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This Concept Map, created with IHMC CmapTools, has information related to: nervous system, Grey matter consists of cell bodies,primarily, it also contains unmyelinated axons, derived from ectoderm middle layer arachnoid mater, lining the dura, Brain consists of midbrain, parasymapthetic NS supplies 'Rest' and 'Digest' - supplies the smooth muscle wall of hollow viscera (allows urination and defecation and enhances gastrointestinal tract peristalsis) as well as their associated exocrine glands (stimulation allows secretion). parasympathetic stimulation has a restorative role and is most active when one is calm. - supply sphincter pupilae of the eye which constricts the pupils and accomodates the lens of the eye enhancing visual acuity, - supply atria only in the heart to maintain a low basal heart rate. - forms the efferent pathway for the erection reflex, sympathetic NS supplies 'Fight' or take 'flight' - primarily supplies smooth muscle spincters of blood vessals of both hollow and glandular viscera (stimulation generally increases vasocontrictor tone), stimulation diverts blood circulation from viscera to skeletal muscles. - dilates the pupilae of the eye (increases peripheral vision) - dilates bronchoiles faciltation lung ventilation - supplies ventricles as well as the atria of the heart to suddenly increase stroke volume and heart rate respectively when necessary. - supply suprarenal medulla to secrete adrenaline into blood stream which, in turn, stimulates many effectors. - forms the efferent pathway for the ejaculation relfex, neural tube The Brain developes from the expanded craniel end. The cavity of the neural tube remains realtively wide throughout most of the brain, deep convey Pain (deep, somatic) **dull ache**, CNS supporting cells Neuroglia, Visceral effectors cardiac muscle, Brain consists of forebrain, primarily paired cerebral hemispheres, peripheral nervous system, (distributed via 12x pairs of crainiel nerves, 31x pairs of spinal nerves.) 4x types of functional fibres in PNS visceral afferent (non-myelinated), CNS Protection cerebrospinal fluid, Receptors, the origin of the sensory nerve. types Interoreceptors, located in internal organs, White matter grouped into tracts and funiculi in the brain tracts are classified according to their orientation. Each half of the spinal cord is divided into three funiculi. posterior and anterior contain ascending fibres from sensory neurons. lateral contain descending motor neurons., peripheral nervous system, (distributed via 12x pairs of crainiel nerves, 31x pairs of spinal nerves.) 4x types of functional fibres in PNS visceral efferent (smaller, slower conducting fibres), Nevous system CNS Central nervous system, Receptors, the origin of the sensory nerve. types Exteroreceptors, located in the skin and in the special sense organs, REFLEXES. a reflex is an active response to a stimulus that is involuntary and stereotyped. It is a negative feedback mechanism and more energy is expended on the response the is provided by the stimulus 2x types Visceral, Grey matter located around the periphery of the cerebral and cerebellar hemispheres (in the cortex) and in nuclei (surrounded by white matter). It is centrally located and group in columns (horns) in the spinal cord (anterior and posterior)., visceral afferent fibres properties visceral afferent (non-myelinated)