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Titolo:
Low-sexually performing rams but not male-oriented rams can be discriminated by cell size in the amygdala and preoptic area: a morphometric study
Autore:
Alexander, BM; Rose, JD; Stellflug, JN; Fitzgerald, JA; Moss, GE;
Indirizzi:
Univ Wyoming, Reprod Biol Program, Laramie, WY 82071 USA Univ Wyoming Laramie WY USA 82071 rod Biol Program, Laramie, WY 82071 USA Univ Wyoming, Dept Anim Sci, Laramie, WY 82071 USA Univ Wyoming Laramie WY USA 82071 g, Dept Anim Sci, Laramie, WY 82071 USA Univ Wyoming, Dept Psychol, Laramie, WY 82071 USA Univ Wyoming Laramie WYUSA 82071 ng, Dept Psychol, Laramie, WY 82071 USA US Sheep Expt Stn, Dubois, ID 83423 USA US Sheep Expt Stn Dubois ID USA 83423 heep Expt Stn, Dubois, ID 83423 USA
Titolo Testata:
BEHAVIOURAL BRAIN RESEARCH
fascicolo: 1, volume: 119, anno: 2001,
pagine: 15 - 21
SICI:
0166-4328(20010215)119:1<15:LPRBNM>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
LUTEINIZING-HORMONE; DIMORPHIC NUCLEUS; PRENATAL STRESS; SEX-DIFFERENCES; RAT-BRAIN; NERVOUS-SYSTEM; BEHAVIOR; DIFFERENTIATION; TESTOSTERONE; RECEPTORS;
Keywords:
behavior; rams; neuron size; brains; amygdala; preoptic area;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Alexander, BM Univ Wyoming, Reprod Biol Program, POB 3684, Laramie, WY 82071 USA Univ Wyoming POB 3684 Laramie WY USA 82071 mie, WY 82071 USA
Citazione:
B.M. Alexander et al., "Low-sexually performing rams but not male-oriented rams can be discriminated by cell size in the amygdala and preoptic area: a morphometric study", BEH BRA RES, 119(1), 2001, pp. 15-21

Abstract

Brain regions of male sheep behaviorally classified as high-sexually performing (n = 10), low-sexually performing (n = 8) or male-oriented (n = 9) were examined to determine if differences in reproductive behavior were associated with differences in density or sizes of neurons. High-sexually performing rams actively mounted estrous ewes, low-sexually performing rams failed to mount or had long latencies to mounting estrous ewes, and male-oriented rams mounted other rams in preference to ewes in estrus. Cell densities and sizes were quantified in Nissl stained sections through the medial amygdala (meAMY), preoptic area (POA), bed nucleus of the stria terminalis (BNST), ventromedial hypothalamic nucleus (VMH), lateral geniculate nucleus (LG)and medial geniculate nucleus (MG). Multivariate discriminant analysis based on soma sizes within nuclei of known importance for reproductive behavior and/or gonadotropin release (meAMY, POA, BNST and VMH) discriminated (Wilks Lambda P < 0.05) low-performing rams from high-performing and male-oriented rams, but did not discriminate (Wilks Lambda P = 0.14) between high-performing and male-oriented rams. Cell size in the parvocellular and magnocellular layers of the LG along with cells of the MG, structures without a specific role in reproduction, did not discriminate any of the three behaviorally defined groups of rams (Wilks Lambda P = 0.57). Density of cells present in structures important for the display of reproductive behavior (POA, meAMY, BNST) and/or gonadotropin release (POA, VMH) had no discriminating power nor did density of cells in structures important for the processing of visual (LG) or auditory (MG) stimuli. In conclusion, significant differencesin sizes of cells located within nuclei that are specifically important for the display of male reproductive behavior were found in low-sexually performing rams compared to high-sexually performing and male-oriented rams. These differences may result from neuron development in utero or occur later as a consequence of endocrine factors or behavioral experience. Neuronal cell size is a critical variable that determines excitability to synaptic inputs because cell surface area varies exponentially with cell diameter. Relatively small differences in neuron diameter could relate to functionally important differences in neuronal excitability. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 19:50:58