ANAT 322 Lecture Notes - Lecture 13: Arcuate Nucleus, Fourth Ventricle, Limbic System
3 Sep 2016
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Parvocellular (small cells) produce releasing & inhibiting hormones regulating anterior pituitary. Magnocellular: produce oxytocin & vasopressin released directly in posterior pituitary targets in periphery (smooth muscles & kidneys, respectively) Mostly looking at bilateral animals (2 halves almost symmetrical across midline) Cns (brain & spinal cord) along dorsal midline in vertebrates. Humans: dorsal & caudal identical; ventral & rostral same. Sagital: parallel to midline see from rostral to caudal. Coronal/frontal: anterior to posterior see both sides of brain; most common. Dendrites branching; are sensory organs of neurons, receive inputs form other neurons. Axon start very fine, don"t change thickness along length, fixed diameter (except swelling or veracosities) Dendrites start very thick & taper thinner toward periphery. Vertebrate neurons often myelinated; myelin formed by glial cells (schwann in pns, oligodendocytes in cns) White matter looks white; gray matter looks gray. Nucleus formed by dense concentration of cells, can be stained by same type of markers.
