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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5
votes
2answers
7k views

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

Are tendons and ligaments classified under the muscular system or the bone system? Basically they are not bones or muscles and that's why I have doubt.
2
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0answers
287 views

Why does the clavicle ossify intramembraneously?

The clavicle is the only long bone which ossifies as a membrane bone. I studied this process, but I can't find the reason why it features intramembraneous ossification?
1
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0answers
649 views

Do all body organs grow in proportion during the period of physical development?

It is obvious that during childhood and puberty, the human body grows uniformly or proportionally so that a child's arm length, for example, is shorter than an adult's arm length but is proportional ...
1
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0answers
263 views

Does the vagus nerve supply the human thoracic diaphragm?

The vagus nerve (CN X) passes through the oesophageal hiatus of the diaphragm at the vertebral level T10. But does the vagus nerve actually offer any nerve supply to the diaphragm?
7
votes
2answers
13k views

Why does the ring finger not move independently?

Why is it that we need to move little finger in order to move ring finger with it? For example, put your palm on a table and fold your middle finger inside. You won't be able to move your ring finger ...
8
votes
1answer
354 views

Why the smell of sweat greatly varies across the body?

Having only two types of sweat glands (eccrine, apocrine) I would expect the sweat odor "spectrum" to be very "narrow". However, the smell of sweat greatly varies between scalp, arms, armpits, groin ...
6
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2answers
129 views

Comprehensive biology or anatomy wordbank

I teach A&P for bio non majors. I have a special needs student whose accommodation requires a word bank for any anatomy identification questions I have on the exam. I would like to present the ...
2
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0answers
84 views

Limit of muscle atrophy [closed]

I read that lack of action leads to muscle atrophy , I experienced same when I had a cast for hand fracture. So how far this atrophy go, who decides minimum size of muscle due to lack of activity, for ...
9
votes
1answer
901 views

Can skeletal morphology change in adults?

I'm just a curious layman, so be gentle. I read around that things like the cranial1 and pelvic2 morphology change with age, but I also read seemingly contradictory information that bones are '...
3
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1answer
174 views

Can exercise strengthen tendons and ligaments?

Is is possible to strengthen tendons using exercise to prevent injury, for example preventing shoulder dislocation?
2
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2answers
298 views

Did the capacity to be “knocked out” arise because it conferred an evolutionary advantage?

From first principles, it seems surprising that a blow to the head would cause unconsciousness rather than just impaired function. I've heard a lot of analogies to computers -- "Your brain has to ...
1
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2answers
416 views

What is a concussion?

When I was a kid and someone got a concussion, I seem to remember people telling me that it was when your brain impacts the side of your skull, accelerating fast enough to do so despite the ...
2
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1answer
320 views

growth limit on muscle

Is there any biological limit on muscle growth in human body, one can keep pushing body and keep growing more and more muscle but somewhere it must become diffcult for body to sustain those cells ...
0
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0answers
88 views

Mental Symphysis

Why dow we consider mandibular symphysis(symphysis menti) as type of Amphiarthrosis that too of symphysis variety, eventhough it lacks movement and cartilage at joint? Why don't we consider as ...
0
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1answer
45 views

Arteries used for inserting catheter

For catheter purpose, femoral and subclavian arteries are mostly used as starting point. Why? Are there other arteries which are used for the purpose?
0
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1answer
2k views

What is the name for the opening in the mouth for the nasal passages?

Is there a proper anatomical name for the opening in the soft palette where the nasal passages enter the mouth?
5
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0answers
76 views

Do cells in healing ligaments or tendons have deformation processes? If so, what are they?

I am trying to better understand how non-muscle tissue in the muscuoloskeletal system heals. Specifically, I am interested in how ligaments or tendons heal once torn. I read the following text: ...
1
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1answer
2k views

Do Japanese have a different pelvis position than Europeans?

I was watching a show that made the claim that European women's pelvis is tilted more forward compared to Japanese women's which places their butts higher up. Is this information accurate?
1
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0answers
53 views

Bone fracture cause [closed]

I had bone fracture twice in the same arm. So I had first bone fracture in right forearm with 45 degree break on two bones, after 3 months of that fracture while I was climbing a slope I fell and I ...
4
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0answers
718 views

Why are sutural bones more common in lambdoid suture? [closed]

Why are sutural bones (Wormian bones) are more commonly present at lambdoid suture? Is the tortuous nature of lambdoid suture a reason for that? Evidences for my claim: They(sutural bones) occur ...
2
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1answer
1k views

Ear ossicles a part of Skull?

Is there anything special about not considering ear ossicles as a part of skull? I could not understand the reasoning behind such classification.
4
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0answers
954 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 ...
2
votes
1answer
195 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 ...
1
vote
1answer
90 views

What makes a rotator cuff tear symptomatic in humans?

The majority of rotator cuff tears is asymptomatic {1}. What makes a rotator cuff tear symptomatic or asymptomatic in humans? References: {1} Minagawa, Hiroshi, Nobuyuki Yamamoto, Hidekazu Abe, ...
2
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0answers
666 views

Are differing shapes of the acromion congenital or acquired?

In the human body, the acromion is located here: There exist different shapes of acromion, at least 3: The frequency varies according to the acromion type: Some clinicians consider that there exist ...
1
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0answers
268 views

Significance of lip end curve

What is significance of curve at point where lips meet, how it is determined and what effects it has on attraction and other factors? For some people it is a downward curve, for others it's an upward ...
2
votes
1answer
284 views

What is the course of inter auricular line?

BACKGROUND: The interauricular line is the line connecting two auricles. I wish to know the exact route through which this line passes. I want to be sure whether it passes through the parietal ...
1
vote
2answers
723 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. ...
3
votes
1answer
335 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?
4
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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?
6
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1answer
107 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 ...
4
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1answer
6k 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 ...
2
votes
0answers
97 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)?
0
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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 ...
2
votes
1answer
394 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?
46
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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?
5
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2answers
161 views

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?
8
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2answers
13k 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.
1
vote
1answer
1k views

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.
-2
votes
1answer
2k views

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?
1
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0answers
827 views

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 ...
2
votes
0answers
39 views

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 ...
1
vote
0answers
205 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 ...
3
votes
1answer
466 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 "...
2
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0answers
784 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
votes
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/...
3
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0answers
87 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, ...
13
votes
2answers
5k 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 ...
1
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0answers
92 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, ...
1
vote
0answers
67 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 ...