Questions tagged [bone-biology]

Study of the structural component of the vertebrate skeleton. Bone is a dense connective tissue composed of various cell types as well as collagen and mineralized calcium.

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52
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3answers
4k views

Why does cracking a joint make noise?

What causes the noise when you crack a joint? Is joint cracking harmful?
15
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1answer
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Can you bleed from your bones?

I was talking to my science teacher about the body specifically the red bone marrow. She said that blood is created in the red bone marrow. Does that mean that if you were to cut a fresh bone open ...
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1answer
132 views

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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2answers
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Human spine: Is the coccyx really fused?

Prologue: This post is about the adult (say, a 20 year old) human skeleton; I'm not particularly interested in infant skeletons. The human spine has is composed of cervical, thoracic, lumbar, sacral ...
9
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1answer
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What is head of a bone?

For most of the long bones head is the proximal end, but for metacarpals and Ulna, head is the distal end. Why are their distal ends called as heads? What's the criteria for calling an end as head ...
9
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1answer
743 views

How are bones growing, if bones are not connected to the brain?

If the bones are not connected to the brain, how is their growth controlled? This question is not a duplicate of the question Mechanisms of bone growth, as this question deals with how bone growth is ...
9
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1answer
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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 '...
8
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1answer
2k views

What happens to bones that do not heal?

I would like to know the steps the body takes to heal a broken bone and what happens if it cannot heal properly. I am not looking for advice or explanations on resting and not doing activity, I am ...
7
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1answer
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Cat purring: What are some possible underlying mechanisms behind purring and bone remodeling and formation?

http://www.scientificamerican.com/article.cfm?id=why-do-cats-purr The article above says that cats purr mostly when they're wounded or under duress. They hypothesis that cats purring leads to ...
6
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1answer
311 views

Identify these hinged barbed bones

My daughter Stella and I found these bones on the shore of Port Phillip Bay, Victoria, Australia. The smaller, barbed bone is attached by a hinged joint that allows it to move through just over 90 ...
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1answer
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Identifying a lone bone found newar Rowena Crest, Oregon (USA)

I was wondering whether anyone knows how to identify what animal the following bone belongs to. I assume it a femur, but it seems rather short and squat. The following photos show two views of this ...
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1answer
631 views

Stretching and compressing bones

The Young's modulus of elasticity when a bone is stretched is : 16×109 and when it is compressed, it is 9×109 N/m2. That means, change in length will be more if you compress a bone as compared to ...
5
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1answer
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Braquio-abduction illusion explanation and references

Illusion: Lying down on a hard flat floor move arms up and down (as when doing a snow angel) while keeping them touching the floor. While repeating it a few times the floor begins to appear concave, ...
5
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1answer
337 views

Identify a lone bone (jaw including teeth) found on a beach at Trouville-sur-Mer (France) in 2018

Found this on the beach at Trouville-sur-Mer in France, on 11 May 2018. It was laying in the sand, close to a trash can. Considering the strong smell of sand within the skeleton, it must have been ...
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292 views

This is the bone of which animal? And which bone?

so this bone was found on a construction site in Paris and I was wondering from which animal does it come from?
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3answers
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Do skull bones have pain nerves (nociceptors)?

I recently attended an awake brain surgery for deep brain stimulation and it seemed to me that only the skin surrounding the drilled hole got local anaesthesia. I know that the brain itself does not ...
4
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1answer
237 views

Mechanisms of bone growth

The length of a bone is caused by growth of hyaline cartilage which is then replaced by bone tissue. How do cells know whether they should grow the hyaline cartilage? What are the key molecules that ...
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0answers
729 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 ...
3
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3answers
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At what temperature do human bones disintegrate?

I know, the human skin can get damaged as quickly as 2 seconds, when exposed to temperature above 80 Celsius. However, what about human bones, say the skull? For example, when you cook a meal, at ...
3
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1answer
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Human bone density and Brown Bear bone density?

It is stated on this website that the density of a Grizzly bear bone is ten times our own. And since I am not into biology at all, I am confused as I don't understand the meaning of bone density here. ...
3
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1answer
88 views

How does coffee cause calcium loss in our body?

Recently on radio a doctor advices to reduce the consumption of coffee as it leads to calcium loss(as my mother described). My initial response was: How could such thing be possible? What kind of ...
3
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1answer
987 views

What purpose do the opening(s) serve in diapsid and synapsid skulls?

Did synapsid skulls evolve from diapsid skulls or vice versa? Aditionally, do birds have diapsid skulls? The research I have done has yielded some mixed results.
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1answer
486 views

Mean and standard deviation of human bone density?

Are the human bones about equal in density? Or is there any published data on the mean + s.d. density for a given bone available?
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2answers
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Can a broken thumb/finger bone not require realignment of the bone?

Is it possible that a finger/thumb bone fracture is so superficial, that the doctor does not need to realign (re-set) the bone before applying the cast? Or does it always require for even a finger/...
3
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1answer
90 views

What animal is this bone from?

10.5 ounces, found laying on ground, central California coast.
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0answers
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Difference in callus formation during healing of bones of different origin

My study material from pathology states that during fracture healing after hemorrhage and coagulum formation the mesenchymal progenital cells from periostium that are closer to the fracture ...
3
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1answer
290 views

How do marine mammals and penguins maintain bone density?

After much searching on Google with no results, I decided to ask my question here. If I'm not mistaken, swimmers' bone density is less than normal; at least for lifetime swimmers. Astronauts also ...
3
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1answer
515 views

Why were dinosaur skeletons so light compared to mammal skeletons?

I was watching a presentation by Dr. Jessica Theodor [1] who discusses (at 38:10), among other things, the skeletal structure of dinosaurs vs. mammals. "Dinosaurs have way lighter skeletons, which ...
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2answers
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Organ and Bone Marrow Transplantation?

In organ transplantation the transplant is rejected by the body's immune system , but is it possible if along with organ transplant if bone marrow transplantation is carried out from the same donor , ...
2
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1answer
185 views

Do Osteichthyes fishes have any cartilage?

Higher vertebrates, such as mammals, birds, reptiles and amphibians have both bone and cartilage. But do Osteichthyes fish (Bony fish) have any cartilage? Or do they only have bones? I've searched ...
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1answer
710 views

How does cartilage become bone? [closed]

It's a famous fact that bones begin as cartilage and later become bone, but I never was clear how exactly this changeover occurs. Could someone please explain this to me?
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1answer
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How large is the variability in human bone thickness, and is "big boned" a real thing or not?

My girlfriend is arguing that there are "big boned" people, I read some articles that there is no such thing but she still didn't believe in me because she saw some articles too that big boned people ...
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1answer
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Why do our epiphyseal plates close up in our late teens or early twenties?

What causes our epiphyseal plates close up in our late teens or early twenties? I realize that one's genetics plays the main role in this. I assume there is a gene that controls the epiphyseal plates ...
2
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1answer
371 views

How do processes of one osteocyte establish contact with processes of the adjacent cells within the mineralized matrix?

Are the processes and canaliculi formed and contacts established after the osteocytes are embeded in the matrix or are they formed during the embedding process itself. Is there any evidence to suggest ...
2
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1answer
207 views

Might new bones evolve from soft tissue? [closed]

I wonder how bones evolve where there are none. (This is the question, read the sub-questions as examples :) ) Lets take an elephant as an example. If it was adaptive for the elephant, could bones ...
2
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1answer
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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?
2
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1answer
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I need some forearm bone motion pictures

I would like to know how my forearm bones move inside my forearm when I'm twisting my hand. (Also, it would help to see the hand bones action too). "twisting hand" means to me the motion in which the ...
2
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0answers
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Is there a difference in flying technique or anatomy between birds and bats which means bats don't need a large sternum?

I know that birds have a large sternum in order to anchor the wing muscles. Bats also have wings, but don't have the same large sternum. Is there a difference in either flying technique or anatomy ...
2
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2answers
80 views

Is it impossible to increase skeletal bone mass, as opposed to just bone density? [closed]

I've heard exercise and resistance/strength training increases the density, but doesn't increase mass. So basically, experimentally or theoretically possible at least, can modern science do this/is it ...
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0answers
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Exhaustion of skeletal muscle and ligaments

I read somewhere that while doing lifting back should be straight(means normal curve), so that erectors muscle in back do the work but it gets tired easily. Hence we form curve on our back like when ...
2
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0answers
315 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?
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0answers
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Stable isotope sample preparation: Bone Collagen

I am performing research in which I need to extract bone collagen from the foot bones of American Beaver (Castor canadensis). I have read through the literature fairly thoroughly on both the ...
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0answers
166 views

Questions regarding Scapulohumeral Rhythm

I'm actually an artist, but I wanted to ask this because it will help a lot in my figure drawings. My artistic anatomy teacher taught me about the Scapulohumeral Rhythm. He said that in during the ...
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2answers
132 views

What is this fossilized claw found in a Belgian forest?

What is this fossilized claw found in a Belgian forest? It is 14.5 cm long and 2.5 cm in diameter.
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2answers
932 views

At what age does the mouse skull stop growing?

Unless otherwise mandated, neuroscientific research on mice is done with ~7-week old animals. There is a sort-of mantra that at this age their skulls stop growing. However, recently, I noticed a ...
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1answer
123 views

Bolyerine Snakes maxillary bone, split?

How is the maxillary bone split in the Bolyerine Snakes described in T.H Frazzetta's "From Hopeful Monsters to Bolyerine Snakes?" In T. H. Frazzetta, "From Hopeful Monsters to Bolyerine Snakes?" He ...
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1answer
237 views

What Causes Shin Splints? [closed]

My shin splints are clearly tied to running. Though the pain level doesn't seem to correlate to my running intensity. So what is it about running that causes shin splints? My real hope is that if I ...
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1answer
77 views

Are there any proven ways to increase the rate of bone remodeling in humans?

I'm not asking for anything specific -- just wondering if there's any data, studies, or etc. that show a possibility in increased bone resorption and turnover (bone remodeling/Wolff's Law) from ...
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1answer
479 views

How does bone marrow acts like a valve?

Wikipedia says: Furthermore, bone marrow performs a valve-like function to prevent the backflow of lymphatic fluid in the lymphatic system. How can bone marrow act like a valve eventhough they ...
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1answer
306 views

Can magnetoreception occur in humans?

Magnetoreception is a sense which allows an animal to detect the Earth’s magnetic field in order to perceive direction, altitude, or location. Magnetoreception is present in bacteria, arthropods, ...