And what are the three kinds of joints?
2007-03-28 15:42:07 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Biology
A baby's body has about 300 bones at birth. These eventually fuse (grow together) to form the 206 bones that adults have. This makes vaginal birth possible because if all the bones were fused and solid (many start out as just cartilage and later turn to bone) it would too traumatic to squeeze out the birth canal. The skull is the most noticeable example of this. That is why most VB babies have "cone heads."
synarthroses-not movable such as in the skull, amphiarthroses- slightly movable like ribs, diarthrosis- movable ones such as ball and socket. here's more info on joints http://www.mnsu.edu/emuseum/biology/humananatomy/skeletal/joints.html
2007-03-28 15:56:48 · answer #1 · answered by pebble 6 · 1⤊ 1⤋
that's actually an interesting question.. in some places they have more bones, like in the tail bone, adults bones have fused together while a baby has the actual bones to make up the tail bone but they have not fused to make one bone.. in the nose adults have bones, babies do not grow bones in the nose until around the age of 2.
2016-03-22 13:13:17 · answer #2 · answered by ? 4 · 0⤊ 0⤋
when the baby or infant has almost 300 bones. but if or when the baby or infant turns into a full age 18 or 20 the bones are connected
2014-03-12 16:01:46 · answer #3 · answered by Renee Patterson 1 · 0⤊ 0⤋
RE:
Why do infants have more bones than adults?
And what are the three kinds of joints?
2015-08-02 01:39:23 · answer #4 · answered by Anonymous · 0⤊ 0⤋
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More, I thought. Several bones of the skull are distinct structures that eventually fuse together, but are separate pieces at birth. It makes the birthing process easier, I've heard.
2016-04-03 23:22:07 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Babies have more bones because they're bones haven't fused to together like ours have.
2007-03-28 15:45:54 · answer #6 · answered by Misty Eyes 6 · 0⤊ 0⤋
Because over time, the bones of a baby fuse together.
2007-03-28 15:47:22 · answer #7 · answered by suigeneris-impetus 6 · 0⤊ 1⤋
bones fuse together (sacrum and cranium for example) as we grow older.
ball & socket, hinge and ??
the other one has to be like vertebrae or wrists
2007-03-28 15:46:30 · answer #8 · answered by BonesofaTeacher 7 · 0⤊ 0⤋
Makes it easier for them to pass through the birth canal.
2007-03-28 15:47:29 · answer #9 · answered by Anonymous · 2⤊ 1⤋
Yes. and I don't know the answer to the second.
2 points!
2007-03-28 15:51:35 · answer #10 · answered by If your a bird, I'm a bird.. 5 · 1⤊ 0⤋