58 



H I T C II C O C K ' S ANATOMY 



of the Triceps Muscle. 9, Posterior, or An Anterior View of the Humerus of th« 

 Vertebral Margin. 10, The Spine. 11, Eight Side. 1, The Shaft, or Diaphysis of 

 Smooth Facet for the Trapezius Muscle. the Bone. 2, The Head. 3, Anatomical 

 12, Acromion Process. 13, Nutritious Fo- Neck. 4, Greater Tuberosity. 5, Lesser 

 raraen. 14, Coracoid Process. 15, Part of Tuberosity. 6, The Bicipital Groove. 7, 

 the Origin of the Deltoid Muscle. External Bicipital Eidge for the insertion 



of the Pectoralis Major. 8, Internal Bici- 

 pital Eidge. 9, Point of insertion of the Deltoid Muscle. 10, Nutritious Foramen. 

 11, Articular Face for the Head of the Eadius. 12, Articular Face for the Ulna. 

 13, External Condyle. 14, Internal Condyle. 15, 16, The Condyloid Kidges. 17, 

 Lesser Sigmoid Cavity. 



wards, and so formed into grooves and elevations that it ar- 

 ticulates with the ulna in essentially the same manner as the 

 two portions of a door hinge. 



132. Fore-arm. The Ulna, — There are two bones in the 

 forearm, one of which only is articulated with the humerus, 

 and the other to the bones of the wrist alone, in order to al- 

 low the rotation of the hand upon the bones of the forearm 3 



What is the shape of the lower, or ulnar articulation ? 132. How many bones in the 

 forearm ? Why are there two instead of one ? 



