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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7
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1answer
203 views

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 image ...
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0answers
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Flexor/extensor group in lower arm and limb bud rotation

Have the flexor and extensor groups in the lower arm have rotated laterally 90° towards the humerus epicondyles independently of the rest of the lower arm? The pre-axial and post-axial veins are still ...
13
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0answers
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Do patella bones form in people born with the inability to walk?

The patella is a sesamoid bone that typically doesn't completely from and ossify until ~3-6 years of age (e.g., Source). My long-standing understanding (supported by a claim in Saladin's college A&...
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0answers
32 views

What is the thinnest spot on the ilium called?

Is there a specific name for the spot on the human iliac fossa where the bone is the thinnest? (Or, is there a name for the thickness measurement of that spot, e.g. the left/right _________ is 2.1mm?) ...
4
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1answer
1k views

What's so special about Chassaignac tubercle?

1-How does massaging of carotid artery at chassaignac tubercle( anterior tubercle of transverse process of C6 vertebra ) can relieve the symptoms of Supraventricular Tachycardia? My attempt: I think ...
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0answers
31 views

The position of the macula in comparison to the blind spot

Which is located in a higher postion? Macula or blind spot?
0
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1answer
537 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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6answers
43k views

What makes humans omnivores, and not herbivores?

Some vegans claim that humans are herbivores, not omnivores, and that we are not physiologically designed to eat meat (see here: http://www.peta.org/living/food/natural-human-diet/). "According to ...
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1answer
40 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?
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1answer
54 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 ...
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0answers
17 views

Is there empty space left in the skull after the second set of human teeth grow out? What happens to it? [duplicate]

Reading about teeth on this website, I came across this link and picture of a human child skull, where we can see how both sets of teeth are placed. It made me wonder: after the second set of teeth ...
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0answers
31 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 ...
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1answer
105 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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0answers
39 views

Is the diaphragm made of two muscles?

Is there a 'crural' and 'costal' parts of the diaphragm as suggested in this paper or is it just a single muscle?
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0answers
16 views

How do Human Skin Creases Vary?

I am studying human gross anatomy in order to produce an anatomically correct CGI model of the human body. As part of this, I'm attempting to understand the different features that define the ...
1
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1answer
38 views

Why proprioceptive fibres (of CN V) have their cell bodies in mesencephalic trigeminal nucleus?

It's seen that GSA (General Somatic Afferent) fibres (of CN V) have their cell bodies in trigeminal ganglion. But the proprioceptive fibres' peripheral processes terminate at mesencephalic trigeminal ...
293
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3answers
277k views

Why do I only breathe out of one nostril?

I was just sitting with my hand next to my nose and I realized that air was only coming out of the right nostril. Why is that? I would think I would use both, it seems much more efficient. Have I ...
1
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1answer
23 views

Pectoralis muscles as push muscles vs pull muscles

Pectoralis muscles are the adductors, flexors of arm in addition to medial rotators of arm. How does this action translate in to acting as helping in push ups or in bench press? I am having trouble ...
2
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0answers
6k views

What is the occipital bun, precisely (in Neanderthals and Homo Sapiens)?

I've read that the occipital bun is an anatomical feature of the Neanderthals, and only because modern humans (except sub-Saharan Africans) carry a few percent of Neanderthal DNA due to ...
8
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1answer
215 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?
2
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0answers
25 views

Clarification for the anatomical terminology of the cerebellum

I've been trying to find descriptions for some of the fissures found on the inferior surface of the cerebellum, and so far the only source I've been able to find that provides an adequate description ...
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0answers
44 views

Phantom Limb | Is that even possible?

I am fascinated by the fact that an amputee can control their robotic arm by thinking of the actions they would normally execute when the limb was present. The mind sends signals to the nerve endings ...
2
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1answer
218 views

Reference to hypothesis about breast sexual attractiveness?

Some time ago there was a hypothesis published,suggesting evolution made breasts mimic buttocks for either primitive men being attracted to women when they started to walk on two legs, or to ...
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0answers
13 views

Repartition of tendon sheaths in humans

As a medical student I have been taught that tendon sheaths are found predominantly in the wrists, hands and ankles. However, I learned recently that tenosynovitis often affect the biceps brachii. It ...
16
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1answer
3k views

Why are the pulmonary vein and artery not like the rest of circulatory system?

I'm learning anatomy. What I learnt is that we have arteries that have oxygenated blood which appears red in color, and branch blood to arterioles to deliver blood to cells via capillaries from where ...
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0answers
15 views

Can the eye determine which type of defocus is presented to it?

I have a question regarding myopic and hyperopic defocus. My question is, is the eye able to determine which type of defocus is presented to it and if so what mechanisms allow it to distinguish ...
2
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1answer
107 views

Can the human eye axial length decrease?

I just have a quick question regarding the axial length of the eyeball. I understand that the axial length of the eyeball grows up until your around 20 years of age which is why hypermetropia ...
13
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5answers
18k views

Why is the opposite of plantar flexion called “dorsiflexion”?

Why is the action of flexing the foot so that the toes move anteriorly/superiorly (i.e. in the direction opposite that which they move during plantar flexion) described as "dorsiflexion?" In the same ...
2
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1answer
50 views

is there a limit to how much humans can taste?

kind of a weird question, sorry, but i was wondering--is there a threshold at which our taste buds become overwhelmed? if i, say, put some supersweet compound in my mouth, would there be a point at ...
3
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1answer
21k views

Do women tend to have longer legs and shorter torsos than men?

I've always heard that women tend to have a greater leg length to torso length ration than men, and I think that my anecdotal observations of pedestrians of both sexes tend to confirm that. However, ...
0
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1answer
57 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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0answers
14 views

What's the difference between the terms “muscle” and “muscle organ”?

FMA distinguishes between Muscle organ and Muscle. What's the difference between the two?
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0answers
46 views

Where can I find anthropometric data for different ethnicities?

I get that this is a sensitive topic, but please trust me, the very reason I'm asking is because I want to represent a people properly. There's a video game where peoples of different ethnic ...
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2answers
91 views

Are “sympathetic nerves” the same as “cardiopulmonary splanchnic” nerves?

I've gathered from a number of sources (e.g., Patel (2015), Wikipedia, and here) that the sympathetic nerves leaving the sympathetic trunk to innervate the heart and lungs are called "cardiopulmonary ...
11
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2answers
233 views

Are there certain symmetric-pair muscles that are slightly bigger and NOT due to handedness?

Ok, hear me out, I was just thinking about an article in Nature I read in the past titled "Scrotal asymmetry in man and in ancient sculpture"$^{\dagger}$ and more recently an entire medical textbook ...
0
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0answers
10 views

Why are the retina layers arranged the way they are? [duplicate]

The retina layers are arranged in such a way that light has to pass through several layers before hitting the photosensitive cells. Won't this be much better if the photosensitive cells made up the ...
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2answers
65 views

If black absorbs light, then why did Africans evolve black skin? Wouldn't that make the heat worse? [duplicate]

Wouldn't it have been more adaptive to develop light skin and so reflect incoming light?
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0answers
41 views

Profile of a human foot

I am not sure if this is the right place to ask this question, so please let me know in case it is not. My question is just out of curiosity. What is the reason for curved human foot profile? First ...
3
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1answer
165 views

In endochondral bone formation, why does only hyaline cartilage get ossified to form bone?

There are three types of cartilage: hyaline, fibrous and elastic cartilage. Fibrous cartilage does not have perichondrium...so it does not take part in ossification because perichondrium needs to ...
3
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0answers
56 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 ...
6
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0answers
808 views

Does variation in human gut length vary predictably with diet of ancestors?

Background: Numerous online searches, textbooks and other sources seem to pin the average length of the human gut from mouth to anus (oroanal) between about 5-10m in length. To pick a reputable ...
4
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1answer
94 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, ...
-3
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1answer
67 views

Why do humans have flat faces, as compared to chimps?

Apparently adult, particularly older human faces resemble infantile chimps more tham they resemble any other adult hominid. And adult humans even have as many body hair follicles as infantile chimps. ...
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1answer
56 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 ...
4
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1answer
13k views

Why can't people talk while inhaling?

Why do we have to exhale in order to talk? From looking on Wikipedia, it seems like it has something to do with the glottis, but I'm not clear on the mechanism that makes speech sound so different ...
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0answers
86 views

Why do arteries have a small lumen? [closed]

My biology textbook says that arteries have a small lumen relative to the thickness of their walls. I understand why they need thick walls, to withstand high pressure and stretch etc. But when ...
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1answer
88 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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0answers
10 views

Is superior surface of bladder covered with visceral peritoneum OR parietal peritoneum?

As above. I am confused about the definitions here. Is it the case that every time the peritoneum touches an organ it becomes visceral peritoneum?
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2answers
1k views

Special visceral efferent

Why are special visceral efferent nerves are named as such? They are supplying motor impulses to muscles of pharyngeal arch, which are both skeletal(facial) and visceral(laryngeal) 1, so why only ...
0
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2answers
149 views

What is the easiest way to measure a human body surface area? [closed]

Looking for accuracy, cost-efficiency, and speed: this could provide useful information for determining individual bioinformatic calculations, pertaining to, for example cell type estimation, for ...

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