Questions tagged [human-anatomy]

This tag is for questions about the general anatomical features of human beings as opposed to the anatomy of non-human animals.

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34 views

Question about the anatomy of the human eye [closed]

Is there any part in the human eye that is responsible for keeping light out, or are all the parts of the eye involved in absorbing the light and allowing it in.
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What causes your 2 eyes to move in sync?

When you look left to right or up to down, youre 2 eyes move in perfect harmony. What nerve/system causes this coordination? I.e. could you tell me more about this system? Thanks
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67 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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29 views

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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1answer
47 views

Is the backward positioning of photoreceptors bad design?

(Several questions have been asked about this topic but most are quite old and there has been at least one study since then that has attempted to answer this in a new way) Since photoreceptors are ...
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1answer
76 views

Genes associated with human female breast size

What are the genes associated with female breast size and natural variation thereof in human beings?
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What are the differences between internal organs between sub-saharan Africans and Northern Europeans

Lets take as examples a typical Norwegian and a typical Nigerian. In terms of human anatonomy the outer differences are more obvious e.g. (on average) White skin vs dark skin Pointy nose vs broad ...
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1answer
33 views

Does cartilage connect to other cartilage?

In the definition of a Ligament in Oxford states: A short band of tough, flexible fibrous connective tissue which connects two bones or cartilages or holds together a joint. the wording of "two" ...
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1answer
70 views

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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1answer
57 views

Why is there disagreement on the number of surfaces of the human heart?

I am finding that some state that there are 5 and some that say that there are 3. For example, "Cardiology: An Integrated Approach" that was published in 2018 states that There are 3 surfaces of ...
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17 views

What's the function of vitelline circulation in human embryo?

Why do we need a vitelline circulation if we already develop a placenta to gather all the nutrients we need? Is it an evolutionary remain?
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How much blood do we have when the heart first starts to beat?

How much blood do we have when the heart beats for the first time? It should be between the third and fourth week of embryonic life.
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Reflex muscular activity in three months old fetus

At the end of the third month, reflex activity can be evoked in aborted fetuses, indicating muscular activity This quote is from Langman's Medical Embriology. Have I misunderstood it or it is ...
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What does lymph actually look like?

I have scoured Google and a number of my anatomy textbooks for a picture of lymph. However, I cannot find any such photo (or video) showing its actual appearance. Can someone provide a reputable ...
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1answer
70 views

Why does smoking change the human voice?

What happens to the biology of the voicebox of smokers? Women's voices can change to croaky men's voices, and vaper's voices develop "white noise" content, like a TV set to static, compared to their ...
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pH on skin penetration of salicylic acid

I have found that at lower pH, there is more free salicylic acid (due to pKa of roughly 3), which is neutral/uncharged and then can penetrate the skin's oils which are non-polar. At higher pH, more ...
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How does salicylic acid (2-hydroxybenzoic acid) break down desmosomal proteins to exfoliate skin?

I've been searching for an explanation to salicylic acid's property of being able to break down desmosomal proteins, such as desmogleins in order to disrupt the outer layer of skin. Can someone ...
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1answer
39 views

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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1answer
59 views

Does the cranial dura consist of the periosteum? and if not, then is there a mistake in my textbook?

My textbook (Neuroanatomy an illustrated colour text) states that: The spinal dura and much of the cranial dura are separate from the periosteum, which forms the inner lining of the surrounding ...
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30 views

Biological & Evolutionary Reasons for Palm (Bi)Symmetry

The fingers of the human palm exhibit a (bi)symmetrical pattern with regards to their size, in the sense that the thumb and the pinky are almost the same size, and the same holds for the index and ...
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1answer
53 views

How does energy conversion happen (chemical to mechanical?) in moving body muscles?

From my understanding, the brain sends electrical pulses through neurons to different part of the body to initiate a movement. My question is, how is the movement realized? For example, in a train, ...
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2answers
83 views

Why do red muscle fibres have more mitochondria than white muscle fibre but less ATP than White muscle fibres?

This is a question given in my Anatomy book and I am really confused because logically the substance which have more mitochondria should have more ATP as mitochondria is the power house of cell.But ...
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1answer
34 views

Human Anatomy and Physiology - The Muscoskeletal System

In the human limb skeleton can you identify a bone which is rather feeble and does not have much role in supporting body weight or maintain posture, and doctors use pieces of it to transplant to other ...
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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 ...
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1answer
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Can the word phalanx also be used to describe the finger bone plus the soft parts around the bone?

I was talking in an SE chatroom about fingers, and not being a native English speaker, I had to look up the word used for the part of a finger from the tip to the closest knuckle. I came across the ...
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151 views

What are the coverings of femoral hernia?

It was my Viva question and I was really puzzled.I know what is femoral hernia and it route like the abdominal content moves down the femoral canal and further through the saphenous opening and all ...
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Human femur maximum strength

In this video https://www.youtube.com/watch?v=os98s9kBlOI it is demonstrated that a moose leg bone can support until nearly 10 tonne before break. Is there any similar demonstration on human femurs? ...
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1answer
82 views

Are there any benefits/disadvantages/traits from having a permanent lower core temperature?

My body temperature as far as I remember has always been around 35.6 degrees Celsius, that's a degree less than what is the usually quoted as the average temperature for humans. Are there any known ...
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44 views

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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1answer
33 views

can auditory/ocular reflexes exist?

In the same way the knee-jerk reflex is a thing (I think the nerve signal doesn't go through the brain?), can stimuli received by the eyes or ears trigger "instantaneous" (faster than the brain can ...
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33 views

Can we “learn” reflexes?

Can we force our bodies to react to situations faster than our brain can think about them? Some reflexes I can think of off the top of my head: knee jerk reflex retracting hand when touching a hot ...
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Is medullary cavity totally absent in clavicle?

In one of my books it said that medullary cavity is totally absent in clavicle but is it completely true ? One of my teachers said only the medial 2/3 of clavicle has a medullary cavity.
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1answer
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What forms this pad on the side of the face?

I've been trying to figure out this for the best portion of this morning, but what structures are responsible for the pad highlighted in red? (sorry for low quality of picture, was just watching the ...
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Where would I point to if I wanted to indicate the location of the anterior insular cortex?

I understand research suggests the anterior insular cortex is where human empathy originates. The images I found researching the location of the AIC do not give me a clear sense of where it is in ...
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What are the sufficient criteria that make an entity a living homo sapiens? [closed]

When I say criteria I mean like x biological functions or y genetics. If it were to be appearance,anatomy. A corpse completely looks like a man. Moreover a person who has had their 4 limbs amputated, ...
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2answers
162 views

Why does flicking a finger generate so much more force than extending it quickly?

Flicking a finger (holding it back with e.g. the thumb while building up "pressure" against the thumb, then releasing) is much more powerful than just uncurling the finger quickly. I tried to do the ...
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1answer
304 views

Why are human bones usually curved?

Is there any simple explanation as to why human bones are more curved than straight and are thicker at ends and thinner in the middle?
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2answers
170 views

Why don't we speak of medial and lateral rotation of the forearm? And pronation and supination of the upper arm?

Why don't we speak of medial and lateral rotation of the forearm? I notice we speak of forearm supination and forearm pronation, but why not medial and lateral rotation. It seems to me that if we ...
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1answer
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Surface perception

I'm looking for research studying: How small and compressed together do particles of a surface need to be to be perceived as solid surface to human touch? E.g. sand still feels grainy. Has there been ...
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33 views

Are your finger muscles and tendons interconnected?

Are finger muscles and tendons interconnected? If they are interconnected, then if i exercise one finger will it train the other fingers since they are interconnected and share the same muscles in the ...
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54 views

ATP and Muscle Contraction

I have a question regarding how molecular interactions manifest in physical actions - such as hanging from a bar. To the best of my understanding, when it comes to the contraction of muscles, ATP is ...
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130 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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32 views

For how long can the heart be in asystole and then restart itself?

The medication Adenosine is used for the treatment of some abnormal heart rhythms. However, according to Wikipedia, it can cause asystole for a few seconds: Because of the effects of adenosine on ...
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1answer
140 views

Passing out from drowning [closed]

How long does it take to pass out from oxygen deprivation? The person is panicked and screaming so they accidentally breathe water into the lungs. So how long would it take for them to pass out? After ...
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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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1answer
42 views

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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1answer
44 views

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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1answer
52 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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136 views

What is the significance of different types of papillae present on tongue?

Fungiform, Circumvallate, Filiform, Foliate Papillae are present on the surface of the tongue. They have a role in increasing surface area for taste buds that can be accommodated on the tongue. Each ...

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