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Journal of Comparative Physiology A

, Volume 178, Issue 5, pp 605–628 | Cite as

Processing of antennular input in the brain of the spiny lobster, Panulirus argus

II. The olfactory pathway
  • M. Schmidt
  • B. W. Ache
Original Paper

Abstract

Neurons in the olfactory deutocerebrum of the spiny lobster, Panulirus argus, were recorded intracellularly and filled with biocytin. Recorded neurons arborized in the olfactory lobe (OL), a glomerular neuropil innervated by olfactory and some presumptive mechanosensory antennular afferents. The neurons responded to chemosensory input from the lateral antennular flagellum bearing the olfactory sensilla but not the medial flagellum bearing many non-olfactory chemosensory sensilla. Many neurons received additional mechanosensory input. Thus the OL integrates specifically olfactory with mechanosensory input. OL neurons had multiglomerular arborizations restricted to one or two of the three horizontal layers of the columnar glomeruli. OL local interneurons comprised “core” neurons with tree-like neurites and terminals in the base of the glomeruli and “rim” neurons with neurites surrounding the OL and terminals in the cap/subcap. The somata of OL local interneurons lay in the medial soma cluster (100000 somata). OL projection neurons arborized in the base of the glomeruli and ascended via the olfactory glomerular tract to the lateral protocerebrum. A parallel projection pathway is constituted by projection neurons of the accessory lobe, a glomerular neuropil without afferent innervation but intimate links to the OL. The projection neuron somata constituted the lateral soma cluster (200000 somata).

Key words

Crustacean Olfaction Mechanoreception Local interneurons Projection neurons 

Abbreviations

AC

anterior cluster (cluster 6,7)

AL

accessory lobe

aMC

anterior subcluster of medial cluster (cluster 9)

AlNv

main antenna I (antennular) nerve

AlNM

antenna I (antennular) motor nerve

AllNv

main antenna II (antennal) nerve

CB

central body

CL

central layer of accessory lobe

DC

deutocerebral commissure

DCN

deutocerebral commissure neuropil

dDUMC

dorsal subcluster of dorsal unpaired median cluster (cluster 17)

dMC

dorsal subcluster of medial cluster (cluster 11)

dVPALC

dorsal subcluster of ventral paired anterolateral cluster (cluster 8) G glomerulus

IDUMC

lateral subcluster of dorsal unpaired median cluster (cluster 16)

LC

lateral cluster (cluster 10)

LF

lateral flagellum of antenna I (antennule)

LL

lateral layer of accessory lobe

MF

medial flagellum of antenna I (antennule)

ML

medial layer of accessory lobe

MPN

anterior and posterior median protocerebral neuropils

OGT

olfactory globular tract

OGTN

olfactory globular tract neuropil

OL

olfactory lobe

OLALT

olfactory lobe-accessory lobe tract

PB

protocerebral bridge

pMC

posterior subcluster of medial cluster (cluster 9)

PT

protocerebral tract

TNv

tegumentary nerve

VPMC

ventral paired medial cluster (cluster 12)

VUMC

ventral unpaired medial cluster (cluster 13)

vVPALC

ventral subcluster of ventral paired anterolateral cluster (cluster 8)

ASW

artificial sea water

M3

mixture 3

PRO

L-proline

TM

TetraMarin extract

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • M. Schmidt
    • 1
    • 2
  • B. W. Ache
    • 2
    • 3
  1. 1.Institut für Biologie, TU BerlinBerlinGermany
  2. 2.Whitney Laboratory, University of FloridaSt. AugustineUSA
  3. 3.Departments of Zoology and NeuroscienceUniversity of FloridaSt. AugustineUSA

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