Mammillary layer

Fig. 11.1. Cross-section of a chicken egg - a schematic representation. Egg yolk 1 germinal disc (blastoderm), 2 yolk membrane, 3 latebra, 4 a layer of light colored yolk, 5 a layer of dark colored yolk, 6 chalaza, 7 egg white (albumen) thin gel, 8 albumen thick gel, 9 pores, 79 air cell, 11 shell membrane, 12 inner egg membrane, 13 shell surface cemented to the mammillary layer, 14 cuticle, and 15 the spongy calcareous layer...

The histaminergic neurons have several well-developed primary and secondary dendrites that overlap with each other. Furthermore, long dendrites from histaminergic neurons located close to the mammillary recess or to the basal surface of the mammillary body appear to penetrate into the ependymal layer and make contact with cerebrospinal fluid. Thus, it is likely that neuroactive substances such as cytokines, present in the cerebrospinal fluid, may influence the discharge activity of TMN neurons (Wada et al., 1991). Unlike the dopaminergic neurons, which are known to release dopamine from their dendrites, there is no evidence that these histaminergic dendrites store and/or release HA. 

The D3 receptor was also found in the hippocampal formation (granule cell layer of the dentate gyrus) and in the amygdaloid complex (anterior, basomedial and medial nuclei). In the posterior hypothalamus, D3 receptor was found to be expressed in the medial mammillary nucleus (Bouthenet et al., 1991). 

As compared to the very high concentration of the Di receptor, D1B mRNA and D1B receptor in the rat were found in a lower concentration in the frontal cortex, NAc, olfactory tubercle, and striatum. In contrast, higher levels than Dj were found in distinct layers of the hippocampus, as well as in the mammillary nuclei and anterior pretectal nuclei (Tiberi et al., 1991 Meador-Woodruff et al., 1992 Ariano et al., 1997b). The parafascicular nucleus of the thalamus was found to be particularly rich in D1B receptors. 

Mo5DL motor trigeminal nucleus, dorsolateral part 56-57 Mo5VM motor trigeminal nucleus, ventromedial part 56-57 Mol molecular layer of the dentate gyrus 35, 79, 87, 106 mp mammillary peduncle 39-43, 80-81, 94-95 MPA medial preoptic area 18-23, 80-81, 93-97 MPB medial parabrachial nucleus 54-60, 83-84, 99-101 MPBE medial parabrachial nucleus external part 56-57 MPn medial pontine nucleus 51 MPO medial preoptic nucleus 23-24, 80, 92-97 MPOC medial preoptic nucleus, central part 21-22, 80 MPOL medial preoptic nucleus, lateral part 18-22 MPOM medial preoptic nucleus, medial part 21-22 MPT medial pretectal nucleus 38-41, 80, 109-110 MRe mammillary recess of the 3rd ventricle 36-38, 79 MRVL medial rostroventrolateral medulla 67-68 MS medial septal nucleus 13-18, 79-80, 103-108 MSO medial superior olive 54-60, 90... 

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