Questions tagged [anatomy]

The study of the structure of organisms and their parts.

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11 views

Why don't bats have a huge sternum like birds do?

I know birds have a big sternum to anchor the wing muscles to. Bats also have wings. So why doesn't the bat also have all that wing muscle support? How do these two kinds of animals work differently ...
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Does any tendon in humans receive a high amount of blood supply? Or is the property of not receiving a large blood supply a constant across tendons?

I read on https://www.physiocomestoyou.co.uk/blog/all-you-need-to-know-about-tendons/ (mirror): [Tendons] do not have a large blood supply. Does any tendon in the human body receive a high amount of ...
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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 ...
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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 ...
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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, ...
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1answer
61 views

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, ...
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2answers
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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?
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1answer
31 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 ...
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80 views

Do all tendons have either a synovial sheath (a.k.a. true sheath) or a paratenon (a.k.a. false sheath)?

I have read the following {1}: According to their envelope, tendons can be divided into tendons within a synovial sheath (i.e., sheathed tendons) and paratenon-covered tendons. This means that all ...
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34 views

The position of the macula in comparison to the blind spot

Which is located in a higher postion? Macula or blind spot?
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Animal species anatomy [closed]

https://en.wikipedia.org/wiki/Animal Do all animal species have two lungs and two kidneys similar to human beings?
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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 ...
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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 ...
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How do myosins cause myofibrils to be shortened?

I know that it is the binding and tilting of myosins on actins that cause the sarcomere to be shortened. But I am a little bit confused about the details. The structure of a sarcomere is made of ...
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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 ...
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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 ...
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1answer
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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: ...
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1answer
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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 ...
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How do naked mole rats suckle when their lips are behind their teeth?

Lips are believed to be needed in mammals so that we can create an ample seal for suckling milk, and while I'm aware they /do/ have lips and can create a seal, they are behind the teeth. How do they ...
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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?
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62 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 ...
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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 ...
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1answer
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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, ...
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562 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?
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Why do vertebrates have an oesophagus?

As far as I know, the oesophagus in vertebrates has no digestive or absorptive function. It is simply a conduit from the mouth to more distal parts of the gastrointestinal tract. Why have it at all, ...
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How can a joint extend or flex?

The idea of a joint flexing or extending doesn't make sense to me, I can see how a leg or an arm might extend or flex but how does a joint extend or flex ? "The hip joint is most stable when it is ...
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Do endocrine cells always lie adjacent to capillaries?

The circulatory system transports plasma contents to the body via the interstitial circulatory system, reabsorbed with the lymphatic system. Cell metabolism "waste products" are transported into the ...
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85 views

Why is the thyroid gland in the neck?

The neck seems like an odd place for it. All other neck anatomy must interface between the head and abdomen (trachea, esophagus, circulation, spine etc). Surprisingly I have not been able to find ...
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Origins of the body mechanics theory

In physical therapy and occasionally in sports coaching, there's often a precise description of the mechanics of what happens during the movement (which muscles are engaged, which joint moves where ...
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Can a Chihuahua and a Great Dane breed the “old fashioned way?”

I saw this vid: https://youtu.be/eu2qe-FNtjg And this question crossed my mind. The dog in the video seems to be boxer sized... And I wonder if that strategy would work with something a little ...
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Is there a conformal transformation that maps the skull of Panthera tigris to the one of Panthera leo?

While visiting the Museum of Natural History in Rouen a few months ago, I was stunned by the similarity between the skulls of Panthera tigris and Panthera Leo: the overall shapes were very similar and ...
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63 views

What are the upper and lower sets of teeth are called?

I'd like to know the correct term for the a group of teeth in the skull and jax (mandible) Not the specific types of teeth i.e molars, incisors, carnassials, canines etc but what a set of teeth get ...
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True anatomical/physiological explanation for “metaphysis” etymology

The anatomy textbook1 I use for my students states that the prefix meta- means "between:" The metaphyses (me-TAF-i-sez; meta = between; singular is metaphysis) are the regions between the diaphysis ...
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Evolution of recurrent laryngeal nerve in a giraffe [closed]

Do natural selection and survival of the fittest explain the divergent length of the recurrent laryngeal nerve...centimeters in the human, 15 feet in the giraffe?
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199 views

What fills the space between the alveoli in the lungs?

Do the lungs just consist of a large tree of alveoli, covered by the pleura, like this picture: Or are they found "inside" the sac that is the lungs? If it's the later, what fills the space ...
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Why do neutrophils have segmented nuclei?

To clarify, I'm not asking what causes high segmentation in neutrophils. I'm asking how segmented nuclei function in a regular neutrophil cell.
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What are the differences between the margins of the lateral and medial condyles of the tibia?

During an osteology lecture about the bones of the leg, the professor mentioned that the posterior (i think it was the posterior at least, I didn't write my notes down very well) margins of the ...
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What causes the shape of the dense structure in this “giant squid egg” sac?

The YouTube video Swimming Next To Giant Squid Egg shows a giant egg of a squid and/or an egg of a giant squid. Text in the video's description includes the text quoted below, which indicates that the ...
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is there any kind of paw/pads lines or paw muscle anatomy in animal hands?

just like in the title my question is, is there any kind of paw/pads lines or paw muscle anatomy in animal hands? or its pretty much random? example like mammary lines as bilateral structure that ...
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Medical terminology for asymmetrically-shaped paired body parts?

Some people have different sized feet [source], a limb that is slightly longer than the contralateral (on other side of the body) limb [source], or other instances of paired body parts being different ...
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Can anyone help me identify the size of a mantis shrimp club?

The mantis shrimp punches with it's club to destroy its prey's shell. I found on the internet that its body size is around 4 inches. What's the size of it's club?
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272 views

Do male skunks have teats?

Simple question. Do male skunks (striped skunk, eastern US/Canada if it matters) have teats? Occasionally want to identify road-kill, but don't know if teats are diagnostic for females. I believe ...
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1answer
161 views

(How) do horizontal pupils dialate?

I was looking at mongoose eyes in particular, but my understanding is: Circular (human-like) pupils simply get larger/smaller depending on light levels, no change in "shape" Vertical slit (cat-like) ...
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1answer
118 views

Can birds touch their wing tips together either in front or behind (not above and below)? [closed]

Can the tips of a birds wings touch so that it would form a ring if view from above or below? I suspect it might be a bird of prey and at the moment it is picking something up from the ground but I ...
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227 views

Movement of the Thoracic Cage During Movements of the Thoracic Spine

Just for a bit of context: I am trying to create a 3D digital model of the human skeleton as the first step towards computer generated muscle simulation, and as such I want the skeleton to be as ...
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For each movement performed by both the gluteus minimus and medius, what percentage of the movement do the gluteus minimus and medius account for?

From what I read on Wikipedia, all functions of the gluteus minimus are mirrored by the gluteus medius. Additionally, the gluteus medius is larger than the gluteus minimus (see comparative images here)...
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Does a full tear of the gluteus minimus tendon result in a long-lasting inflammatory response?

Does a full tear of the gluteus minimus tendon result in a long-lasting inflammatory response? This answer mentions: An isolated gluteus minimus tear still causes functional problems because of ...
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Does a full tear of the gluteus minimus tendon has any functional implications?

From what I read on Wikipedia, all functions of the gluteus minimus are mirrored by the gluteus medius. Additionally, the gluteus medius is larger than the gluteus minimus (see comparative images here)...
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53 views

How many different states can the femur and lower limb be in?

Often the knee can be thought of as a hinge joint. However, when it flexes, the knee permits the lower leg to rotate. So it is not a pure hinge joint in absolute sense because it permits more range of ...
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Where can I find the list of all tendons in the human body?

https://www.healthcentral.com/article/aging-can-take-major-toll-on-womens-tendons (mirror) claims that: There are about 4,000 tendons throughout the body. This claim is echoed by a fair amount of ...

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