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i agree. there were some that they tested us on, but we just happened to not have them in our diagrams. it was a good thing my partner knew some of them.

Do the bones of the face (zygomatics, etc.) count as part of the skull and will they be in the regional and state competitions?

94 wrote:Do the bones of the face (zygomatics, etc.) count as part of the skull and will they be in the regional and state competitions?

Yes they do but you don't have to know them unless you go to Nationals.

I don't think so because that for nationals only. sometimes we study the national stuff just in case the test-makers are unfair though.

Also, is osteoprogenitor cell just another name for an ostegenic cell?
i think it is cuz they seem like they do the same things, but can anyone confirm this? gracias~

I think osteogenic cells are like osteoblasts and osteoprogenitor cells are like pre osteoblast.

here's what i got:

osteogenic cells - respond to traumas, such as fractures, by giving rise to bone-forming cells and bone-destroying cells
(source - training handout for anatomy from 2009)

osteoprogenitor cells - have no special function, can undergo mitosis, can change into osteoblasts,
occur in inner lining of periosteum, endosteum, and some canals. (source: i forget where it's from; i found it in my notes)

Here is my new theory: Osteoprogenitor cells differentiate into osteoblasts, which in turn form either bone lining cells or osteocytes. White blood cells produce osteoclasts which destroy the osteocytes and then commit suicide (apoptosis). The process begins over again because osteoprogenitor cells and white blood cells can undergo mitosis. Meanwhile, osteogenic cells only help out when there are emergencies (traumas, fractures) by producing more bone-forming and bone-destroying cells.

I think this makes more sense than scientists just using two names for one kind of cell. Is this right?
sorry that i double-posted & i'm annoying. I'm not going to be able to sleep unless i figure this out. -_-'

Well in my Anatomy book it says that there is an Osteogenic zone in the periosteum, and Osteogenic cells are found in the periosteum so this makes sense. And this stuff about Osteogenic zone is in the Bone growth section, idk if this is of any significance.. But in the Fracture section it doesn't specify Osteogenic cells, only osteoblasts.

I looked up Osteoprogenitor cells and this is what it said "A mesenchymal cell that differentiates into an osteoblast."

Mesenchyme- Embryonic tissue that forms connective tissue, blood, and smooth muscles. (Barron's Medical Guide)


So I believe that Osteoprogenitor cells arise as an Embryo, as a result of cells that are just sort of waiting to find out what their purpose is going to be, in this case Osteoblasts. Also I think that Osteoprogenitor cells are present in the Epiphyseal plate, because we know that this is the growth zone, and they undergo mitosis (textbook says so).

Osteogenic cells, once bones are formed, are in the Osteogenic zone of the periosteum. When Osteoblasts are needed, i.e. growth, they become Osteoblasts.

So I guess Osteoprogenitor cells differentiate into Osteoblasts as a result of Cartilage in the Epiphyseal plate undergoing growth. And the Osteoblasts that result are termed Osteogenic cells.


I'm confused.

Uhh, okay. From what I have in my anatomy book:

Osteogenic cells are progenitor cells that give rise to all bone cells.
Osteoblasts are the principal bone-building cells; they synthesize collagenous fibers and bone matrix, and promote mineralization during ossification. Once this has been accomplished, the osteoblasts, which are trapped in their own matrix, develop into osteocytes that maintain the bone tissue.
Osteoclasts contain lysosomes ahd phagocytic vacuoles. These bone- destroying cells demineralize bone tissue.

SOOOO, to answer the original question: is osteoprogenitor cell another name for osteogenic cell? the answer is: yes, in my opinion because of the function of the osteogenic cell.

I hope this maybe clears things up!

lol ok I believe you