Group Members
Per
Shark Dissection Pre-lab
Instructions
Using the information packets at your table, answer the following questions and label the accompanying
diagrams.
Part A: External Anatomy
1. What is the purpose of the lateral line?
2. Label the following on Figure 1-1
Anterior Dorsal Fin
Caudal Fin
Posterior Dorsal Fin
Pectoral Fin
Pelvic Fin
Figure 1-1 External anatomy of a dogfish shark (Dorsal view)
3. What type of tail does the dogfish shark have?
4. Describe the eyes of dogfish shark.
5. Label the following on Figure 1-2
Mouth
Pectoral fin
Cloacal Opening
Nostril
Gill Slits
Pelvic Fin
Clasper
Caudal Fin
Figure 1-2 External anatomy of a dogfish shark (ventral view)
6. What are spiracles?
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7. Label the following on Figures 1-3 & 1-4
Eye
Gill Slits
Ampullae of Lorenzini
Spiracle
Nostrils
Mouth
Figure 1-3 External Anatomy of a dogfish shark (left anterior)
Figure 1-4 Anterior View (dorsal side)
8. List the functions of the following parts of a dogfish shark:
Pectoral fins
Pelvic fins
Nostrils
Ampullae of Lorenzini
Cloacal opening
Claspers
9. Label the following parts on Figures 1-4 and 1-5
Pelvic Fin
Spine
Clasper
Cloacal opening (both on male and female)
Figure 1-4 External anatomy (female)
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Figure 1-5 External anatomy (male)
Part B: Internal Anatomy
1. Describe the following parts of a shark’s digestive system including its function
Peritoneum
Mesentery
Liver
Gall bladder
Esophagus
Stomach
Duodenum
Pancreas
Spleen
Valvular intestine
Spiral valve
Cloaca
Colon
Rectal gland
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2. Label the following parts on the Figure 2-1
Stomach
Pancreas
Duodenum
Liver
Spleen
Vulvular Intestine
Figure 2-1 Internal anatomy of a dogfish shark (digestive system)
3. Label the following parts on the Figure 2-2
Stomach
Pancreas
Duodenum
Liver
Spleen
Vulvular Intestine
Figure 2-2 Internal Anatomy: Digestive system
4. Label the following parts on the Figure 2-3
Duodenum
Spiral Valve
Cloaca
Vulvular Intestine
Rectal Gland
Colon
Figure 2-3 Internal Anatomy: Digestive system
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Esophagus
Pylorus
Rugae
5. Describe the following parts of the respiratory system of a shark including its function
Gills
Oral cavity
Tongue
6. Label the following parts of a shark’s respiratory system on Figure 3-1
Gill archers
Internal Gill Slits
Internal Spiracle
Gill pouch
Figure 3-1 Internal anatomy: Respiratory System
7. Describe how fish blood becomes oxygenated.
8. What is the function of a shark’s urinary and genital systems?
9. Why area shark’s urinary and genital systems considered a single system?
10. How are male kidneys different from female kidneys in sharks?
11. Describe the following parts of the urogenital system of a shark including its function
Kidneys
Testes
Efferent ductules
Ductus deferens
Ovaries
Claspers
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12. Label the following parts of a shark’s urogenital system on Figure 4-1
Oviduct
Cloaca
Stomach
Uterus
Testis
Kidney
Figure 4-1 Internal Anatomy: Urogenital system
13. How is internal fertilization achieved in sharks?
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