. Cunningham's Text-book of anatomy. Anatomy. 102 > â £ ^ u level of the third sacral segment is reached, at which point the transverse diameter is somewhat abruptly diminished, a reduction in width which is further suddenly- accentuated opposite the fifth sacral segment. As viewed from the side, the bodies display a gradual increase in their antero-posterior width until the second lumbar vertebra is reached, below which, this diameter is slightly reduced. In the sacral region the reduction in this diameter is great in the first and second sacral segments, more gradual and less
. Cunningham's Text-book of anatomy. Anatomy. 102 > â £ ^ u level of the third sacral segment is reached, at which point the transverse diameter is somewhat abruptly diminished, a reduction in width which is further suddenly- accentuated opposite the fifth sacral segment. As viewed from the side, the bodies display a gradual increase in their antero-posterior width until the second lumbar vertebra is reached, below which, this diameter is slightly reduced. In the sacral region the reduction in this diameter is great in the first and second sacral segments, more gradual and less marked in the last three segments. The facets for the heads of the ribs in the upper thoracic region he on the sides of the bodies; those for the tenth, eleventh, and twelfth are placed farther back on the roots of the vertebral arches. The intervertebral foramina increase in size from above downwards in the movable part of the column, being largest â¢in the lumbar region. In the sacral region they decrease in size from above downwards. In the cervical region the two highest cervical nerves pass out behind the articular processes of the atlas and epistropheus, and lie, therefore, behind the corresponding transverse processes of these vertebrae. The succeeding cervical nerves pass out through the intervertebral foramina, which are placed between the transverse processes and anterior to the articular processes. In the thoracic and lumbar vertebrae the intervertebral foramina lie anterior to both the articular and transverse processes. The arrangement of these foramina in the sacrum has been already sufficiently explained. The vertebral canal for the lodgment of the spinal medulla and its meninges is largest in the cervical and lumbar regions, in both of which it assumes a triangular form; whilst it is narrow and circular in the thoracic region. These facts are correlated with the movements of the column which are most free in those regions where the canal is largest, t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
