. Chordate morphology. Morphology (Animals); Chordata. vessel passes between the myomeres and opens into the myocoel, the cavity between the myomere and the body wall. The ventral vessel passes down on the inner aspect of the body wall and enters the cardinal vessel. Irregular branches from the dorsal aorta also extend to the intestine. The dorsal aorta back into the tail as the caudal artery, and blood is collected in the tail by a caudal vein. The vein ex- tends forward to enter the subintestinal vessel and the pos- terior cardinal of the right side. The blood of Amphioxus is withou
. Chordate morphology. Morphology (Animals); Chordata. vessel passes between the myomeres and opens into the myocoel, the cavity between the myomere and the body wall. The ventral vessel passes down on the inner aspect of the body wall and enters the cardinal vessel. Irregular branches from the dorsal aorta also extend to the intestine. The dorsal aorta back into the tail as the caudal artery, and blood is collected in the tail by a caudal vein. The vein ex- tends forward to enter the subintestinal vessel and the pos- terior cardinal of the right side. The blood of Amphioxus is without cells, and the vessels, with the exception of the dorsal aorta, are without linings! The subintestinal vein, hepatic vein, endostylar vessel and Its bulbuli (tiny expansions), and the nephric glomerulae are contractile. The term glomerulus refers to a knot, or in this case a net, of small blood Such "knots" of small arterial vessels are associated generally with excretory struc- tures (Figure 1-4 D,E). The nervous system (Figures 1-2 to 1-4) consists of a dor- sal nerve tube and paired segmental nerves. In this tube are scattered photosensory cells, the cells of Hesse and Joseph. Those of Joseph are distributed anteriorly and dor- sally, those of Hesse along the inner face of the tube through- out most of its length. The former are cells enclosed by a cup of pigment granules. Giant cells (of Rhodes) are seg- mentally arranged for much of the length of the tube, and their fibers run ventrally along the cord, on the side opposite the cell body. Anteriorly the cord is slightly expanded and its central cavity enlarged to a ventricle. The ventral and dorsal nerves of each segment are separate. The ventral root lies loop of gut. stolon. opposite the myotome; the dorsal root passes between the myotomes, posterior to the ventral root. The dorsal root of one side is across from the ventral root of the other side. The dorsal root is largely sensory but contains moto
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