249
edits
Changes
Jump to navigation
Jump to search
Quadrupedal Mechanics - Anatomy & Physiology (view source)
Revision as of 00:14, 20 June 2013
, 00:14, 20 June 2013→Sculpture within bones
==='''Sculpture within bones'''===
==='''Sculpture within bones'''===
[[File:Fig 3.2.png|thumb|'''Fig. 3.2 Trabecular compression lines in bone''']]
The combination of lightness and compression strength is obtained by internal sculpturing. Trabeculae (Latin, little beams) are oriented parallel to the compression forces. These forces act, for instance, between opposing ends of the bodies of vertebrae, & therefore the trabeculae are parallel to the axis of each vertebral body (Fig. 3.2). At the end of a long bone, the compress-ion force transmitted across a flexed joint is not parallel to the shaft, and will vary in direction. Here, the design most economical of material is a network of interconnecting trabeculae following the compression stress lines (Fig. 2.8). Study the pattern in a long bone that has been sectioned longitudinally.
The combination of lightness and compression strength is obtained by internal sculpturing. Trabeculae (Latin, little beams) are oriented parallel to the compression forces. These forces act, for instance, between opposing ends of the bodies of vertebrae, & therefore the trabeculae are parallel to the axis of each vertebral body (Fig. 3.2). At the end of a long bone, the compress-ion force transmitted across a flexed joint is not parallel to the shaft, and will vary in direction. Here, the design most economical of material is a network of interconnecting trabeculae following the compression stress lines (Fig. 2.8). Study the pattern in a long bone that has been sectioned longitudinally.
:::::'''Fig.3.2 Trabecular compression lines in bone'''
:::::'''Fig.3.2 Trabecular compression lines in bone'''
:::::A median section of the 10th thoracic vertebra of the horse, showing trabeculae within the vertebral body directed along the long axis of the body.
:::::A median section of the 10th thoracic vertebra of the horse, showing trabeculae within the vertebral body directed along the long axis of the body.
==='''Design to resist bending in one plane'''===
==='''Design to resist bending in one plane'''===