice, cats, and others, usually associated with females and their receptivity to copulation. The primary characteristics are a lowering of the forelimbs whilst keeping the rear limbs extended and hips raised, ventral arching of the spine and a raising, or sideward, displacement of the tail. During lordosis, the spine curves dorsoventrally so that the apex points towards the abdomen. The term "lordosis" is sometimes used to describe, in humans, abnormal forward curvature of the spine in the lumbar region.[1]

Lordosis occurs both during pre-copulatory behavior and during copulation itself. Lordosis aids in copulation as it elevates the hips, thereby facilitating penetration by the penis. It is commonly seen in female mammals during estrus (being "in heat"). The posture moves the pelvic tilt in an anterior direction, with the posterior pelvis rising up, the bottom angling backward and the front angling downward.

During estrus, the estrogen hormone, estradiol, regulates sexual receptivity by the neurons in the ventromedial nucleus[2] of the hypothalamus, the periaqueductal gray, and other areas of the brain. Sexual stimuli trigger activity in a number of brain areas, including the ventromedial hypothalamus, which sends impulses down axons synapsing with neurons in the periaqueductal gray. These convey an impulse to neurons in the medullary reticular formation which project down the reticulospinal tract and synapse with afferent nerve fibers in the spinal cord (L1-L6). These cause muscles along the spine to contract, thereby producing the lordosis posture. Because these afferent fibers are also part of a reflex arc, lordosis can be triggered reflexively.[3]

Lordosis can be elicited by manual cutaneous stimulation of the flanks followed by the rump-tail base-perineum region,[3] or induced by injections of estradiol benzoate and progesterone.[4]

In humans[edit]

The anthropologist Helen Fisher speculates that when a human female wears high-heeled footwear the buttocks thrust out and the back arches into a pose that simulates lordosis behavior, which is why high heels are considered "sexy".[5]

See also[edit]

References[edit]

  1. ^ a b "Lordosis". Wordnik. Retrieved December 15, 2013. 
  2. ^ Kow LM, Pfaff DW (May 1998). "Mapping of neural and signal transduction pathways for lordosis in the search for estrogen actions on the central nervous system". Behav Brain Res. 92 (2): 169–180. doi:10.1016/S0166-4328(97)00189-7. PMID 9638959. 
  3. ^ a b Pfaff, D.W. and Sakuma, Y. (1979). "Facilitation of the lordosis reflex of female rats from the ventromedial nucleus of the hypothalamus". Journal of Physiology 288: 189–202. 
  4. ^ Olster, D.H. and Blaustein, J.D. (1989). "Development of steroid-induced lordosis in female guinea pigs: effects of different estradiol and progesterone treatments, clonidine, and early weaning.". Hormones and Behaviour 23 (1): 118–129. Retrieved December 16, 2013. 
  5. ^ Laura T. Coffey (Sep 23, 2009). "Do high heels empower or oppress women?". TODAY msnbc.com. 
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