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The first vertebrates (as far as is known) were a group of extinct*, jawless, heavily-armored fishes called Ostracaderms. *There are a few zoologists who feel that the hagfish and possibly the lamprey and slime hag are ostracaderms, but I disagree. I'm not at all sure that the hagfish and slime hag are true vertebrates.
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∙ 15y ago
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The first cervical vertebra is called the axis?
Yes it is called the atlas
Dens here provides a pivot for rotation of the first cervical vertebra?
Atlaswrong . the correct answer is axis (http://en.wikipedia.org/wiki/Axis_(anatomy)) "It forms the pivot upon which the first cervical vertebra (the atlas), which carries the head, rotates."
What is another name for the C1 vertebra?
The first Cervicalvertebrae..............Neck...........................Altis
The transverse processes of the first cervical vertebra are also known as the?
Ventral Arches
What is an example of a pivotal joint?
The very best example of a pivot joint is the axis and atlas in the spinal column. This involves the very first two vertebra which allow you to turn your head from side to side.
Is spirostomum animal-like?
No, the spirostomum is a unicelluar organism so it has no vertebra.
Is the atlas classified as a cervical vertebra?
Yes the atlas is the first cervical vertebra known as C1.
Which cranial bone houses the condyles that articulate with first cervical vertebra?
The occipital condyles of the occipital bones articulate with the first cervical vertebra.
What is the dens odontoid process?
Since the dens is part of the Axis vertebra (and project up in the first vertebra, the Atlas vertebra that supports the skull) it is called the Dens Axis
Which vertebra articulates with the occipital bone?
The first cervical vertebra, called C1 or the atlas, articulates with the occipital bone.
Head moved side to side first vertebra pivots around?
around the dens of the second vertebra. Is that is the full question?
When the head is moved from side to side the first vertebra pivots around the what of the second vertebra?
densThe Dens of the second Vertebrae.
The first cervical vertebra is called the axis?
Yes it is called the atlas
The occipital articulates with the first vertebra at what location?
condyles
What location have pivotal joint?
The skull to the first vertebra
What class lever is a skull pivoting on a vertebra?
first
What location have a pivotal joint?
The skull to the first vertebra
