HEALTHY ANATOMY.
106. Horizontal section through sphenoid bone and orbits. 1847. Dr. J. C. Warren.
107. Cranium, showing a section through the bones of the face, from side to side. 1847. Dr. J. C. Warren.
108. Portion of a skull, to show the nasal cavity. 1847.
Dr. J. G. Warren.
109. Ditto. Shows the frontal, aethmoid and sphenoid cells ; the nasal duct, antrum High., and the Eustachian tube, with their membranous portions. Carotid injected where it passes through the bone. 1862.
Dr. O. W. Holmes.
110. Mate to the last ; macerated. Central lamella, with the vo- mer, etc., shown. 1862. Dr. O. W. Holmes.
111. Sections of the neck of the femur, to show how its ana- tomical structure explains the phenomena of extra-capsular fracture, to which it is so liable ; made by Dr. Bigelow, and described by him as follows :
"To exhibit this structure, which has hitherto been un- noticed, sections should be made in the following man- ner :
"A well-developed femur is to be secured, in a nearly vertical position ; the axis of the neck being carefully placed in the plane of the horizon. A thin slice is now taken from the top of the neck, including at its extremities the top of the head of the bone, and the top of the great trochanter ; this section passing through the neck, in a direction parallel with the plane of the horizon. A sec- ond, third, and fourth slice, each one-fourth of an inch thick, are now to be sawed from the neck, parallel with the first. There will now remain, attached to the shaft of the femur, only the lower part of the head, and a narrow lower isthmus of the neck. On examining the cut surface of this last section, it will be found that the anterior wall of the neck is one-eighth of an inch thick, or more, while the posterior wall is of a papery thickness only.
