A course of instruction in zootomy (vertebrata) / by T. Jeffrey Parker.

  • Thomas Jeffery Parker
Date:
1893
Catalogue details

Licence: Public Domain Mark

Credit: A course of instruction in zootomy (vertebrata) / by T. Jeffrey Parker. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    pre-axial border of the humerus is external, and in the fore- arm, the distal end is rotated in such a way that while the pre-axial border looks forwards and outwards at the proximal end of the fore-arm, it looks directly inwards at its distal end : the manus, being rotated with the fore-arm, has its pre-axial border inwards. 92. The humerus, an elongated bone, consisting of a shaft of true bone and of proximal and distal extremities or epiphyses of calcified cartilage. Its proximal end or head is rounded, and articulates with the glenoid cavity : on the pre-axial or radial border the shaft is produced into a large process, the radial tuberosity, on its post-axial or ulnar border into a smaller ulnar tuberosity, the latter being partly formed by the proximal epiphysis. At the distal end of the humerus is the pulley-like trochlea, divided into a smaller radial and a larger ulnar articular surface: the distal end of the shaft has its pre-axial border produced into the external or radial condyle, its post-axial border into the internal or ulnar condyle, both processes im- mediately proximal to the trochlea. 93. The radius, a slender bone consisting of an ossified shaft and of two calcified epiphyses : the proximal end or head is disc-shaped and slightly excavated for articulation with the humerus, the distal extremity is wide from side to side, concave for articulation with the carpus, and produced pre-axially into the radial styloid process. 94. The ulna, also formed of shaft and epiphyses; its proximal end is produced into a blunt upwardly-directed process, the olecranon, which, along with the actual ])roximal end of the bone, furnishes the concave sigmoid cavity, or articular surface working over the trochlea of the humerus. The distal end of the ulna is convex and articulates with the carpus.
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