Section 11161.5 deals specifically with child abuse, and declares in pertinent part that in any case in which a minor is under a physician's care or is brought to him for diagnosis, examination or treatment, and " it appears to the physician " from observation of the minor that the latter has any physical injuries " which appear to have been inflicted upon him by other than accidental means by any person, " he must report that fact by telephone and in writing to the local law enforcement authorities and the juvenile probation department.