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Vestibular Function and Anatomy

The vestibular system, defined as the peripheral vestibular motion detectors and related central nervous system structures, senses motion in space and converts that motion into information that the remainder of the central nervous system can use to generate appropriate motor reflexes or facilitate complex processes such as the coordination of head, eye, and trunk movements or updating one's perception of his or her orientation in the world. The vestibular system, like the auditory system, converts physical stimuli into neural signals, but the vestibular system detects angular and linear acceleration, rather than sound. The vestibular system is present in all vertebrates and many invertebrates. Yet, despite the importance of spatial orientation in all mobile animals, the vestibular system is largely underappreciated until a malfunction occurs, at which point patients present to a physician, often an otolaryngologist, for treatment and education. This chapter discusses the anatomy of...
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Blood Supply of the Heart

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Heart Structure and Blood Supply It seems odd that the tissues making up the heart must have their own separate blood supply. You might think that the torrent of blood rushing through the heart every minute would more than adequately meet the needs of the organ. The walls of the heart, however, consist of layers of specialized muscle. These walls are quite thick—the wall of the left ventricle is often over 1 inch thick. Since the lining of the heart is watertight, the blood cannot seep through the layers of muscle to provide the nourishment essential to these constantly working masses. Blood is carried through the muscle layers that form the heart wall by means of the two coronary arteries. These two small vessels branch off the aorta just after it leaves the heart and curl back across the surface of the chambers, sending twigs through the walls (Fig. 4-1). The coronary arteries are so named because of the supposed resemblance to a crown or “corona” of the little arteries as they...
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Neonatology and Blood Transfusion (Developments in Hematology and Immunology, Vol. 39)

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Proceedings of the Twenty-Eighth International Symposium on Blood Transfusion, Groningen, NL, Organized by the Sanquin Division Blood Bank North-East, Groningen. It is in many ways fitting that the last of these international symposia on blood transfusion should end with neonatal blood transfusion. The most fragile, least well studied and most at risk population requires special care and concern. We need to expand our knowledge of their unique physiology, biochemical pathways and in planning treatment and interventions, always "do no harm." This proceedings of the last Groningen symposium presents a wealth of information on developmental immunology, the molecular basis of haematopoeisis, physiological basis of bleeding and thrombosis, transfusion risks and benefits and lastly, future therapies. Infants provide us with much to learn but in turn they will be the providers of (through cord blood) and the recipients of (through cellular engineering) the best that science can offe...
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