{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,30]],"date-time":"2026-04-30T02:18:05Z","timestamp":1777515485825,"version":"3.51.4"},"reference-count":58,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2005,2,3]],"date-time":"2005-02-03T00:00:00Z","timestamp":1107388800000},"content-version":"vor","delay-in-days":5361,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Am. J. Anat."],"published-print":{"date-parts":[[1990,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The distribution of neuropeptide Y\u2010immunoreactive (NPY\u2010IR) perikarya, fibers, and terminals was investigated in the brain of two species of hibernatory ground squirrels, <jats:italic>Spermophilus tridecemlineatus<\/jats:italic> and <jats:italic>S. Richardsonii<\/jats:italic>, by means of immunohistochemistry. In the telencephalic and diencephalic structures studied, distinct patterns of NPY\u2010IR were observed which were essentially identical in male and female animals of both species. No differences in amount or distribution of NPY\u2010IR structures were observed between animals which had been in induced hibernation for several months before sacrifice in March\/April and those sacrificed one week after their capture in May. In some brain structures (e.g., the hypothalamic arcuate nucleus), IR cell bodies were observed only after pretreatment with colchicine.<\/jats:p><jats:p>NPY\u2010IR perikarya and fibers were found in the cerebral cortex, caudate nucleus\u2010putamen, and dorsal part of the lateral septal nucleus. Dense fiber plexuses were seen in the lateral and medial parts of the bed nucleus of the stria terminalis. The numbers of IR perikarya observed in the medial part of the nucleus increased following intraventricular colchicine injections. The accumbens nucleus exhibited few IR cells and many fibers. Claustrum and endopiriform nuclei showed a considerable number of stained cells and fibers that increased in number and staining intensity in colchicine\u2010treated ground squirrels. The induseum griseum showed a small band of IR cell bodies and varicose fibers. Bipolar of multipolar IR cells and varicose fibers were found in the basal nucleus of the amygdala.<\/jats:p><jats:p>Dense fiber plexuses as well as IR terminals were seen in the median, medial, and lateral preoptic areas of the hypothalamus. Terminals and relatively few fibers were located in the periventricular, paraventricular, and supraoptic nuclei. The anterior, lateral, dorsomedial, and ventromedial hypothalamic nuclei contained relatively large numbers of terminals and fibers. In the suprachiasmatic nuclei, dense terminals were distributed mainly in the ventromedial subdivision. In the median eminence, immunoreactive terminals were concentrated in the external layer, with fibers predominant in the internal layer. NPY\u2010IR perikarya were observed only in the arcuate nucleus of the hypothalamus and only following colchicine treatment. In the epithalamus (superficial part of the pineal gland and habenular nuclei), varicose fibers appeared mainly in perivascular locations (pineal) or as a dense plexus (habenular nuclei). These results from ground squirrels are discussed in comparison to those obtained in other species and with regard to considerations of the physiological role of NPY.<\/jats:p>","DOI":"10.1002\/aja.1001880206","type":"journal-article","created":{"date-parts":[[2005,2,26]],"date-time":"2005-02-26T16:53:28Z","timestamp":1109436808000},"page":"163-174","source":"Crossref","is-referenced-by-count":25,"title":["Neuropeptide Y localization in telencephalic and diencephalic structures of the ground squirrel brain"],"prefix":"10.1002","volume":"188","author":[{"given":"Stefan","family":"Reuss","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Edward C.","family":"Hurlbut","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joan C.","family":"Speh","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert Y.","family":"Moore","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,2,3]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"163","article-title":"Neuropeptide Y: Role in light\u2010dark cycle entrainment of hamster circadian rhythms Neurosci","volume":"50","author":"Albers H. 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