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Definition
| mass of blastomeres produced after several synchronous cleavages |
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Definition
| central region of blastoderm underlain by the subgerminal cavity |
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Definition
| peripheral region where blastoderm cells directly contact yolk |
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Definition
| cluster of thickened hypoblast cells at one end of the epiblast |
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Definition
| diffusible proteins secreted by one group of cells that act on other nearby cells |
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Definition
| influence of the notochord and prechordal mesoderm on the overlying midline ectoderm, causing it to form neural ectoderm |
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Term
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Definition
| considered to be a fourth germ layer with endoderm, mesoderm, and ectoderm |
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Term
| anterior (cranial) intestinal portal |
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Definition
| the boundary between the enclosed foregut and open midgut |
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Term
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Definition
| seals the rostral end of the foregut from the outside world |
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Definition
| portion of the oral cavity external to the oropharyngeal membrane |
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Definition
| on either side of the midline |
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Definition
| loose aggregates of cells formed by somites |
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Term
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Definition
| formed by ventromedial wall of somite; become vertebrae, ribs, scapulae |
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Term
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Definition
| borders inner margin of somite; will form skeletal muscle |
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Definition
| lateral wall of somite; will form dermis |
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Term
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Definition
| spinal cord, rhombencephalon, mesencephalon, prosencephalon |
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Term
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Definition
| processes which receive and process incoming neuronal signals |
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Term
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Definition
| single branched process which transmits ouput signals |
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Term
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Definition
| what axons of motor neurons exit the spinal cord as |
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Term
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Definition
| formed when ventral roots become bundled together with the peripheral processes of dorsal root ganglia cells |
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Term
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Definition
| mixed (sensory and motor) bundle |
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Term
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Definition
ganglion - collection of neuron cell bodies outside the CNS
nucleus - collection of neuron cell bodies located inside the CNS |
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Term
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Definition
| bony vertebral column grows faster than the spinal cord, pulling spinal nerves caudally from their segment of origin toward their intervertebral foramina of exit |
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Term
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Definition
| becomes the medulla of the adult brain |
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Term
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Definition
| formed by rhombic lip and choroid plexus moving together |
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Term
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Definition
| two pairs of rounded elevations formed from the dorsolateral walls of the mesencephalon |
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Term
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Definition
| far rostral end of the diencephalon where the original termination of the neural tube is |
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Term
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Definition
| guide migrations of neurons into distinct layers in the telencephalon |
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Term
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Definition
| localized ectodermal thickenings |
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Term
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Definition
| develop into sensory cells of the trigeminal ganglion for the sense of touch on the face |
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Term
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Definition
| form sensory ganglia of the face |
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Term
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Definition
| specialized endings which form on sensory neurons as a result of inductive interactions in the periphery |
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Term
| canial neural crest cells |
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Definition
| form coniofacial mesenchyme that enters branchial arches and differentiates into cartilage, bone, and connective tissue |
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Term
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Definition
dorsally - become pigment-synthesizing melanocytes in skin, hair, or feathers
ventrally - become sensory neurons of the dorsal root ganglia, myelinating Schwann cells, neurons of sympathetic ganglia, chromaffin cells of adrenal medulla, neurons around the aorta |
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Term
| vagal and sacral neural crest cells |
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Definition
| generate parasympathetic ganglia |
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Term
| cardiac neural crest cells |
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Definition
| form the aorticopulmonary septum |
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Term
| cells that develop from neural crest |
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Definition
| neuronal cells, Schwann and sheath cells, pigment cells, endocrine and paraendocrine cells, facial structures (bones and cartilage), ciliary muscle of eye, connective tissue (tooth papillae, dermis of face, corneal fibroblasts) |
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Term
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Definition
| cranial nerves and ganglia, dorsal root gangia, peripheral nerves associated with the spinal cord, autonomic nervous system, and enteric nervous system |
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Term
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Definition
| placodes and neural crest cells |
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Term
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Definition
| afferents derived from placodes |
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Term
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Definition
| motor nerves that innervate striated (skeletal) muscle |
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Definition
| motor nerves that innervate smooth muscle; motor portions of the autonomic nervous system |
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Term
| special visceral efferent |
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Definition
| motor innervation of muscle derived from branchial arches |
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Term
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Definition
| small neurons in loosely organized network in smooth muscle of the digestive tract |
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Definition
| cells that are loosely and irregularly arranged |
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Term
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Definition
| self mediated cell death that occurs during a specified event |
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Term
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Definition
| genetically controlled migration/movement of cells in expansion of the epiblast |
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Term
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Definition
| self mediated cell death that occurs during a specified event |
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Term
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Definition
| genetically controlled migration/movement of cells in expansion of the epiblast |
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Term
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Definition
| an increase in the size or number of cells in the whole or any part of an organism |
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Term
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Definition
| an increase in the size or number of cells in the whole or any part of an organism |
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Term
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Definition
| an increase in the size or number of cells in the whole or any part of an organism |
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Term
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Definition
| the establishment of programmed subsets of cells in proper relation to each other and surrounding tissue |
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Term
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Definition
| the mechanism underlying the theory that the action of one tissue, or at least the physical presence, is necessary for the development of another tissue |
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Term
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Definition
| those abnormalities present at birth that result from errors arising during development |
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Term
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Definition
| the time during shich each organ system in the body is being established, when obligatory inductive tissue interaction and morphogenesis are occurring |
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Term
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Definition
| an external agent that can disrupt the development of the embryo causing abnormalities |
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Term
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Definition
| where the expression of one gene is modified by other gene products resulting in a wide range of phenotypes |
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Term
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Definition
| when many genes have several different effects |
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Term
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Definition
| part of the stomodeum lined with ectoderm that forms the pituitary gland when opened to the infindibulum |
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