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Questions tagged [anatomy]

The study of the structure of organisms and their parts.

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Patterns of craniofacial topology

There are animals which are not directly related but have similar craniofacial topology. For example: koala, donkey, mouse, turtle, parrot all have features seemingly belonging to same topology, ...
Mikhail V's user avatar
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What is the part between the eyebrow tail and above the eyelid called?

I need to know that anatomical name of the portion of the face between the eyebrow tail and the eyelid, as highlighted in red in the image below, as I need to refer to that particular area in writing ...
hecate's user avatar
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Why are the ducts of pancreas lined with compound epithelium?

Most other places with compound epithelium are in contact with the outside world, and that of course makes sense. So why would a duct snugly placed inside our body need stratified epithelium? Is it to ...
Gaurav Sai Maddipati's user avatar
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I learnt that anterior axillary folds are formed by pec maj but I can palpate and feel a hard tendon like structure

What is that hard tube like structure that I can feel in anterior axillary folds? I think it can’t be pec major because it’s tendon is bilaminar not like a tube? Is it suspension ligament formed by ...
Dr Tenma's user avatar
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Can the instantaneous center of rotation of a vertebrae be mathematically determined for flexion of lumbar?

I am starting to learn spinal anatomy and I want to determine the Instantaneous axes of rotation (IAR) of individual vertebrae. I have referred many research papers but haven't come across any useful ...
Prakhar's user avatar
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What are all the possible abnormalities in our body that will result in ataxia?

So I know that ataxia is caused by loss of proprioception.I only know that dorsal column medial leminiscal pathway carries proprioceptive fibre to the cerebellum.So in theory damage to either this ...
Physkiz's user avatar
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1 answer
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Is urethra a part of male accessory duct system?

In my textbook it is written that male accessory duct system constitutes the rete testis , vasa efferentia , epididymis and the vas deferens . Can urethra be also included here ?
Kumar Priyanshu's user avatar
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Sexual dimorphism of the Amphimachairodus genus of saber-toothed cats

Amphimachairodus is an extinct genus of particularly large saber-toothed cats. Per Alan Turner and Mauricio Antón's The Big Cats and Their Fossil Relatives: An Illustrated Guide to Their Evolution and ...
KEY_ABRADE's user avatar
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28 views

How did birds reduce their tail and fuse the last caudual vertebrae into a pygostyle?

I was just looking at the phylogeny of Avialae and saw that birds go from having long tails made up of many caudal vertebrae (ex: Archaeopteryx, Jixiangornis, Jeholornis) to ones with very few ...
RenaMoon's user avatar
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What determines the color of the air sac of a Portuguese man o' war?

I know that the Portuguese man o' war is a colonial organism composed of many "zooids", one of which is the pneumatophore, which essentially serves as a flotation device for the whole colony....
Robert Columbia's user avatar
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Are the spikes or prongs in the frill of Ceratopsids considered horns?

Many Ceratopsids, mostly of the subfamily Centrosaurinae, have long spikes or prongs sticking out from the edge of the frill, most famously Styracosaurus, but also Diabloceratops and Rubeosaurus and ...
Triceratops's user avatar
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Why are lymph nodes located where they are? [closed]

According to the National Cancer Institute, a subdivision of the National Institutes of Health, clusters of lymph nodes are found in the neck, underarm, chest, abdomen, and groin. Why are lymph nodes ...
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What is the earliest known animal that could run? [closed]

By "running" I mean a land gait that at one point has all propulsion limbs off the ground. Jumping, like a flea or a frog, is not running. The earliest land vertebrates could not run, I ...
Zemyla's user avatar
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Can arthropods rotate their joints?

I've been recently researching arthropod exoskeletons, and one thing I've seen more than once is that exoskeletons, due to how they work, only really allow for hinge joints. However, from seeing flies ...
ProjectApex's user avatar
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149 views

What is the difference between antennae and pedipalps?

I know insects, myriapods, and crustaceans, have "feelers" that get called antennae, while spiders and many other types of arachnids have pedipalps which seem to serve the same functions. ...
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How does Anabantoideis' labyrinth function? What does it look like?

Anabantoideis are fish with an organ that allows them to take oxygen directly from the air outside of water. However, I cannot find much on how this functions, nor can I find any clear image of what ...
E.UCIT's user avatar
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Scientific terms for front-brain, mid-brain and back-brain

I am looking for a (semi-) scientific way of phrasing "front part of brain" (part 1), "middle part of brain" (part 2) and "back part of brain" (part 3) as denoted in the ...
gmut's user avatar
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2 votes
1 answer
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Need help identifying vascular structures in brain matter

I am working on PET images of the brain. The neuro-oncologist I'm working with identified 2 large high-intensity regions as vascular structures. I've been meaning to ask what structures these are ...
nibs's user avatar
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1 answer
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Which animal has the smallest percentage of their body mass made up of water?

It's a "well known" and interesting "fact" that the human body is made up of "mostly water". With percentages from 65% to 90% often being repeated as if they were exact ...
Harthag's user avatar
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What is the thickness of the mucous, submucosal, muscular and serous membranes of the stomach wall of a piglet aged 60-75 days? (Large White pig)

There is publicly available data on the thickness of the layers of the stomach wall of piglets aged no more than 20 days. But at an early age, the thickness of the layers of the stomach wall increases ...
Vasily's user avatar
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Are ganglion cells in the foveal avascular zone served by choroidal blood supply or diffusion from retinal layer capillary beds?

I am trying to determine which blood supply (choroidal or retinal) serves the retinal ganglion cells that respond to foveal cone stimulation. I know that the fovea is supplied by the choroid, but it ...
Joe's user avatar
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How do we determine what we call "flexion" and what we call "extension"?

Question: How did we determine which motion to call "flexion" and which to call "extension" with regard to the wrist and the neck? Background: Just to set the stage, I'm not asking ...
Drew V Mouseton's user avatar
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Why porifera is classified to have an incomplete digestive system although it has no organs?

Why are we using the term "incomplete" for digestive system only? We could have also said that for circulatory system that it is either incomplete or present as a simple system. What I mean ...
Lakshya Kumar Singh's user avatar
4 votes
1 answer
89 views

Is the fin of ray-finned fish live tissue or more similar to scales?

In ray-finned fishes, are what exactly are the fins made of? Is it modified skin, dead tissue like scale or nail on humans, or something completely different? Can the fin heal?
jnovacho's user avatar
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5 votes
2 answers
587 views

Why is Heart Rate Recovery after exercise reasonably well described by a mono-exponential decay?

I have been measuring my heart rate recovery after exercise and I see that it can be fit reasonably well using a single exponential: $HeartRate(t) = HR_{max} \times e^{-t/\tau} + HR_{resting}$ This ...
MaxParadiz's user avatar
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625 views

Vertebrae looking bone found on beach in New Zealand

I found this bone on a beach in New Zealand. Does anybody have any idea which part of the body or which animal it’s from? (click to enlarge)
Nadine 's user avatar
-4 votes
1 answer
155 views

How fast does eyelid close when eyelash is triggered?

What is the reaction of blinking like when an unexpected piece of wood or something hits an eyelash and then an eyeball? A piece of stone flew into my eyeball when we knocked a wall down, and it hit ...
bandybabboon's user avatar
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2 votes
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Aren't tortoise bones fused with the shell? How did this tortoise (in the post) survive without it?

I've just read this story about a tortoise that lost a good portion of its shell in a forest fire here in Brazil and got a 3D-printed prostheses. Here's the picture of it: The way it looks like, it ...
user2934303's user avatar
3 votes
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Why is it possible to render fat if it's in cells?

To the casual onlooker, fat seems like a mass of yellow-white material, composed of lipids. Biologically speaking however, rather than being a large mass, it's actually divided among countless cells, ...
TheEnvironmentalist's user avatar
1 vote
1 answer
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Is the central sulcus the boundary between basal and alar derivatives?

The dorsal part of the nervous system typically gives rise to sensory structures, and the ventral part gives rise to motor structures. Because the central sulcus marks such a functional boundary, I ...
Mike Serfas's user avatar
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3 votes
1 answer
96 views

Are there regularly spaced connections between caudate nucleus and putamen?

There are a number of images on the Web, most beautifully Visible Body's artwork, which show the caudate nucleus and putamen linked by regularly spaced connections across the barrier of the internal ...
Mike Serfas's user avatar
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5 votes
1 answer
238 views

What is this insect wing, based on its vein pattern?

I've heard that it's possible to identify insect species uniquely based only on the vein patterns of their wings. Is this true? If so, what is this? The image is taken from an unsolved Internet ...
A. B.'s user avatar
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34 votes
8 answers
10k views

Do "shooting" animals exist?

The well-known cartoon imagery of porcupines shooting their quills at opponents in a fight is just that: a silly cartoon concept that isn't real. But it makes me wonder, does that mechanism exist ...
Mason Wheeler's user avatar
2 votes
0 answers
59 views

Is it true that oxygen levels in water limits fish size?

This answer says that breathing water is inefficient, and that may act as a limiter to the size of fish. I've heard this in a couple of other places as well, but cannot recall the sources. However, ...
Charlim's user avatar
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1 answer
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why dead mouse doesn't bleed when we cut their skin?

When we are pricked by a needle, we bleed nevertheless it's so small wound. But when we do mouse anatomy, it doesn't bleed even if we cut their whole abdominal skin. Other student asked about that, ...
cavalist's user avatar
-1 votes
2 answers
417 views

Do the nasal cilia move the particles trapped in the mucus out of the nose or down the throat? [closed]

Do the nasal cilia move the particles trapped in the mucus out of the nose or down the throat? What is the direction of the pulse of the cilia? Is this changeable?
Me Now's user avatar
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1 vote
1 answer
39 views

Infant tissues, organs, body parts or reflexes in an adult organism

What is the phenomenon, when a normal useful tissue, organ, body part or an inborn reflex or instinct existed in the infant organism and normally should disappear or at least completely lose its ...
yewgeniy's user avatar
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38 views

The position of the macula in comparison to the blind spot

Which is located in a higher postion? Macula or blind spot?
a.RR's user avatar
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-6 votes
1 answer
95 views

Animal species anatomy [closed]

https://en.wikipedia.org/wiki/Animal Do all animal species have two lungs and two kidneys similar to human beings?
Prashant Akerkar's user avatar
0 votes
1 answer
364 views

Can a hinge joint technically allow rotatory motion?

Let's use a hinge joint and pivot joint as examples. When talking about the difference between them in terms of movements permitted, I see that on any websites and textbooks, the term 'rotation' is ...
Bøbby Leung's user avatar
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0 answers
239 views

Is there any ethnicity difference in average pupil size?

I have seen some articles claim African Americans have smaller average pupils than whites while Asians have larger pupils. Is it true? link: Y. Li, D. Huang; Pupil Size and Iris Thickness Difference ...
user30303's user avatar
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7 votes
1 answer
295 views

Why exactly are the reflections of sunlight in this dragonfly's eye hexagonal?

I photographed a rather cooperative, large dragonfly today and after getting back to my desk and looking closer at the images I realized that the reflection of the Sun in its eyes produced large ...
uhoh's user avatar
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1 answer
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View and plane/section of neural tube

I have a question regarding the following image: In my book, it states that this is a dorsal view which shows the formation of the neural tube. However, isn't this a caudal view of a transverse ...
Stallmp's user avatar
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1 vote
1 answer
571 views

Why do dragonflies have these special little spots on their wings?

The wings of several kinds of dragonflies I've seen here in Taiwan all have an apparently special little pigmented spot near the ends of each wing. Does this spot have a name and a function? below x2: ...
uhoh's user avatar
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1 vote
1 answer
133 views

What exactly is "lateral septum"?

I came across the phrase lateral septum and I can't seem to find the precise definition online. Is it "the areas roughly to the right and the left of the septum pellucidum"? Or is it the ...
CopperKettle's user avatar
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-1 votes
2 answers
656 views

What's the difference between the terms "muscle" and "muscle organ"?

Foundational Model of Anatomy distinguishes between Muscle organ and Muscle. What's the difference between the two?
Christian's user avatar
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0 votes
1 answer
168 views

Can the shoulder bones grow after the growth plates have fused?

Body builders have broad shoulders. If one start lifting weights after one's growth plates have fused, can one still increase the width of one's shoulders? If yes, does that mean shoulder bones can ...
user avatar
2 votes
0 answers
29 views

In what ways does the number of legs affect an animal's functioning?

After much research, I've only been able to find specific examples of leg-number's impact on locomotion and dexterity (and/or object manipulation). I feel as though there must be other ways it has a ...
cschimpf's user avatar
4 votes
1 answer
208 views

What is the function of epiglottis?

The last time I came across this question was when I was in high school. And the explanation I was given is that epiglottis works like a valve, it prevents foods from getting into the windpipe. Still, ...
Ahmed Abdullah's user avatar
8 votes
1 answer
6k views

Is the 6th rib attached to 7th rib, and 7th rib to 8th?

I'm just confused between a lot of pics that draw the thoracic cage in their way. what are these white things that I've shown? or why the 7th rib is attached to the 8th?
Amin's user avatar
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