Discussion 



77 



heavier (P<0.01) than the controls and were considered efTectively lesioned. Twenty- 

 seven lesioned rats had uteri which were comparable to those of the controls and were 

 designated as ineflectively lesioned. The mean ovarian weight of the effectively lesioned 

 animals was significantly greater (/'<0.05) than the mean of the controls; three pairs 

 of these ovaries had corpora lutea. No differences were observed in body or adrenal 

 weights. 



Figure 2 shows on a composite diagram the bilateral destruction produced by all 

 amygdaloid lesions associated with increased uterine weight. The area included 

 portions of the cortical, medial and basal medial nuclei and had a longitudinal extent 

 of about 1 mm. In contrast to the results obtained in the hypothalamus, these lesions 



Fig. 2. Diagram of a transverse section through the amygdaloid complex showing the 

 total area destroyed by all effective lesions (dark shading), and the location of ineffective 

 lesions in adjacent brain structures (dotted lines). Abbreviations used: BL, basal amygdaloid 

 nucleus, lateral part; BM, basal amygdaloid nucleus, medial part; C, claustrum; CE, central 

 amygdaloid nucleus; CO, cortical amygdaloid nucleus; L, lateral amygdaloid nucleus; 

 M, medial amygdaloid nucleus; OT, optic tract; PYR, pyriform cortex; ST, stria terminalis. 



all shared a common area of destruction, indicated by the dark shading, that included 

 parts of the medially located nuclei and the area between which contains the converging 

 fibers of the stria terminalis. Bilateral involvement of this composite area was question- 

 able in one effective lesion, and one was located in the anterior caudato-putamen 

 complex. The dotted lines mark locations of all ineffective lesions placed bilaterally 

 in the immediate vicinity of the effective amygdaloid area with the exception of one 

 that was located in the composite area. In addition, bilaterally symmetrical ineffective 



