Archive image from page 122 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( Spinous process attached, whilst others are articular and assist in uniting the different vertebras together by means of a series of movable joints. The roots of the vertebral arches ( pedicles) are the bars of bone which pass from the dorsum of the body of the vertebrae on either side to the points where the articular pro- cesses are united to the arch. These roots are compressed laterally, and have rounded superior and inferior borders. Since the
Archive image from page 122 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( Spinous process attached, whilst others are articular and assist in uniting the different vertebras together by means of a series of movable joints. The roots of the vertebral arches ( pedicles) are the bars of bone which pass from the dorsum of the body of the vertebrae on either side to the points where the articular pro- cesses are united to the arch. These roots are compressed laterally, and have rounded superior and inferior borders. Since the vertical breadth of the roots is not as great as the thickness of the body to which they are attached, it follows that when the vertebrae are placed one above the other a series of intervals is left between the roots of the vertebral arches of the different vertebrae. These spaces, enclosed anteriorly by the bodies of the verte- brae and their intervertebral fibro- cartilages and posteriorly by the coaptation of the articular processes, form a series of holes communicat- ing with the vertebral canal; these are called the intervertebral foramina, and allow the transmission of spinal nerves and vessels. As each inter- vertebral foramen is bounded above and below by one of the roots of the vertebral arch, the grooved surfaces in correspondence with the upper and lower borders of the roots are called the incisurae vertebrales superior et inferior (upper and lower intervertebral notches). Posteriorly, the two roots of the vertebral arch are united by two somewhat flattened plates of bone—the laminae, which converge towards the median plane, and become fused with the root of the projecting spinous process. The breadth of the laminae and their sloping arrangement are such, that, when the vertebrae are articulated together, they leave little space between them, thus enclosing fairly completely the vertebral canal, of which they form the posterior wall. The edges and inner surfaces o
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