Articles tagged with Animal Anatomy
Scientists at Cornell University have identified changes in the brain region associated with aggression in tame foxes, which may explain their friendly nature. The study found that domesticated foxes have fewer estrogen receptor-expressing neurons in this region, which could contribute to their reduced aggression
A new study suggests using iris patterns to identify individual Amazonian treefrogs, providing a humane alternative to toe-clipping. The method was tested on 392 captures and showed a high degree of accuracy, with 56-80% of frogs recaptured and reliably re-identified within a single season.
Researchers found that ancient sled dogs had 6% shorter leg bones than other similar species, which may have given them an advantage in pulling loads. This skeletal pattern could help identify possible sled dogs even with incomplete archaeological remains.
Researchers studied the neck vertebrae of northern gannets and boobies, finding reinforced vertebrae with additional contact surfaces that stabilize the cervical column. This adaptation allows the birds to survive high-speed impacts and enables them to plunge-dive at 70 miles per hour.
A newly discovered fossil, Megacauda sungei, uncovered key anatomical structures required for mammalian suckling and swallowing behaviors, evolving nearly 165 million years ago. The research challenges a longstanding assumption about the evolution of these structures, suggesting a more complex and nuanced origin story.
Researchers at Case Western Reserve University have discovered hundreds of previously unknown hair cells on the surface of squid bodies, similar to those found in the human ear. This finding may provide insights into how humans use and lose their hearing, particularly in cases of deafness or hearing loss.
Researchers analyzed shark vertebrae to discover a finely engineered biomechanical system supporting strength, flexibility, and swimming efficiency. Different species evolved unique internal structures reflecting their varied swimming strategies.
A previously unknown species of African monkey, Colobus congoensis, has been identified in the Democratic Republic of Congo. The species, known locally as Likweli, features a distinctive orange face patch and is one of the rarest discoveries in modern primatology.
Researchers found that elephants' bone-conduction hearing is significantly improved due to their larger middle ear structures and ability to voluntarily close their ear canals. This allows them to transmit lower frequency sounds to the cochlea, enhancing low-frequency hearing by up to 30 times
New study redefines the existence of necks in fish and amphibians, identifying functionally distinct anatomical regions. The project aims to build new definitions that apply more widely across all major vertebrate groups.
A new study has mapped cellular signaling networks between bone and skeletal muscle, identifying key ligand-receptor pairs that facilitate communication between cells. The research revealed a complex network of molecular pathways that coordinate tissue maintenance and remodeling, with implications for understanding musculoskeletal diso...
A new study from Stockholm University found that young guppies raised with visual contact to live fish developed larger brains and relatively larger olfactory bulbs compared to those with only screen-based exposure. This suggests that interactive social experiences during development may be important for normal brain growth.
Researchers uncovered previously unknown features in the limb musculature of the macaroni penguin that help explain its efficient movement on land and underwater. The study found modified key wing muscles and a unique configuration of shoulder muscles giving penguins an 'underwater flying' wing stroke.
A new study identifies a previously unknown brainstem pathway controlling hand and arm movements, revealing a multi-stage pathway integrating signals from the cortex, brainstem, and spinal networks. This finding may lead to new therapies for stroke rehabilitation, providing additional targets for neuromodulation treatments.
Modern bears' tooth development does not follow the Inhibitory Cascade Model, with the second molar being largest. Researchers identified two breaks in bear history, at 3.6 million years ago and 1.25-0.7 million years ago, associated with dietary adaptations.
A study published in Nature Communications reveals that adult marine bristleworms have a ring of neural stem cells that actively divide when growing their eyes, driven by environmental light. The research also shows that these stem cells are regulated by a c-opsin molecule, similar to those found in vertebrate retinas.
UCLA researchers have identified two key proteins, HuR and CEACAM1, that act as protective switches to prevent damage in damaged livers. By boosting this protection, organs deemed unsuitable for transplantation could be made suitable for use.
Researchers found that human selection and environmental changes led to a synchronous evolution of domestic and wild animal body sizes over the past 7,000 years. However, in recent centuries, human impact has intensified, causing wild species to shrink while domestic animals have grown larger.
Research reveals that day-flying moths have larger hearing organs than their night-flying counterparts despite facing less threat from echolocating bats. This counterintuitive finding suggests a possible new function for tympanal organs in detecting lower-frequency sounds produced by birds or reptiles.
Dwarf Channel Island foxes (Urocyon littoralis) have larger brains than their mainland gray fox counterparts, contradicting the notion of island-specific evolutionary pressures leading to reduced brain size. This finding suggests little evidence of domestication in these isolated California islands.
Cal Poly biological sciences Professor Emily Taylor is co-organizing the worldwide awareness week for snakes, highlighting over 3,500 globally significant species. The event promotes peaceful coexistence between humans and snakes, educating people about their importance in food webs and disease control.
Researchers discovered a unique nanostructure in blue shark skin that produces their iconic blue coloration, which also suggests a potential capacity for color change. Tiny changes in guanine crystal spacing can alter the shark's body color to suit its environment.
A team led by L. Mahadevan found that young anacondas can execute a quick, one-off skating movement called the 'S-start' due to their physical attributes. This movement is similar to sidewinding and could inspire new robotic systems.
Researchers developed an animal model of forelimb embodiment in mice to study the neural basis of sensory-based forelimb embodiment. The findings suggest that mice can develop a sense of embodiment of an artificial limb, similar to humans who participate in the rubber-hand illusion experiment.
Researchers created first complete genetic activity map of a branching worm, revealing how it controls reproduction across its multiple body branches. The study highlights the unique genetic toolkit and challenges understanding of animal bodies' organization.
A new species of ancient tree frog, Litoria tylerantiqua, has been discovered in Australia, challenging previous estimates of when Australian and South American tree frogs separated. The fossil record indicates that the separation occurred approximately 22 million years ago, rather than 33 million years ago as previously thought.
Researchers at UCL and the Francis Crick Institute have identified the origin of cardiac cells using 3D images of a heart forming in real-time. They found that cardiac cells emerge rapidly during gastrulation and follow distinct paths to form the heart's pumping chambers and atria.
Researchers discovered that reef fish like Moorish Idol and surgeonfish can move their jaws from side to side, allowing them to feed rapidly on algae. This unique ability has interesting ecological and evolutionary consequences.
A nearly complete 69-million-year-old skull from the Cretaceous Period has provided new insights into the evolutionary history of modern birds. The fossil, Vegavis iaai, exhibits traits consistent with those of waterfowl and is now considered one of the earliest known members of this group.
Cricket frogs use a combination of underwater push and leg movement to propel themselves out of the water, resulting in a 'belly flop' motion. This discovery could lead to advancements in bio-inspired robotics and water testing systems.
Brachycephalus dacnis is the seventh species of flea toad identified in the genus Brachycephalus. The study published by a group at the State University of Campinas provides detailed information about its anatomy, skeleton, and internal organs.
Researchers have created a detailed 3D atlas of the African clawed frog's development, revealing key changes during metamorphosis. The atlas uses X-ray microtomography to show the transformation from tadpole to mature adult frog.
Researchers compared human hearts with those of great apes, discovering a more compact muscle structure in humans, related to greater cardiac function. This finding supports the hypothesis that human heart evolved to meet higher demands of human physiology, such as larger brain size and physical activity.
Researchers discovered lemurs possess an additional pair of vocal folds, which they believe is responsible for enriching their vocal repertoire and allowing them to exaggerate their size. This adaptation may have provided a selective advantage in competition for territory or mates.
Researchers found that baby teeth alongside permanent saber teeth provided stability and protection during the growth process. The 'double-fang' stage lasted up to 30 months, allowing young cats to experiment and learn how to hunt without damaging their sabers.
Researchers compared zebrafish and medaka fish species to understand the physiological differences between regenerating and non-regenerating animals. Zebrafish exhibit an interferon response in their heart tissue after injury, which promotes the growth of new blood vessels and leads to muscle regeneration.
Researchers have created 3D images of over half of the world's animal groups using CT scans, making them accessible to scientists, researchers, students, teachers, and artists. The open-source repository MorphoSource allows users to share findings and improve access to material critical for scientific discovery.
The Almodóvar lab is studying the link between HIV and pulmonary hypertension, a condition that increases pressure in lung arteries. By examining the interactions between different cell types and using a humanized mouse model, researchers hope to propose novel therapies to prevent lung diseases in people with HIV.
Detailed CT scans reveal the worm-lizard's skull anatomy, including sutured bones and a singular central tooth. Researchers also discovered sexual dimorphism in one species, confirming their findings through powerful jaw muscles.
A study found that migratory bats are sensitive to the angle of magnetic inclination and use it for navigation. The soprano pipistrelle bat species calibrated its internal compass at sunset, taking into account both the horizontal component and inclination of the Earth's magnetic field.
Researchers used genetic and molecular tools to create a 3D atlas of gene expression in starfish, revealing that the "head" is distributed across each arm and center. The study provides insight into the evolution of echinoderms, including sea stars, which have a unique body plan compared to humans.
Researchers studied over 100 noctilionoid bat species, finding that different dietary types drove modifications in tooth number, size, shape, and position. For instance, fruit-eating bats have shorter jaws with reduced middle premolars, while nectar-feeders have longer jaws with room for more teeth.
A team of researchers compared the development of blood vessels in various animals, including mice, quails, and fish, to understand the origins of the human heart. They found that the structure of the human coronary arteries likely evolved from a common amniote ancestor, adapting to life on land.
Researchers at West Virginia University are tracing the cause of diabetic heart disease using diabetic animal models to examine mitochondrial function. They hope to understand how faulty protein import affects the mitochondria and explore potential treatments to improve energy production and reduce cardiovascular risk.
Researchers found that declawing larger cat species results in significantly lighter muscle density and mass, particularly in the deep digital flexors, leading to reduced strength and functionality. This study highlights the cruelty of declawing practices on exotic animals.
New research uses MRI and CT scans to study the anatomy of primate clitoris, revealing stark differences in morphology across species. The findings suggest that female genitalia have been chronically understudied, with significant diversity in clitoral structure and function.
A recent study on canine brain networks has provided insights into the evolution of human brain function, revealing that the cingulate cortex played a central role in mammalian brain development. The research used fMRI to analyze brain activity in dogs and identified functional networks that differ from those in humans.
Researchers have developed a new method to study ant brain chemistry, revealing differences in neuropeptide distribution between two species. The approach integrates 3D chemical data with high-definition anatomical models, providing unbiased visualization of neurochemistry.
Researchers use 3D imaging technology to study Tully monsters and reject vertebrate hypothesis, but uncertainty remains about its exact classification as an invertebrate chordate or protostome. The study sheds light on the challenges of piecing together Earth's evolutionary history and highlights the importance of Mazon Creek fossils.
The Center for C. elegans Anatomy is receiving $2.6 million in funding from the NIH to expand WormAtlas, a resource for researchers studying C. elegans and other nematodes. The expansion aims to incorporate new nematode species into the atlas, enabling comparisons between C. elegans and less-studied species.
Male giraffes test female sexual receptivity by nudging them to urinate, then inhaling their scent with flehmen. This behavior is crucial for mating and understanding giraffe anatomy supports it.
Scientists at Nagoya University developed an index to estimate a bird's wing use based on coracoid bone strength and body mass. This new tool sheds light on how ancient birds evolved to fly, including the flapping abilities of extinct species.
A 319-million-year-old fossilized fish has provided the oldest example of a well-preserved vertebrate brain, shedding new light on the neural anatomy and early evolution of ray-finned fishes. The discovery reveals that brain evolution in these animals unfolded more complexly than previously thought.
A new fossil site in Morocco has revealed giant arthropods that were up to 2m long and played a unique role in ancient ecosystems. The discovery opens new avenues for paleontological research and provides insights into the evolution of early animal life on Earth.
A new diapsid reptile species has been discovered in Oklahoma with evidence of dental pathology, providing insights into its biology and evolution. The fossil, dated to the early Permian period, was analyzed using neutron tomography and revealed abnormalities in its teeth.
Researchers discovered a unique anatomical design in octopus nerve cords that connects arms symmetrically, providing new insights into alternative nervous system structures. This discovery may aid in the development of new engineered technologies, such as robots and autonomous underwater devices.
A new study on a 525-million-year-old fossil has shed light on the origin and composition of arthropod heads, resolving a century-old debate. The discovery of a delicately preserved nervous system in the fossil of Cardiodictyon catenulum, a tiny sea creature, suggests that the brain and trunk nervous system evolved separately.
A new study reveals how cane toads (Rhinella marina) consume prey by using a complex pulley system of cartilage and muscle. The mechanism involves the hyoid plate, which is attached to muscles and loops like a marionette, pulling food backward into the throat.
Researchers found a longer PR interval and prolonged QT duration in genetically modified pig hearts after transplantation into humans, indicating signs of electrical disease. The study provides a foundation for future research to better understand xenotransplantation's effects on the heart's electrical system.
Researchers suggest special blood vessels called 'retia mirabilia' reduce brain pressure pulses, preventing damage. Computer modeling supports theory, which could be applied to other animals and humans.