External and Internal Anatomy

Veterinary Entomology 208 Spring 2010

 Today

we will be using the grasshopper as a model insect:

1. Work

in pairs 2. Read through the handout on external anatomy 3. DO NOT CUT INTO THE GRASSHOPPER

antenna compound eye ocelli

labrum

hypopharynx filler

mandible

maxilla labium

dorsal

notum posterior

pleuron sternum

ventral

anterior

 thorax head thorax

divided into

• prothorax • mesothorax • Metathorax  1st

pair of legs =

prothoracic legs abdomen

 1st

pair of wings =

mesothoracic wings  2nd

pair of wings =

metathoracic wings

MALE – CLASPERS (CERCI)

FEMALE – OVIPOSITOR

1.

Know the underlined structures

2.

Pull off the mouthparts to identify them

3.

Look at the demonstration material

4.

Make sure you are familiar with both male and female external anatomy

1.

Read through the handout on internal anatomy

2.

We will go through the procedure for dissection and what structures will be visible

3.

DON’T CUT THEM YET

 The

first thing you will see is the reproductive system on the dorsal surface of the grasshopper • Male – testes • Female – ovaries

 Make  Look

sure you are familiar with both

at the demo

foregut

midgut

hindgut

anus

crop

gizzard

gastric caecae

stomach

malpighian tubules

ileum

colon

connective

1. 2. 3.

4. 5. 6.

7. 8.

Cut off the head Cut off the legs Watch out for the esophagus and cut down both sides of the grasshopper Gently pull the back off Observe the reproductive system lying over the digestive system Observe the digestive system Under the digestive system is the delicate nervous system Clean up

Mesothoracic wing antennae

-

Metathoracic wing