insect nervous systems and sense organs. types of neurons unipolar bipolar multipolar axon

INSECT NERVOUS SYSTEMS

AND

SENSE ORGANS

Types of Neurons

unipolar bipolar

multipolar

axon

Insect Central Nervous System

brain subesophageal ganglion

thoracic ganglia

abdominal ganglia

Insect Brain

protocerebrum

hypocerebral ganglion

recurrent nerve

subesophageal ganglion

tritocerebrum

deutocerebrum

frontal ganglion

corpus pedunculatum

optic lobe

hypocerebral ganglion

recurrent nerve

subesophageal ganglion

frontal ganglion

corpora cardiaca

corpora allata

Insect Brain - Dorsal View

ingluvial nerve

ingluvial ganglion

Stomatogastric Nervous System

hypocerebral ganglion

recurrent nerve

frontal ganglion

ingluvial nerve

ingluvial ganglion

Sensory Organs - Mechanoreceptors

seta (hair)

epithelium

trichogen cell

tormogen cell

membrane

bipolar neuron

HAIR SENSILLUM (TRICHOID SENSILLUM)

HAIR SENSILLUM (TRICHOID SENSILLUM)

Sensory Organs - Mechanoreceptors

coeloconic ampullaceous

campaniformplacoid

Sensory Organs - Mechanoreceptors

Chordotonal organs

scolopale

neuron

scolopidium

Johnston’s Organ

Johnston’s Organ

Chemoreceptors

Thin-walled Thick-walled

Chemoreceptors

Thin-walled

coeloconic

plate

basiconic

Insect Eyes

lens

crystalline cone

Semper’s cell

primary pigment cell

secondary pigment cell

retinular cell

rhabdom

axons to CNS

basement membrane

Insect Eye

Two kinds of Eye