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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2answers
759 views

Are there genetic causes underlying the difference in circumference of the upper arm and foream?

Is there any genetic reason for the difference in size between the upper arm and lower arm (i.e., the forearm)? In most women, it seems that the upper arm is larger in circumference than the forearm. ...
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1answer
379 views

Why is the central tendon of diaphragm called a tendon?

Why is the central tendon of diaphragm called a tendon when it does not connect the diaphragm to any bone?
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1answer
2k views

What is the depression between bridge of nose and brow called?

In a human being, what is the depression often found between the bridge of the nose and the brow called?
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1answer
111 views

When is an anatomic entity named “laterale” vs. “lateralis”?

I'm trying to learn the latin names of anatomical entities and I have a hard time remembering whether it's "Os cuneiforme laterale" or "Os cuneiforme lateralis". In that case it's "laterale". But in ...
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1answer
7k views

Coracoid vs. Coronoid - Etymology/Naming Choice?

The word coracoid (e.g., coracoid process of scapula) literally means "resembling a crow/raven" or "of the form of a crow/raven." In this case, I assume, resembling the hooked characteristic of a ...
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0answers
101 views

How to contract sternocleidomastoid muscle by thought?

If I do not turn my head, how can I contract ( or tighten) the sternocleidomastoid muscle ( like we can intensely tighten muscle in limbs)?
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4answers
1k views

Why heart beats increase when we are in a state of tension even though it is a disadvantage?

Suppose a poisonous snake bites you; this will likely cause hypertension, and it will result in your heart rate increasing dramatically. Because of the high rate of heart beats, your body will make ...
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1answer
438 views

Why all human beings not black in color?

Archaeologist & Historians strongly claiming Human beings originated from African continent, Where default color is Black for humans. Why all human beings not black in color?
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2answers
11k views

What is the function of epidermal ridges on human fingers (that produce fingerprints)?

What function is served by the epidermal or capillary ridges on human fingers, the supposedly unique impressions of which are known as fingerprints?
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2answers
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Why do doctors use a new thread for each stitch?

Why do doctors use a new thread of the same kind for each stitch instead of using a single thread for the entire stitch?
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2answers
14k views

Why do we have more sweat glands in our palms?

Why is it that we have more sweat glands in areas such as the palms of our hands and the soles of our feet? I just learned that there are more there but I am curious as to why that is.
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1answer
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How can we move our lips even though they don't have any bones? [closed]

How can we move our lips even though they don't have any bones? We can move everything if it is attached to the bones. Example: Legs & Arms. otherwise we can't move it.
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1answer
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Do men with an African ethnic background have larger penises in comparison to men of European ethnic background? If so, why? [closed]

Do men with an African ethnic background have, on average, a larger penis than their European counterparts?
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How nasal hairs filter particles of micron size?

This book says: The larger particles (> 10 μm diameter) are filtered by hair in the nostrils If we see the anatomy of nasal hairs and its density in the nostrils then it seems that its impossible ...
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0answers
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Does human skeletal muscle fascia grow new additional collagen in response to increases in skeletal muscle size?

For example, if a human skeletal muscle is growing repeatedly due to periodic weightlifting, does the fascia eventually respond to the increasing volume by growing more quantities of collagen or other ...
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0answers
212 views

What is the lifespan of a human skeletal muscle cell (such as in the biceps)?

I have read that most human skeletal muscles (such as those in the biceps) cannot multiply after development (except for exceptional situations of severe damage that involve satellite cells) and that ...
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2answers
561 views

Why do hair on head not get pilo-erected?

Whenever we have "goosebumps", there is a momentary piloerection, due to which hair on our elbows and legs get "erected" and "stand" almost perpendicular to the surface of our skin. But why do our "...
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0answers
961 views

Does the humeroradial joint move medially/laterally?

The humeroradial joint is a ball-and-socket joint that, if unrestricted, would allow for movement around all possible axes. However (as succinctly stated from Wikipedia): the annular ligament, by ...
4
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1answer
77 views

Is there a map of the individual motor axons in the limbs?

As of right now, I can only find a map of nerve fibers, but not necessarily the individual neuron axons. For example, here's a map of the nerves in the arm and hand. http://www.innerbody.com/anatomy/...
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0answers
90 views

Changes in spongy urethra during tumescence

How does the columnar cells of spongy urethra expand during tumescence(erection of penis)? If we assume that the urethra has the length, long enough to sustain tumescence without expansion of cells, ...
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2answers
6k views

Using anatomical terms for human organs and parts of plants

I know how to apply anatomical directional terms (e.g., dorsal/ventral, anterior/posterior, etc.) for animals as a whole (bipeds and quadrupeds). Recently, I've been studying plant physiology, and I ...
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0answers
101 views

What makes delayed onset muscle soreness stop occurring?

If someone lifts weights or takes a long jog after not doing it for a while, they can experience delayed onset muscle soreness (DOMS). However, when they return to the same exercise days afterwards, ...
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0answers
95 views

Thyroid transplanted to the abdomen

This question was posed in our endocrinology class, however I have no idea how to answer it: The thyroid gland of a 5-year old boy is transplanted from its normal position in the neck to the abdomen (...
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2answers
998 views

Why metacarpus is considered hand proper?

This textbook states The hand (or manus) consists of the following parts: (a) wrist or carpus, (b) hand proper (or metacarpus), and (c) digits (thumb and fingers). How could I justify why are ...
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0answers
376 views

How can skeletal muscles in the human body be modeled as levers? [closed]

From what I understand, human arms can be thought of as third class levers, so that the distance from your elbow to the place where the muscle attaches is effectively the distance to the fulcrum, so ...
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1answer
81k views

Dorsal vs Posterior and Ventral vs Anterior

From prior reading, I thought that Dorsal is the same as Posterior and Ventral is the same as Anterior. However, when I checked in google images for these anatomical terms for a horse (just to ...
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1answer
84 views

If a fully functional lab grown pancreas can exist, can it be used as a cure for type 2 diabetes?

Is it approximately equivalent to say that if a fully functional lab grown pancreas exists, then a way to cure Type 2 diabetes could soon exist? Recently I've already checked out that only the ...
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2answers
6k views

What is the purpose of the incus?

The three bones in the middle ear -- the malleus, the incus, and the stapes-- play a role in transmitting sound waves to the inner ear (the cochlea). I understand that the malleus is the bone closest ...
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2answers
759 views

Can the human chin have developed to protect against combat strangles?

Has the mechanical explanation of headlock defense ever been discussed by scientists to explain the chin(protuberantia mentalis)? A mechanical advantage that prevents death and being beaten up by ...
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1answer
735 views

Why hand washing causes skin to dry?

This seems counter intuitive: dry hands mean low humidity, so why when humidity is increased, by washing hands, they become even more dry, eventually? In particular, why such hand dryness is usually ...
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1answer
2k views

Common site for atherosclerosis

My book( textbook of anatomy abdomen and lower limb 2nd edition - by vishram Singh pg.no:286) says: Acute arterial occlusion: It is mostly caused by embolism or thrombosis. It usually occurs in the ...
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1answer
1k views

What are some characteristics of venules and arterioles?

I know that the vascular system of the human body is organized in the two, "ever branching", structures of the veins and the arteries. These two structures stem from their connections to the heart and ...
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1answer
115 views

Is it possible to completely puncture a human hand and have no blood come out?

Illusionist David Blaine sometimes performs a trick where he takes a very long and thin ice pick, insterts it in his hand, and comes out the other side (the palm). However, there is no blood present. ...
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2answers
17k views

What's inside the males body in the space where females have the ovaries and the uterus?

The male penis and scrotum are external extremities, whereas the female sex organs are placed "inside" the body. So as females have the bladder, rectum, other stuff just like males. Does this mean ...
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1answer
19k views

Why do we have the tibia and fibula (a 2nd bone) in the lower leg?

Does fibula participate in rotational movement of ankle or not (just like the radius in forearm)? If not, what is the purpose of that bone?
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0answers
163 views

Left Ventricle vs. Right Ventricle size in different Animals [closed]

Why are the right ventricles in chicken hearts significantly smaller than the left ventricles, whereas in cows the two ventricles are of roughly equal size.
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1answer
6k views

Surgical vs anatomical neck

What is the significance of differentiating anatomical neck and surgical neck of a bone? What could be criterias for differentiation? I found an article here that says fractures to surgical neck ...
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0answers
45 views

On Deformation of the body due to dipole orientation in the cells [closed]

Our bodies are made up of billions of atoms and molecules, and each cell has many molecules with dipoles that are initially random and orient themselves in one specific direction when an electric ...
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1answer
464 views

Why does the term “epicondyle” often refer to either of the two at the elbow end of the humerus?

Why does the term "epicondyle" often refer to either of the two at the elbow end of the humerus? Example: I understand that epicondyle means near a condyle, but there are several condyles in the ...
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2answers
3k views

Could a man be proved positive for a pregnancy test?

From the question: Could a man be proved positive for a pregnancy test?. I don't mean if a man could be pregnant but if he runs a pregnancy test, it is possible for it to come out positive?
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1answer
4k views

What is the rest state for eyelids - Open or Closed?

If one were to not apply any efforts on the eyelid muscles, will they remain open or closed? In movies when we see a person die, either case could happen - their eyelids could be open or closed when ...
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1answer
982 views

What is the distance between the insertion of the distal end of the bicep tendon and the head of the radius?

I was unable to find a source that could provide a measurement for the distance between the insertion of the distal end of the bicep tendon and the head of the radius. Does anyone know a source that ...
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1answer
3k views

8 abdominal muscles but 10 pack

Simple question, how is it possible that there are people who appear to have 10 pack abdominal muscles while the human body has only eight?
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1answer
1k views

confusion regarding degrees of flexion and a goniometer

I have read https://en.wikipedia.org/wiki/Anatomical_terms_of_motion#Flexion_and_extension "Flexion ... decreases the angle...Extension is the opposite of flexion, describing a straightening ...
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0answers
39 views

Are the human placenta chorionic villi and villous tree the synonyms?

Are the human placental chorionic villi and the villous tree the synonyms? Or, if not, can I say that these tissues would have practically the same gene expression profile in an RNA microarray ...
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1answer
724 views

Does the anterior primary ramus of T6 innvervate the Rectus abdominis?

Anatomy and Human Movement Structure and Function writes in the section about Rectus abdominis: Nerve supply By the anterior primary rami of the lower six or seven thoracic nerves (T6/7 to T12)....
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5answers
42k 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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0answers
45 views

How deep does a 0.5mm radius drill need to drill before it start to hurt the brain assuming the drill bit will be pull off without wiggle?

How deep does a 0.5mm radius drill into the brain need to drill before it start to hurt the brain permanently assuming the drill bit will be pull off without wiggle? I am assessing how fragile of a ...
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1answer
79 views

How correlated are the lengths of tendons in different part of a human body?

How correlated are the lengths of tendons in different part of a human body? E.g., if the we consider two humans, A, and B. Human A has a patellar tendon of length 2 cm, and human B has a patellar ...
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0answers
353 views

Anatomical Angle Made by the Fingers of an Extended Palm

Does the angle made by the fingers (excluding the thumb) of an extended palm (as shown in the figure below) have a name (such as the Lovibond or Cobb angle, for instance) ? I have already checked ...

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