ANTERIOR HYPOTHALAMIC LESIONS 
MAMMILLARY ftOOT 
Figure 16. The cross hatched area indicates the portion of 
the hypothalamus the integrity of which is suggested to be vital to 
temperature maintenance in the rat. It has been projected upon a 
mid-sagittal section of a rat brain (left) and represents the loci of 
the sites of bilaterally symmetrical lesions in twelve animals 
which could not regulate their body temperatures while in a cold 
environment. 
On the right is the same area shown as a projection upon a 
horizontal section of a rat brain. 
Figure 17. A diagram of a transverse section through the fore- 
brain of a goat slightly in front of the anterior commissure. Black 
triangles indicate points where shivering, peripheral vasocon- 
striction and inhibiton of polypneic panting were obtained as effects 
of electrical stimulation. Encircled triangles indicate points where 
in addition to the above mentioned effects piloerection and a huddling 
up of the animals were observed. 
At right is a diagram of a horizontal section through the septal 
area and the thalamus of the goat at a level slightly dorsal to the 
anterior commissure. 
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