The correct sequence of embryonic axonal growth from a nerve cell body is a. filopodia, growth core pioneer fibers, fibers b. pioneer fibers, growth core filopodia, fibers c. growth core, Filopodia, pioneer fibers, fibers d. neofibers, filopodia, growth core fibers Postnatal bone occurs mainly in the a. diaphysis b. epiphyseal disk c. flat bone d. periosteum e. modullary cavity The correct sequence of intramembranous osteogenesis a. mesenchyme, chondroblast, cartilage, matrix, ossification b. mesenchyme, osteoblast, osteocyte, matrix, ossification. c. osteoblast, mesenchyne, osteocytes, matrix, ossification d. chrondosteon, osteomembrane, matrix, ossification Most of the spinal nerves originate from the a. myelencephalon b. metencephalon c. mesencephalon d. diencephalon e. telencephalon At the eighteen hour stage of chick development a. there are approximately 25 somites formed. b. the primitive streak is the predominant external The primitive streak develops in this/these type(s) of egg(s). a. telolecithal b. isolecithal c. mesolecithal d. a & b e. a, b & c The development of which of these structures agrees with von Bear’s theory in nammalian embryogenesis? a. mandibular arch b. metanephros c. heart d. a & b e. a, b & c This is the primitive streak structure from which the notochord and the neural tube begin to form cephalad. a. primitive fold b. Henson’s node c. primitive plate d. primitive grave e. primitive pit. In the avain egg cleavage occur in the a. germinal disk b. embryonic disk c. yolk d. blastocyst The fully developed human placenta is composed of a. chorionic vesicles and uterine myometrium b. chorionic vesicles and uterine endometrial blood cells. c. allantoic vesicles and uterine endomatrial blood cells. d. allantoic villi and uterine blood capillaries. The correct sequence of development of the chorien is a. hypoblast, eytotrophoblast, trophoblastoderm, chorion. b. epiblast, trophoblast, cytotrophoblast, syntrophoblast, chorion. c. endoderm, hypoblast, trophoblast, cytotrophoblast, synthrophoblast, chorion. d. hypoblast, epiblast, trophoblastoderm, synthrophoblast, ehorion. The yolk sac. 1. produces precursor cells for blood cells 2. is present in most vertebrate embryos