. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B Forward view Rear view. Ventral Figure 1. (A) Diagram of the statocyst of Octopus viewed from the side. The statocyst sac is suspended within the statocyst cavity by fibrous strands. There are two areas of receptor epithelium: a single, oval shaped macula with an attached statolith, and a crista strip that passes around the inside of the sac. such that it covers all three planes. The crista strip is divided into 9 segments, each segment carries a cupula (not shown). After Budelmann. 1980. (B) A forward and rear view of the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B Forward view Rear view. Ventral Figure 1. (A) Diagram of the statocyst of Octopus viewed from the side. The statocyst sac is suspended within the statocyst cavity by fibrous strands. There are two areas of receptor epithelium: a single, oval shaped macula with an attached statolith, and a crista strip that passes around the inside of the sac. such that it covers all three planes. The crista strip is divided into 9 segments, each segment carries a cupula (not shown). After Budelmann. 1980. (B) A forward and rear view of the cut open statocyst of Sepia officinalix. There are 3 maculae, arranged in 3 different planes, and the crista strip is divided into 4 segments. Anticristae and hamuli project into the cavity of the statocyst. After Budelmann. 1980. The second area of receptor epithelium consists of a narrow strip of sensory hair cells that runs around the inside of the statocyst such that it covers all three planes (Fig. 1). This strip is usually divided into segments: the crista segments, each carrying a cupula attached along the length of the crista segment. Octopods (excluding cirroc- topods) have nine crista segments, whereas decapods have four, each with its own cupula. Rotational movements of the animal cause a flow of endolymph relative to the sta- tocyst wall; this flow in turn deflects the cupula and stim- ulates the underlying hair cells. A transverse section through a crista segment (Fig. 2) reveals three main types of cells in the sensory epithelium: primary sensory hair cells, secondary sensory hair cells, and afferent neurons. This combination of primary sensory hair cells and sec- ondary sensory hair cells in a single epithelium is unique to cephalopods (Budelmann el 1987). Although the crista/cupula system responds principally to angular ac- celerations, it may also respond to linear accelerations (Budelmann and Wolff, 1973; Williamson and Budel- mann, 1985a). Because the c
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
