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Acanthias Anat anatomy animals anlage appear average blood body weight brain cartilages caudal cavities cent centers changes chronic inanition connective tissue corpuscles corresponding cortex cortical cytoplasm decrease diameter digitiform gland dorsal embryo epithelium female albino rat fetal figure follicles gastric grams granules growth held at maintenance hibernation hypophysis increase inguinal gland interstitial cells intestine kidney later layer length lipoid lumen lumina male mammary glands medulla membrane mesenchyma micra milk ducts mitochondria new-born nipple normal nuclei observed organs outer ovary pars intermedia pessulus pharynx portion postnatal present primary duct rats held rats underfed refed refeeding relative renal corpuscles selachians shown stage stain stomach stroma structure suprapericardial body suprarenal suprarenal gland surface test rats three weeks thyreoid thyroid gland tion trachea tubules underfed from birth underfeeding variable ventral volume wall weeks of age young rats zone
Sivu 362 - ... of the fundic portion. These slight variations are, however, of no fundamental importance, for they do not signify that the glands differ in character. All of the gastric glands are unbranched, flask-shape structures. Never have I been able to find the bifurcated forms described by Peterson ('09). He believes that the neck cells of the gland are of a rather primitive character during their early history, and that they may give origin to a side bud which with further differentiation, gives to...
Sivu 291 - The art of medicine is thus divided amongst them : each physician applies himself to one disease only, and not more. All places abound in physicians ; some physicians are for the eyes, others for the head, others for the teeth, others for the parts about the belly, and others for internal disorders.
Sivu 430 - JACKSON, CM 1912 On the recognition of sex through external characters in the young rat.
Sivu 185 - Studies on the mammary gland. III. A comparison of the developing mammary glands in male and female albino rats from the late fetal stages to ten weeks of age. Anat. Rec., vol.
Sivu 278 - On the weights of the abdominal and the thoracic viscera, the sex glands, ductless glands and the eyeballs of the albino rat (Mus norvegicus albinus).
Sivu 218 - ... absent. The brown rat is more prolific than either the roof rat or the black rat. The female brown rat has usually 12 mammae — 3 pairs of pectoral and 3 pairs of inguinal — although these numbers are not constant, one or more teats frequently being undeveloped. The black rat and the roof rat have only 10 mammae — 2 pairs of pectoral and 3 pairs of inguinal — with but little tendency to vary. Records of actual observations on the number of young confirm the deductions that might be drawn...
Sivu 304 - This process of scientific inquiry involves peculiar qualifications which can not be disregarded by any one who thinks of trying it. Research implies in the first place seeking again over a region which has been previously traversed in order to learn what other men have done and the point where their labors ended. To make progress sure, therefore, previous records must be carefully studied. The failure to [ pay this just tribute to those who have labored before has not seldom led to fruitless effort...
Sivu 373 - Maurer believes that De Meuron described correctly the origin of the postbranchial bodies, but that he has confused their later development with the epithelial derivatives of the pouches, which come to lie near the thyreoid.
Sivu 225 - Weitere Untersuchungen über Ontogenie und Phylogenie des Mammarapparates der Säugetiere. Anat. Anz., Bd. 21. 1908 Die Entwickelung des Mammarapparates der Monotremen, Marsupialier und einiger Placentalier. I. Entwicklung und Ursprung des Mammarapparates von Echidna. Semon's Zoolog. Forschungsreisen, Bd. 4, Lieferung 5. 1910 Der Mammarapparat (Entwicklung und Stammesgeschichte).