ENVS 2210 Chapter Notes -Suboesophageal Ganglion, Midbrain, Photoreceptor Cell

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Published on 17 Apr 2013
School
University of Guelph
Department
Environmental Sciences
Course
ENVS 2210
ENVS Unit 03 Pages 49-69
Bees’ Innards: Internal Organs for an Active Bee
- Similarities and diffs btwn Central Nervous System of bees and humans
o Insect brain shaped like malformed donut , gut runs through the hole
Maj lobe called “brain proper”
Nerves from brain to sensory parts of head
Segmental ganglia coordinate reflexes involved in fligh o rfight
- Respiratory system unique to insects
o Spiracles allow air to be pumped into and out of body
o Air enters large balloon-like sac before conducted through body in smaller
complex tubes (trachea)
o Whole body even abdomen helps pump air
o Repiratory wastes like carbon dioxide and water incorporated into
haemolymph
- Reproductive system is sketchy
o Repro organs for female bees similar to most animals : ovaries, oviducts,
vagina, associated glands BUT queen honeybees have spermatheca
where she keeps supply of sperm for several years of laying eggs
Mature fertile queen will produce over 1000 eggs a day
Ovaries SO large she‟s unable to fly
o Drones repro organ is most bizarre in world, has standard: testes, vas, and
associated glands but structure is unusual form
Penis is like alien empire, it literally explodes (audibly) when
drone mates w/ a queen
“When he is to become a „pop‟ he pops”
Nervous System from Stem to Stern: Form and Function
- CNS in insects has brain and main nerve trunks that extend the length of the body
o Main nerve trunks are ventral, NOT dorsal like human bodies, paired
NOT single like in humans, and interconnected w/ ganglia
- Insect brain
o Cerebrum (brain proper), and suboesophageal ganglion ehich resides in
top of head
o Brain of honeynbees contains 850 000 cells
o Cerebral mass comprise three area: protocerebrum, deutocerebrum, and
tritocerebrum
o Whole brain is bilaterally symmertrical
o Mushroom bodies (corpora pedunculata) resemble mushrooms,
integrate sensory info as it pours from general nervous system (eyes, oceli,
antennae, mouth, limbs, body surface)
Centres of mem and learning and subtly change as adult bees age
and change behaviours accordingly
o Bees have left and right hemi just like us, have central body (like corpius
collosum) that integrates info from either hemi
o Peripheral parts of brain also bilateral, largest parts are optic lobes that
include compound eyes (can be considered par tof the brain b/c brain
reaches the retinal cella)
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Document Summary

Bees" innards: internal organs for an active bee. Similarities and diffs btwn central nervous system of bees and humans: insect brain shaped like malformed donut , gut runs through the hole. Nerves from brain to sensory parts of head. Segmental ganglia coordinate reflexes involved in fligh o rfight. Reproductive system is sketchy: repro organs for female bees similar to most animals : ovaries, oviducts, vagina, associated glands but queen honeybees have spermatheca where she keeps supply of sperm for several years of laying eggs. Mature fertile queen will produce over 1000 eggs a day. Ovaries so large she s unable to fly: drones repro organ is most bizarre in world, has standard: testes, vas, and associated glands but structure is unusual form. Penis is like alien empire, it literally explodes (audibly) when drone mates w/ a queen. When he is to become a pop he pops . Nervous system from stem to stern: form and function.

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