irregular bone
The axis, or second cervical vertebra (C2), articulates with two bones: the atlas (C1), which is the first cervical vertebra, and the occipital bone of the skull. The joint between the atlas and axis allows for the rotation of the head, while the connection with the occipital bone facilitates nodding movements.
The axis powers were fascist.
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Fourfold rotational. In chemistry, it would be called a C4 axis.
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A transverse fracture, where the bone breaks in a straight line perpendicular to its long axis, is likely to result from a major blow. This type of fracture is often seen in situations of high impact trauma.
No, the axis is located in the neck.
transverse fracture
The longitudinal axis of a bone is an imaginary line that runs along the length of the bone from one end to the other. It helps to define the orientation and direction of forces acting on the bone, such as during movement or weight-bearing activities. Understanding the longitudinal axis is important in biomechanics and in the study of bone structure and function.
rotation!
Rotation
Axis
The humerus is a bone in the upper arm that has a long longitudinal axis with expanded ends where it articulates with the scapula at the shoulder joint and the radius and ulna at the elbow joint.
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Rotation is the movement around a longitudinal axis.
The type of joint that allows the rounded end of one bone to fit into a ring of bone for rotational movement is called a pivot joint. An example of this is the joint between the first and second cervical vertebrae (the atlas and axis), which enables the head to turn from side to side. Pivot joints facilitate rotational motion while allowing for limited movement in other directions.
The atlas, also known as C1 sits on the axis, or C2. The dens of the axis projects through the vertebral foramen of the atlas and the vertebral facets come in contact with each other through cartilaginous discs between the two vertebrae.