Invertebrate Histology by LaDouceur Elise E. B.;

Author:LaDouceur, Elise E. B.; [LaDouceur, Elise E.B.]
Language: eng
Format: epub
Publisher: John Wiley & Sons, Incorporated
Published: 2021-01-28T00:00:00+00:00

Figure 5.41 Brain of an unspecified cephalopod revealing the brain surrounding the esophagus (E). The neuropile (N) is eosinophilic with few cells. The neurons (arrows) are arranged in both lamina (layers; horizontal arrows) and aggregates (vertical arrow). 40×. HE.

5.3.7.1 Central Nervous System

The brain is protected within a cartilaginous case located between the eyes and forms a ring around the esophagus (Figure 5.41). Large, oval or reniform optic lobes are present on either side of the brain separated by the optic tract (Figure 5.42). There is a distinct layered cortex and a medulla containing large multipolar neurons. The cortical layers resemble the organization of deeper layers of the vertebrate retina (Figure 5.42 inset). Neuropile is a pale, acellular tissue composed of axonal processes. Basophilic neurons are found peripherally around the neuropile (Figure 5.43). Ganglia are composed of neuronal cell bodies and are arranged in both lamina (i.e., layers) and aggregates, depending on the region of the brain. The optic glands are located on the upper posterior edge of the optic tracts and composed of a well‐vascularized, uniform mass of cells with no obvious formation of epithelia or vesicles (Budelmann et al. 1997) (Figure 5.43).

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