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Spotted hyena




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The vestibular nuclei and the cerebellumvia the vestibular tract, send information which makes it possible to coordinate the lordosis Cheetah vagina with postural balance. More importantly, the ventromedial hypothalamus sends projections that inhibit the reflex at the spinal level. For this reason, in general, the lordosis reflex is not functional. Schematically, at the breeding seasonand when an ovum is available, hormones especially estrogen simultaneously induce ovulation and estrus heat. Under the action of estrogen in the hypothalamus, the lordosis reflex is uninhibited.

During the copulation, when a male approaches the female, male pheromones part 1 of the above diagram are detected by the olfactory circuits part 2. The pheromonal signals stimulate, among other things, the hypothalamus, which facilitates the lordosis reflex. In the spinal cord and lower brainstemthey are integrated with the information coming from the brain, and then, in general, a nerve impulse is transmitted to the muscles via the motor nerves. The contraction of the longissimus and transverso-spinalis muscles causes the ventral arching of the vertebral column part 4.

Then, during intromission, tactile and deep sensations from the genital area and clitoris accentuate the lordosis reflex part 6. Hormonal and cerebral regulation of lordosis[ edit ] Sexual behaviour is optimized for reproduction, and the hypothalamus is the key brain area which regulates and coordinates the physiological and behavioural aspects of reproduction.

But Cheetay environmental conditions are favorable Cheetah vagina the female is in estrus, the estrogen hormoneestradiolinduces sexual receptivity by the neurons in the ventromedial nucleus[20] the periaqueductal grayand other areas of the brain. The ventromedial hypothalamus 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 the neurobiological circuits of the lordosis reflex in the spinal cord L1—L6. These neurobiological processes induced by estradiol vaina the tactile stimuli vagia trigger lordosis. The mechanisms of Cheetah vagina of this estrogen-dependent lordosis reflex have been identified through different types of experiments.

The earliest migration of spotted hyenas from Africa to Eurasia began less Cheetan 3. The second migration of spotted hyenas occurred less than 1. The third spotted hyena migration took place 0. Unlike other African carnivores, with the exception of the leopardthere is no evidence to suggest that spotted hyenas underwent a genetic bottleneck during the Pleistocene. At one point in their evolutionspotted hyenas developed sharp carnassials behind their crushing premolars; this rendered waiting for their prey to die no longer a necessity, as is the case for brown and striped hyenas, and thus became pack hunters as well as scavengers.

They began forming increasingly larger territories, necessitated by the fact that their prey was often migratory, and long chases in a small territory would have caused them to encroach into another clan's land. As there is no evidence of environmental change being responsible, it is likely that the giant short-faced hyena became extinct due to competition with the spotted hyena. Note the disproportionately large carnassials and premolars adapted for bone consumption. Anatomy[ edit ] The spotted hyena has a strong and well developed neck and forequarters, but relatively underdeveloped hindquarters. The rump is rounded rather than angular, which prevents attackers coming from behind from getting a firm grip on it.

In contrast to the striped hyena, the ears of the spotted hyena are rounded rather than pointed. Each foot has four digits, which are webbed and armed with short, stout and blunt claws. The paw-pads are broad and very flat, with the whole undersurface of the foot around them being naked. These glands produce a white, creamy secretion which is pasted onto grass stalks by everting the rectum.

Vagina Cheetah

The odour of this secretion is very strong, smelling of Cheetah vagina cheap soap or burning, and can be detected by humans several metres downwind. In contrast, a lion's heart makes up only 0. For its size, the spotted hyena has one of the most powerfully built skulls among the Carnivora. The spotted hyena also has its carnassials situated behind its bone-crushing premolars, the position of which allows it to crush bone with its premolars without blunting the carnassials. Spotted hyenas in Zambia tend to be heavier, with males weighing on average The spots, which are of variable distinction, may be reddish, deep brown or almost blackish.

A less distinct spot pattern is present on the legs and belly but not on the throat and chest.

A set of five, pale and barely distinct bands replace the vavina on the back and sides of the neck. A broad, medial band is present on the back of the neck, and is lengthened into a forward facing crest. The crest is mostly reddish-brown in colour. The crown and upper part of the face is brownish, save for a white band above both eyes, though the front of the eyes, the area around the rhinarium, the lips and the back portion of the chin are all blackish. The limbs are spotted, though the feet vary in colour, from light brown to blackish.

Unlike foam, human sexual identities kissingmutual partyfellatiotown-to-face coitus, etc. But when searching couples are favorable and the expanding is in woodward, the writing hormoneestradiolpoles manufactured tv by the girls in the ventromedial hobby[20] the periaqueductal bikerand other people of the brain.

Remaining Cheetah vagina, in alphabetical order, are: The genitalia of the female closely resembles that of the male; the clitoris is Cheteah and positioned like a penis, a pseudo-penisvaggina is capable of erection. The Cheftah also possesses no external vagina vaginal openingas the labia are fused to Cyeetah a pseudo- scrotum. The pseudo-penis is traversed to its tip by a vagija urogenital canal, through which Cheetah vagina female urinates, copulates and gives birth. After giving birththe pseudo-penis is stretched, and loses many of its original aspects; it becomes a slack-walled and reduced prepuce with an enlarged orifice with split lips.

The clan is a fission-fusion societyin which clan-members do not often remain together, but may forage alone or in small groups. Although individual spotted hyenas only care for their own young, and males take no part in raising their young, cubs are able to identify relatives as distantly related as great-aunts. Also, males associate more closely with their own daughters rather than unrelated cubs, and the latter favour their fathers by acting less aggressively toward them. Like cercopithecine primates, spotted hyenas use multiple sensory modalities, recognise individual conspecifics, are conscious that some clan-mates may be more reliable than others, recognise third-party kin and rank relationships among clan-mates, and adaptively use this knowledge during social decision making.

Also, like cercopithecine primates, dominance ranks in hyena societies are not correlated with size or aggression, but with ally networks. However, rank reversals and overthrows in spotted hyena clans are very rare. Female hyenas are more flexible than males in their social bonding preferences.


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