. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 498 A. STEINACKER OA MH DTCF S DMA SOG. VT FIGURE 1. Overview of the location of the cor frontale (CF) in relation to other struc- tures in the cephalothorax of the spiny lobster, PanuUrus intcrruptus. Blood flows from the main heart (MH) through the dorsal median artery (DMA) over the stomach (S) to the cor frontale (CF) from which it exits to the eyecup via the ophthalmic artery (OA) and to the supraesophageal ganglion (SOG) via the cerebral artery (CA). Other abbreviations are: dorsal tendons of the cor frontale (DT) ; si
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 498 A. STEINACKER OA MH DTCF S DMA SOG. VT FIGURE 1. Overview of the location of the cor frontale (CF) in relation to other struc- tures in the cephalothorax of the spiny lobster, PanuUrus intcrruptus. Blood flows from the main heart (MH) through the dorsal median artery (DMA) over the stomach (S) to the cor frontale (CF) from which it exits to the eyecup via the ophthalmic artery (OA) and to the supraesophageal ganglion (SOG) via the cerebral artery (CA). Other abbreviations are: dorsal tendons of the cor frontale (DT) ; single ventral tendon (VT) ; and circum- esophageal connectives (CC). Blood vessels The wall of the auxiliary heart is formed by the dilated terminal end of the dorsal median artery. Note (Figs. 2 and 3) that no muscle is contained in the wall of the artery itself. Rather, the wall of the cor frontale is composed of the same two layers as that of the dorsal median artery. The course of the blood vessels from the cor frontale can be seen in the latex injected preparation of Callinectes in Figure 4. Blood enters the cor frontale sinus from the dorsal median artery and leaves via the cerebral artery which supplies the supraesophageal ganglion, a few small vessels which supply the nearby eyestalk muscles and the two large ophthalmic arteries which supply the visual and oculo- motor system in the eyecup. (The dorsal median artery is sometimes referred to as the ophthalmic artery, a misnomer, since the true ophthalmic arteries, which run to the eyes, receive only part of the supply of the dorsal median artery.) Muscles and tendons The cor frontale muscles are two distinct strips of striated muscle originating from tendons outside the dorsal median artery. In the crab, the tendons begin as multiple insertions on the dorsal carapace just behind the middle cylinder of the eyestalk. This origin can be seen as two indentations on both the underside and on the external surface of the dorsal
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
