![]() The photoreceptor cells of each eye or sensillum project their axons centrally via a characteristic cephalic or segmental nerve which carries the photosensory input to the brain or to the segmental ganglion. 2016 113(5):E500-E508.The medicinal leech, Hirudo medicinalis possesses two types of photosensory organs: five bilateral pairs of eyes embedded in two longitudinal rows in the dorsal surface of the head, and seven bilateral pairs of sensilla situated in both the dorsal and the ventral surface of each of the 21 body segments. Proceedings of the National Academy of Sciences. Impact of adolescent marijuana use on intelligence: Results from two longitudinal twin studies. Jackson NJ, Isen JD, Khoddam R, et al.Long-term effects of marijuana use on the brain. Filbey FM, Aslan S, Calhoun VD, et al.Persistent cannabis users show neuropsychological decline from childhood to midlife. Marijuana use during pregnancy and breastfeeding: implications for neonatal and childhood outcomes. Intrauterine cannabis exposure leads to more aggressive behavior and attention problems in 18-month-old girls. El Marroun H, Hudziak JJ, Tiemeier H, et al.Differential effects on cognitive functioning in 9-to 12-year olds prenatally exposed to cigarettes and marihuana. Prenatal substance exposure: effects on attention and impulsivity of 6-year-olds. Leech S, Richardson GA, Goldschmidt L, Day NL.Effects of prenatal marijuana exposure on child behavior problems at age 10. Functional Connectivity Disruption in Neonates with Prenatal Marijuana Exposure external icon. Structural and functional imaging studies in chronic cannabis users: a systematic review of adolescent and adult findings. Batalla A, Bhattacharyya S, Yuecel M, et al.Washington, DC: The National Academies Press 2017. ![]() The health effects of cannabis and cannabinoids: the current state of evidence and recommendations for research.
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