An overall feeling of the shape of the thing.
Is it tall and narrow?
Short and broad?
Men will usually have a taller pelvis,
while women will have a shorter one.
Look at the iliac blades. Do they form a bowl, or do they flare out to the sides a little bit?
A female pelvis will be more bowl-like. The pelvic inlet in a female will be larger than in a male in relation to overall size of the pelvis,
and the Sacrum will be wider and shorter as well.
Take a peek at the sciatic notch.
A good way to gauge the size of the notch is to stick your fingers in and see how many will fit (Taking into account that everyone has different hand size!).
I can usually fit one of my short, stout little thumbs into a males sciatic notch, but I can usually get at least my first and second fingers into a females.
A wider sciatic notch is consistent with females having wider, bowl-shaped pelves.
Flexion of this notch coincides with a basin-shaped pelvis.
lets take a look at the pubic area.
In females, this region is longer/wider than in males.
In relation to fossil hominids, it looks like this is the part of the pelvis that has expanded to allow for the birth of bigger-headed babies, so it makes sense that this would be larger in females than in males.
Look at the area under the pubic symphesis, called the subpubic angle.
In males, this angle will be more acute than in females, where it will be fairly obtuse.
Again, this is to lengthen the pubic region and make room for baby.
Next, its time to look at some details.
We can use Phenices method to look at the shape of the pubic area.
Look at the bar of bone extending from the pubic symphesis.
This bar is called the ischiopubic ramus because it connects the ischium with the pubis.
In males, it is relatively uniform in thickness and shape as it extends down.
In females, it is very narrow right underneath the symphesis and thickens out toward the bottom.
Phenice termed this quality a subpubic concavity, and it is one of the most accurate ways to sex a pelvis.
Where the ramus is thinnest in females, it is also quite sharp on the medial aspect, whereas it is more rounded in males.
Sexing a pelvis is one of those things that takes practice. In fact, thats one of the problems with it. There are very few things in a pelvis where you can just look at it and say, thats a male without having a good deal of experience. You may think a sciatic notch looks particularly narrow until you see some guy with a REALLY narrow sciatic notch, and then you think, hmmm, maybe that other one was a female Or, you might take the rule of thumb from above too much to heart and sex everything as female because your fingers are more gracile than mine! The pelvis is one of the most reliable bones to look at to determine sex, but it certainly isnt foolproof. These are some of the tools I use, but they must all be used together before you can decide that a pelvis is consistent with the designation of male or female.
Perhaps the best advice I can offer is that if you dont already have it, you need The Human Bone Manual, the best field manual on the market
24-06-2010 om 20:39
geschreven door tsjok45