ONE FIGUREThe dog is frequently subjected to traumatic injuries which are the result of being struck by automobiles and in many of these cases it is found that the brachial plexus is damaged with resultant paralysis of some of the muscles of the thoracic limb. It is, therefore, of clinical importance to study the nature and extent of such injuries in order to arrive at an intelligent prognosis. Such a study has been carried out and preliminary findings reported by Allani et al.( '49). Early in the course of this study it became apparent that a niore detailed knowledge of the normal plexus than has thus far been presented in the literature was required. Accordingly, a series of dissections of the plexus of normal dogs were made, and it is the purpose of this paper to record the observations made from these dissections.Ellenberger and Baum ( '47)' Bradley and Grahame ( '48) and Miller ( '48) all agree that the brachial plexus of the dog is formed from the ventral branches of the last three cervical and first two thoracic spinal nerves. Sisson and Grossman ('38) state that its origin is from the last 4 cervical and first thoracic spinal nerves. Howell ('37) states that the l Acknowledgment is made of the assistance given this "This study was aided in part by a faculty grant of M.D., deceased.

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