Endocrine System Endocrine System Overview Overview Chemical classification of hormones Chemical classification of hormones Gland may be entire organ or interspersed Gland may be entire organ or interspersed bits of tissue bits of tissue Ductless glands produce hormones Ductless glands produce hormones Target tissues are identified by receptors Target tissues are identified by receptors www.freelivedoctor.com www.freelivedoctor.com
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Endocrine System OverviewEndocrine System Overview
Chemical classification of hormonesChemical classification of hormones Gland may be entire organ or interspersed Gland may be entire organ or interspersed
bits of tissuebits of tissue Ductless glands produce hormonesDuctless glands produce hormones Target tissues are identified by receptorsTarget tissues are identified by receptors
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HypothalamusHypothalamus
Control Center for Control Center for internal environmentinternal environment
Regulates nervous and endocrine systems via 3 mechanisms:
1. ANS centers exert nervous control on adrenal medulla
2. ADH and Oxytocin production
3. Regulatory hormone production (RH and IH) controls pituitary gland directly and all other endocrine glands indirectly
Structure:Structure: Infundibulum - connection to hypothalamus Infundibulum - connection to hypothalamus In the sella turcica In the sella turcica Two parts with an embryonic double originTwo parts with an embryonic double origin
Posterior Pituitary = neurohypophysisPosterior Pituitary = neurohypophysis Storage Storage shed for ADH and Oxytocin (produced in ?)shed for ADH and Oxytocin (produced in ?)
Anterior Pituitary = adenohypophysisAnterior Pituitary = adenohypophysis production production of 7 peptide hormones, of 7 peptide hormones, see fig 19.5see fig 19.5