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. Author manuscript; available in PMC: 2010 May 11.
Published in final edited form as: Auton Neurosci. 2009 Feb 12;147(1-2):48–55. doi: 10.1016/j.autneu.2009.01.004

Figure 6.

Figure 6

Developmental expression of 5-HT2A receptor immunocytochemistry in the human medulla from 15 gestational weeks to term (41 gestational weeks). Immunostaining in the HG (A) and extra-raphé (B) (i.e., GC/PGCL) at 15 weeks gestation. Neurons in the extra-raphé were tightly clustered together with no obvious distinction between nuclei. Neurons are spherical and undifferentiated. At 22 weeks gestation 5-HT2A receptor immunoreactivity was observed in distinct nuclei including the DMX (C), PIO (D) and arcuate nucleus (E) with evidence of neuronal differentiation. Motor neurons in the HG expressing 5-HT2A receptor immunoreactivity at term (41 weeks gestation) (F). All images at ×40 (scale bar=100μm) except D at ×20 (scale bar=200μm). VMS, ventral medullary surface.