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Questions tagged [anatomy]

The study of the structure of organisms and their parts.

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Why do our bodies maintain blood pressure but not the flow rate?

This might be a silly question but i'm not not clear I'm always told that blood pressure is homeostatic parameter and can't not be changed but isn't what important is the flow rate to the organs? ...
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1answer
40 views

Is there an adjective I can use to describe body parts like hands, feet, eyes, and ears that exist on both sides of the body's sagittal plane?

Body parts like human hands, feet, ears, eyes, etc. exist on either side of the human body's sagittal plane and can therefore be specified with the adjectives left and right. Is there a special ...
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1answer
47 views

How are fingerprints formed?

I know what influences the fingerprints to be unique always. But what actually process is taken to make these as we grow?
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8 views

Could a high TSH level mean a problem with the pituitary gland? [migrated]

When our physician suspects we might have a problem with our thyroid he sends us to check the TSH level in our blood. If there is a lot of TSH in the blood it means that the thyroid can't work quickly ...
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1answer
43 views

Why does sympathetic activity constrict pulmonary vessels?

I don't know understand why sympathetic stimulation constricts pulmonary vessels? I thought that the sympathetic nervous system activated the body for physical activity. Physical activity would need ...
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0answers
10 views

What is the optimal time to implant embryo in uterus for in vitro fertilization?

What is the best time to implant an embryo in the uterus. I was under the impression that the earlier the better and more natural, but also if you wait until the blastocyst age, it may be better to ...
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1answer
25 views

Is the mesenterium a synonym for the mesocolon?

On biodigital anatomy browser I found a structure called the mesocolon. I didn't find the term in Uberon and I'm unclear whether it's simply a synonym for mesenterium or whether it's a separate ...
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1answer
55 views

What does 'proper' mean in the anatomical context?

I've seen the word 'proper' in websites, lectures, etc., in the context of human anatomy. But I'm unsure as to what its definition is. For example, the 'oral cavity proper'.
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229 views

Average width of the male body

I've been looking for the average width (at widest point) of the average American male body but couldn't find it anywhere so far. When I say "widest point", I mean that if you draw a rectangle (that ...
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0answers
61 views

How “unique” human vagina is?

Regading penis Dixson showed that it is not really unique and complex. This argument (and there were some others) was used against the idea of human polygynandry. But what about vaginal shape? I know ...
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1answer
34 views

Common english name for tissues which are separated from the blood by blood-tissue barriers

Which general term is used to denote such organs/tissues as: brain, testis, thymus etc., which are separated from the blood by blood-tissue barriers?
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Biceps contraction

i am currently developing a mechanomyography device to read biceps muscle shortening during biceps curl. My result shows that as the weight is increased, (1.25, 2.5 and 5 kg), the muscle will shorten ...
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0answers
27 views

Do birds have quadriceps and thighs fused into their hips?

I'm looking at 3D modeling a large bird like an emu or ostrich, but I don't know how the muscles surrounding the femur connect to the hips/back. It seems weird that the entire thigh and quadriceps ...
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0answers
49 views

What does “molecular” mean in the context of anatomy, for example the molecular layer of cerebral cortex

The first apical layer of the cerebral cortex is also called as the molecular layer, I could not find the exact reason of the naming. What I found: Molecular alongside its primary meaning in ...
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1answer
59 views

Are there any anatomy books focusing on etymology?

I noticed that I can remember names for a very long time if I now their etymological background, the reason is easy I love etymology, especially when it is connected to mythology. However when I learn ...
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1answer
1k views

Ventricular Filling : Systole or Diastole?

As the Blood goes down from the Atrium to the Ventricles: The Tricuspid Valve ( Right Atrioventricular Valve) Bicuspid Valve (Mitral Valve ) The atrial pressure is INCREASES WHEN ATRIA ( THE ATRIA ...
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85 views

Is this claim about equine anatomy true?

While bumping through obscure corners of the Internet, I encountered the following image posted somewhere. The horse anus is a marvel of evolutionary biology. Like most mammals, rhythmic ...
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0answers
49 views

What does it mean for sodium and water reabsorption to be “coupled” in the nephron?

If sodium is transported across the tubule membrane down the concentration gradient established via the $Na^+$/$K^+$ exchanger via symport with glucose and antiport with hydrogen, and water is ...
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0answers
36 views

Anatomy of heart

What is an auricle and is there any similarity between auricle and ventricle or atria because in my anatomy book many times the author refer to auricle as ventricle?
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1answer
552 views

What are the max angles of human eyeball rotation?

How much can our eyeballs rotate towards the nose, away from it, towards the top and bottom?
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1answer
2k views

Why do eyes change colour after death?

Why exactly do eyes turn black when we die? (Or even change colour at all). The source of inspiration to this question is due to this video https://www.youtube.com/watch?v=6mNs_TcUyHc&t=627s (it's ...
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1answer
72 views

Are the transverse septum in sharks and the diaphragm in mammals homologous structures?

Are the transverse septum in sharks and the diaphragm in mammals homologous structures? I have searched on Google Scholar and Web of Science, but haven't found substantial evidence to prove or ...
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1answer
57 views

What are the small lumps in the mouth of the fish, and what is its function?

Today I was performing a fish head dissection to investigate the gas exchange process in biology. Then when I opened the mouth I noticed these small hard structures at the base, I assume they may be a ...
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0answers
549 views

Are humans anotomically herbivores? If so, why do many say we are omnivores?

I'm fairly curious about whether someone can provide me with reliable sources constituting humans are omnivores, and not herbivores. I know that this might come off as stupid, ignorant, idiotic or ...
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1answer
252 views

How can paleontologists identify morphologically different fossils as members of the same species?

I recently saw a documentary about Tyrannosaurus rex, which detailed the growth stages of the dinosaur. Apparently, it underwent a huge growth spurt at around 14 years of age, growing into the massive ...
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1answer
53 views

Who were “Dawson and Wilson” (mentioned as authors of an embryonic postmortem examination method)?

A sentence from a Russian text I'm translating: Following the drug administration period, the pregnant animals were euthanized in order to examine the embryos using the method developed by Dawson ...
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1answer
70 views

Why did some animals evolve inward-slanted legs?

Something I noticed looking at reference images is some animals have legs that are slanted inward relative to the length of their body, like in the two images below. Why have animals evolved this ...
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0answers
50 views

How do emus/ostriches/rheas have their upper leg connected to the rest of their body?

I'm working on a model for educational graphics of an emu in conjunction with other information, but there aren't a lot of great reference images. The thing that's most unclear is how the upper leg ...
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0answers
77 views

Which word is used to indicate that a vessel is “blood-filled” during a necropsy?

I'm translating a necropsy report, and one sentence says: Синусоиды полнокровные. Портальные тракты сохранены, сосуды умеренно полнокровные. The sinusoids are plethoric. The portal tracts are ...
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1answer
37 views

Why do some insects constantly move their abdomens?

Why do some insects, such as wasps, constantly move their abdomens?
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0answers
54 views

What are these white spots surrounding this deer corpse?

This deer died near my street and I wanted to get some pictures up close, besides the foul smell of decomposition I noticed these white spots. I’ve been curious and since I would like to research what ...
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2answers
251 views

Can you tell if a corpse was male or female by only examining its skull?

There are articles that says women have more rounded corner faces than men, than women noses are usually shorter, etc. But are those (and other features) tendencies or deterministic features that ...
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3answers
86 views

How do our sensory organs work automatically without our conscious effort? [closed]

I wonder how our different sensory organs (e.g., eyes, nose, ears, etc.) work automatically without our conscious efforts or without our command. We don't have to tell our eyes how to see, our ears ...
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1answer
2k views

Ipsilateral vs contralateral side of body

I know that the dorsal columns carry ipsilateral information. Is this fact relative to the dorsal column in question? If I want to talk about the right dorsal column, then the right side of the body ...
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1answer
633 views

What is the function of the Hyoepiglottic ligament?

The hyoepiglottic ligament (ligamentum hyoepiglotticum) is an elastic band that connects the epiglottis to the hyoid bone. Although I can find information about the clinical significance of this ...
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2answers
465 views

What are the (correct) terms for these flagella-arrangements?

I came across the following diagrams depicting two kinds of arrangement of flagella over cells. Now according to my (very unreliable) school textbook, the arrangements are termed as: A - ...
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4answers
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How come large herbivores have such thin legs?

Edit: This question is very similar to this and related to this one (though the latter focuses on homology instead of scaling laws). However, the answer to this question is far more comprehensive, in ...
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2answers
2k views

Terminology for parts of the leg

Going out on a limb here (pun intended)...I'm writing a paper in which I need to refer to various sections of the human leg from upper thigh to knee to calf and ankle. However, "calf" covers a fairly ...
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1answer
28 views

Do the individual claws of a bear have names?

The question seems pretty self-explanatory (if perhaps a little odd). Anatomical names or colloquial names are both appreciated, especially the latter if they exist.
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1answer
27 views

I need a site for online courses

I need a site which has online courses for anatomy of limb and head and neck and also embryology, so far I have used www.coursera.org and it was really organized and helpful but unfortunately it does ...
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2answers
98 views

Is it possible for a man to survive around 20 bullets? [closed]

A man was shown being able to survive after around 20 bullets shot him in a movie. The bullet cover was fairly random, but anyway, is there any possible way for a person to survive 20 bullet shots? I'...
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2answers
288 views

How do you consider an organism to be a new species? [duplicate]

How do you consider an organism to be a new species? Can a new parthenogenetic organism be considered as a new species?
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0answers
119 views

Are there predefined implantation sites in mammalian uterus?

I do surgical embryo transfer of genetically modified (microinjected) mouse embryos (at 1 or 2 cell stage). As most of the constructs are new, we expect that it may affect birth rate. In case there ...
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1answer
167 views

How are neural pathways discovered?

I have seen the spinal cord and it's a white, soft, slippery cylinder that has a small diameter (about 25-30 milimeters). It absolutely doesn't have a macroscopocally reticular texture that would ...
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0answers
46 views

What is the biggest structure in nature for structural coloration?

I'm interested in the actual sizes behind structural coloration: I find it fascinating and I think it may have a couple very nice applications. The problem is I couldn't find anything but vague ...
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1answer
478 views

What purpose do the opening(s) serve in diapsid and synapsid skulls?

Did synapsid skulls evolve from diapsid skulls or vice versa? Aditionally, do birds have diapsid skulls? The research I have done has yielded some mixed results.
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0answers
858 views

Kidney transplant and adrenal glands

When a kidney is transplanted from a donor to a recepient does the surgery occur keeping the donor's adrenal gland intact over the kidney or is the kidney minus the adrenal gland over it transplanted ...
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1answer
23 views

How much smaller is the diffusivity of a molecule in the retina as opposed to the vitreous of the eye?

I'm interested in the diffusivity of macromolecules inside the mammalian retina, relative to the vitreous. For example is the diffusion coefficient for a macromolecule (protein, 50-150 kDa for ...
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2answers
5k views

Are tendons and ligaments classified under the muscular or bone system?

Are tendons and ligaments classified under muscular system or bone system? Basically they are not bones or muscles and that's why I have doubt.
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1answer
555 views

Animals with substantial five-fold symmetry besides starfish? Any land animals?

Animals with four, six and eight legs are widespread while the concept of seven legs (fictitious Heptapods) are the makings of amazing scifi short stories and blockbuster movies. Are starfish the ...