. Elementary anatomy and physiology : for colleges, academies, and other schools . as if they constituted a pivot; Fig. *5- an instance of which is seen in the turning of a screw, or in the unlocking of a door. Of these two bones the Ulna arti- culates with the humerus, form- ing only a ligamentous union with the bones of the wrist. It is prismoid in form, and is of a hooked shape at its up- per extremity, so that it makes the union between it- self and the humerus a very secure one. The word ulna is a Latin term signifying an ell, because the forearm in early times was used for that measure.
. Elementary anatomy and physiology : for colleges, academies, and other schools . as if they constituted a pivot; Fig. *5- an instance of which is seen in the turning of a screw, or in the unlocking of a door. Of these two bones the Ulna arti- culates with the humerus, form- ing only a ligamentous union with the bones of the wrist. It is prismoid in form, and is of a hooked shape at its up- per extremity, so that it makes the union between it- self and the humerus a very secure one. The word ulna is a Latin term signifying an ell, because the forearm in early times was used for that measure. 133. The Radius The Radius is the mate of the ulna. Its upper extremity is the smallest, and the lower the largest, since its only true articulation is at the wrist. A firm membrane, however, unites this bone to its fellow nearly its whole length. It prob- ably derives its name from the fact that it measures the ra- dius of a circle which may be described by the hand about the elbow as a center. 134. The Carpus.—The bones of the Carpus or Wrist are eight in number, are small and irregular, and have the gen- eral disposition of two rows. The first row, commencing with the one nearest the thumb, contains the Scaphoid, Semilunar, In what operations do we need the two bones of the forearm ? Give the derivation of ulna. 133. What is the mate of the ulna? Where does this articulate? What is the derivation of its name ? 134. How many bones in the wrist? Give their names. Bones of the Forearm. 1, The Ulna. 2 and 3, The Sigmoid Notches. 4, The Olecranon Process. 5, Coronoid Process. 6, Nutritious Foramen. 7. Ridge for at- tachment of Interosseous Membrane. 8, Capitalum Ulnae. 9, Styloid Process. 10, Shaft of the Radius. 11, 12 and 13, Head, Neck, and Tuberosity of Radius. 14, Ob- lique Line for muscular attachments. 15, Styloid Process.
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