01:119:116 Lecture Notes - Lecture 13: Corpus Allatum, Anterior Pituitary, Thyroid
15 Mar 2016
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Molting: larva- grows, sheds exoskeleton, secretes new one. Endocrine pathway: neurosecretory cells in brain produce ptth, ptth signals protheracic gland to produce ecdysteroid. Ecdysteroid also controls metamorphosis: juvenile hormone (jh) Ecdysteroid stimulates increase in size and molting. Adult emerges = metamorphosis: fig 45. 12. Synthetic jh: used in insecticide, prevents maturation into reproducing adults (cid:1) Produces neurohormones: link between nervous and endocrine systems, connected to pituitary gland by portal vessels. Modes of action: produces releasing hormones (rh) and inhibiting hormones (ih) Stimulate or inhibit release of specific hormones from anterior pituitary: produces antidinretic hormone (adh) and oxytocin. Produced by cell bodies of neurons in hypothalamus. Stored in vesicles in axon terminals until neuron stimulated: (produces, not secrete)** (cid:1) Posterior pituitary: secretes adh and oxytocin. Released when body needs to conserve water. Smaller volume of urine will be produced. Influences maternal care, pair bonding, sexual activity: fig 45. 14.
