. Journal of anatomy . e whole. There is evident behind the pituitary body a rounded mass of cartilagewhich is the dorsum sellae (Sattellehne) connected to the rest by a fibrousbridge. I do not find that Levn noticed that this chondrifies separately, asthe sections he had probably did not show (Fischer has noticed it in themonkey). In my 19 mm. embryos and 21 mm. embryos it is quite Notes on the Development of the Human Sphenoid 209 independent ; also in a 19 mm. one lent me by Professor Mi not ofHarvard. P. pituitary; dorsum sellae or saddle ridge; noto-ehord; basilar plate; S.
. Journal of anatomy . e whole. There is evident behind the pituitary body a rounded mass of cartilagewhich is the dorsum sellae (Sattellehne) connected to the rest by a fibrousbridge. I do not find that Levn noticed that this chondrifies separately, asthe sections he had probably did not show (Fischer has noticed it in themonkey). In my 19 mm. embryos and 21 mm. embryos it is quite Notes on the Development of the Human Sphenoid 209 independent ; also in a 19 mm. one lent me by Professor Mi not ofHarvard. P. pituitary; dorsum sellae or saddle ridge; noto-ehord; basilar plate; S. prepituitary part of sphenoid; D. dens;A. body of axis. Fig. 3 is a photograph of a sagittal section of the head of the 21 mm-embryo from which the reconstruction (tig. 2) was made, and at showsthis independent rod of cartilage, which is rounded in section and connectedby a fibrous band with the clivus region. In a 30 mm. embryo lent byProfessor Bryce of Glasgow this rod of cartilage is no longer independent. -Cx Fig. 3. Levi has conveniently divided the young sphenoid into three segments: 1. The hindmost—clivus—which stretches from the connective tissuebridge which connects it with the occipital cartilage, up to the sella. 2. The sella. 3. The sulcus chiasmatis, which is the smallest and most anterior describes independent chondrification of the lesser (orbital) wings. This I confirm in all my sections and in the models. Fig. 4 is a drawing of a model from sections of a 19 The orbital wings are seen ascending almost vertically from themedian mass (). A nucleus of chondrification is seen at This 210 Professor Fawcett is connected by a bridge of connective tissue and procartilage with thecorpus sphenoidale (). Ov/
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
