Comparative Anatomy Endocrine Organs

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Presentation transcript:

Comparative Anatomy Endocrine Organs Kardong Chapter 15 Part 17

Endocrine Organs Ductless organs Secrete hormones Derived from the 3 germ layers

Pituitary Gland Figure 17.1. Phylogeny of the vertebrate pituitary.

Pituitary Gland (Hypophysis) Derived from ectoderm Two divisions Neurohypophysis (post. pit.) Adenohypophysis (ant. pit.) Figure 17.2. Anterior and posterior pituitary.

Pituitary Gland (cont.’d) Neurohypophysis Infundibulum of diencephalon Stores hormones Adenohypophysis Cells evaginate away from stomadeum Secretes hormones Rathke’s Pouch Figure 17.3. Embryogenesis of the amniote pituitary .

Caudal Neurohemal Organ Endocrine gland unique to some fish (teleosts and elasmobranchs) Urophysis Neurosensory organ (releases neurosecretions = neurohormones) Occurs at tip of tail off of spinal cord Figure 17.4. Urophysis (caudal neurohemal organ).

Pineal Derived from ectoderm Produces melatonin Gonadal regulator Photoperiodism Figure 17.5. Location of the pineal gland in the human brain.

Derived from Mesoderm Figure 17.6. Adrenal gland tissue in lower vertebrates.

Figure 17.7. Adrenal gland tissue in higher vertebrates.

Adrenal Gland (cont.’d) Adrenal cortex (steroidogenic) Derived from mesoderm Adrenal medulla Derived form ectoderm From neurocrest cells (aminogenic) Figure 17.8. Cross section of adrenal gland (top) and anatomical position of the adrenal glands.

Gonads Derived from mesoderm Within kidney tissue in some ray-finned fish Corpuscles of Stannius (inhibits calcium uptake); in large salmon, can be 0.5 mm in diameter; also found in Amia (40-50 in number)

Figure 17.9. Vertebrate thyroid morphology in vertebrates.

Figure 17.10. Pancreas and islets of Langerhans.

Endodermal Origin Pancreatic Islets of Langerhans Thyroid gland Foramen cecum- reminant of thyroid invagination Bursa of Fabricius Outpocket of cloaca Thymus in nature Figure 17.11. Mammalian thyroid development.

Pharyngeal Pouches Derived from endoderm Fish Pouches 2, 3, 4, 5 (dorsal)- thymus Pouch 5 (ventral)- ultimobranchial bodies Amphibians Pouches 3, 4, 5 (dorsal)- thymus Figure 17.12. Contributions of the embryonic pharyngeal pouches to development of endocrine glands.

Pharyngeal Pouches (cont.’d) Mammals Pouches 3 & 4 (dorsal)- thymus Pouches 3 & 4 (ventral)- parathyroids No ultimobranchial bodies (incorporated directly into the thyroid as parafollicular cells – C cells) Figure 17.13. Contributions of the embryonic pharyngeal pouches to development of endocrine glands.

The End