. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. 876 THE DEVELOPING ENDOCRINE GLANDS. STOMOOAEUM MANDIBULAR PROCESS Fig. 365. The pancreatic islets and pituitary gland. (A) Origin of islet tissue from developing pancreatic ducts and acini. 1 = young bud; 5 = older bud. (Modified from Arey, '46, Developmental Anatomy, Philadelphia, Saunders.) (B-E) Diagrams of pi- tuitary gland conditions in Petromyzon (B), Runa (C), Reptile (D), and Man(E). (Modi- fied from Neal and Rand, 1939, Chordate Anatomy,
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. 876 THE DEVELOPING ENDOCRINE GLANDS. STOMOOAEUM MANDIBULAR PROCESS Fig. 365. The pancreatic islets and pituitary gland. (A) Origin of islet tissue from developing pancreatic ducts and acini. 1 = young bud; 5 = older bud. (Modified from Arey, '46, Developmental Anatomy, Philadelphia, Saunders.) (B-E) Diagrams of pi- tuitary gland conditions in Petromyzon (B), Runa (C), Reptile (D), and Man(E). (Modi- fied from Neal and Rand, 1939, Chordate Anatomy, Philadelphia, Blakiston.) (F) Origin of Rathke's pouch material from inner layer of epidermal ectoderm in early tadpole of Rana. (G-I) Developmental stages of hypophysis in human embryo. associated with the pancreas. In some teleost fishes, the two glands are sep- arated although both are derived from the entoderm. The pancreatic islets are classified as belonging to the solid, non-storage type of endocrine gland. 2. Pituitary Gland (Hypophysis Cerebri) Previous to the latter part of the last century, the function of the pituitary gland was presumed to be one of mucous secretion, hence the name pituitary from the Latin, pituita, a nasal secretion. It was so regarded by Vesalius in 1543. The English anatomist, Willis, believed that the pituitary gland secreted the cerebrospinal fluid. The pituitary gland (fig. 365E and I) is composed of three main parts as follows: a. Anterior Lobe The anterior lobe (pars anterior) is composed of two subdivisions: (1) a large anterior lobe (pars distalis), and (2) a smaller glandular mass (pars tuberalis).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nelsen, Olin E. (Olin Everett), b. 1898. New York, Blakiston
Size: 1826px × 1368px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
