Grasshopper Dissection

External Sketch

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3

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1. antennae: jointed for movement, sense of smell

2. compound eye: specialized for detection of movement

3. simple eye: detection of light vs. dark

4. mandible: mouthpart for grinding and cutting

5. maxilla: mouthpart for food manipulation

6. palps: mouthparts for tasting and sensing

7. forewing: tough wing for protection, some flight

8. hindwing: more membranous, primary flight structures

9. ovipositor: (female) deposits eggs

10. spiracle: opening from tracheole to outside for gas exchange

11. metameres: segments of body

7

External: Legs

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3 45

6

78

1. walking legs: jointed for mobility

2. jumping leg: jointed for mobility, large for jumping

3. coxa: attachment structure of leg to body

4. trochanter: attachment from coxa to femur

5. femur: longest leg segment

6. tibia: middle leg segment

7. tarsus: “foot” leg segment

8. spines: defensive structures on legs

9. claws: provide gripping ability

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Internal Sketch

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47 3289

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1112 6 5 1. brain

2. nerve cord: transmission of nerve signals

3. ganglia: small nerve clusters along nerve

cord, each segment controlled by its own

ganglia

4. mouth: entry into digestive system

5. crop: temporary storage of food

6. gizzard: mechanical digestion of food

7. gastric caeca: production of digestion

enzymes which are secreted into the gizzard

8. intestine: chemical digestion and absorption

of nutrients

9. malpighian tubules: filtration of wastes;

analogous to kidneys

10. spiracle: opening for exchange of gases

11. air sac: increase respiratory efficiency by

increasing surface area for gas exchange

12. tracheal tubes: distribution and exchange of

gases throughout the body

Reproductive Sketch

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1. testes: sperm production

2. sperm duct: transmission of sperm

3. seminal vesicle: secretions added to sperm

4. penis: exit of semen for reproduction

5. ovary: egg production

6. seminal receptacle: temporary storage of sperm

from male after mating

7. accessory gland: production of secretions which

attach eggs to surfaces

8. vagina: entry of sperm and connected to

seminal vesicle where sperm will be stored

External Specimen

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4 5

1

6 1. compound eye

2. antennae

3. walking leg

4. walking leg

5. jumping leg

6. spines

7. metameres (segments)

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External Leg and Respiratory

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43

21

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1. coxa

2. trochanter

3. femur

4. tibia

5. tarsus

6. claw

7. spines

External Specimen

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2

3

1. forewing

2. hind wing

3. tympanic membrane: sound reception

Internal Specimen1

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3

1. eggs

2. muscle fibers

3. tympanic membrane

Respiratory System

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1

1. spiracles

2. air sac

3. tracheal tubules

Digestive System5

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3

21

1. mandible

2. maxilla

3. palps

4. crop

5. gizzard

6. gastric caeca

7. intestine

8. malpighian tubules

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8

Nervous System

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3

1. ventral nerve cord

2. ganglia

3. brain