The findings of the doctors who conducted the autopsy were consistent with the observations of the doctors who treated the President at Parkland Hospital. Dr. Charles S. Carrico, a resident surgeon at Parkland, noted a small wound approximately one-fourth of an inch in diameter (5 to 8 millimeters) in the lower third of the neck below the Adam’s apple.[C3-173] Dr. Malcolm O. Perry, who performed the tracheotomy, described the wound as approximately one-fifth of an inch in diameter (5 millimeters) and exuding blood which partially hid edges that were “neither cleancut, that is, punched out, nor were they very ragged.”[C3-174] Dr. Carrico testified as follows: Q. Based on your observations on the neck wound alone did you have a sufficient basis to form an opinion as to whether it was an entrance or an exit wound? A. No, sir; we did not. Not having completely evaluated all the wounds, traced out the course of the bullets, this wound would have been compatible with either entrance or exit wound depending upon the size, the velocity, the tissue structure and so forth.[C3-175] The same response was made by Dr. Perry to a similar query: Q. Based on the appearance of the neck wound alone, could it have been either an entrance or an exit wound? A. It could have been either.[C3-176] Then each doctor was asked to take into account the other known facts, such as the autopsy findings, the approximate distance the bullet traveled and tested muzzle velocity of the assassination weapon. With these additional factors, the doctors commented on the wound on the front of the President’s neck as follows: Dr. CARRICO. With those facts and the fact as I understand it no other bullet was found this would be, this was, I believe, was an exit wound.[C3-177] Dr. PERRY. A full jacketed bullet without deformation passing through skin would leave a similar wound for an exit and entrance wound and with the facts which you have made available and with these assumptions, I believe that it was an exit wound.[C3-178] Other doctors at Parkland Hospital who observed the wound prior to the tracheotomy agreed with the observations of Drs. Perry and Carrico.[C3-179] The bullet wound in the neck could be seen for only a short time, since Dr. Perry eliminated evidence of it when he performed the tracheotomy. He selected that spot since it was the point where such an operation was customarily performed, and it was one of the safest and easiest spots from which to reach the trachea. In addition, there was possibly an underlying wound to the muscles in the neck, the carotid artery or the jugular vein, and Dr. Perry concluded that the incision, therefore, had to be low in order to maintain respiration.[C3-180]