CRAYFISH DISSECTION INTEGUMENTARYSKELETAL n n n EXOSKELETON CARAPACE

INTEGUMENTARY/SKELETAL n n n EXOSKELETON CARAPACE (EXOSKELETON THAT COVERS CEPHALOTHORAX) MOLTING

RESPIRATORY SYSTEM n PRINCIPLE OF DIFFUSION n GOING FROM AN AREA OF HIGH CONCENTRATION

CIRCULATORY SYSTEM n n FUNCTION: TO CARRY OXYGEN TO THE TISSUES AND CARRY CELLULAR

DIGESTIVE SYSTEM n n MOUTH----ESOPHAGUS-----CARDIAC STOMACH-------PYLORIC STOMACH-----INTESTINE---ANUS ENZYMES PRODUCED BY DIGESTIVE GLAND. ABSORBED BY

DIGESTIVE SYSTEM n n TAKE STOMACH OUT AND LOOK AT TEETH INSIDE THE CARDIAC

REPRODUCTIVE SYTEM n MALE? LOOK FOR TESTES UNDERNEATH THE HEART. n n BE CAREFUL

REPRODUCTIVE SYSTEM n n n DO YOU HAVE A MALE OR A FEMALE? LOOK

REPRODUCTIVE SYSTEM n n MALES TRANSFER SPERM BY SWIMMERETS TO FEMALE’S SEMINAL RECEPTACLE. FIND

REPRODUCTIVE SYSTEM n n n FEMALES HOLD SPERM ALL WINTER. RELEASE EGGS AND SPERM

EXCRETORY SYSTEM n GETTING RID OF EXCESS WATER n LIVE IN HYPOTONIC ENVIRONMENT n

NERVOUS SYSTEM n BRAIN (GANGLIA) n NERVE CORDS ENCIRCLE ESOPHAGUS n VENTRAL NERVE CORD

MUSCULAR SYSTEM n n n ADDUCTOR MUSCLES TO MOVE MANDIBLE. MUSCLES INSIDE CHELIPED FLEXOR/EXTENSOR

PARTS YOU SHOULD KNOW n n n n ANTERIOR VENTRAL CEPHALOTHORAX CARAPACE CHELIPED COMPOUND

PARTS YOU SHOULD KNOW n n n n SWIMMERETS UROPODS MAXILLAE MALE/FEMALE SEMINAL RECEPTACLE

PARTS YOU SHOULD KNOW n n n n ARTERIES PYLORIC STOMACH CARDIAC STOMACH INTESTINE

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CRAYFISH DISSECTION

INTEGUMENTARY/SKELETAL n n n EXOSKELETON CARAPACE (EXOSKELETON THAT COVERS CEPHALOTHORAX) MOLTING

RESPIRATORY SYSTEM

RESPIRATORY SYSTEM n PRINCIPLE OF DIFFUSION n GOING FROM AN AREA OF HIGH CONCENTRATION TO LOW CONCENTRATION

CIRCULATORY SYSTEM

CIRCULATORY SYSTEM n n FUNCTION: TO CARRY OXYGEN TO THE TISSUES AND CARRY CELLULAR WASTE AND CARBON DIOXIDE AWAY. OPEN CIRCULATORY SYSTEM: NO VEINS HERE!!!!!!!!!

CIRCULATORY SYSTEM

DIGESTIVE SYSTEM

DIGESTIVE SYSTEM n n MOUTH----ESOPHAGUS-----CARDIAC STOMACH-------PYLORIC STOMACH-----INTESTINE---ANUS ENZYMES PRODUCED BY DIGESTIVE GLAND. ABSORBED BY DIGESTIVE GLAND

DIGESTIVE SYSTEM n n TAKE STOMACH OUT AND LOOK AT TEETH INSIDE THE CARDIAC STOMACH. CALLED THE GASTRIC MILL

REPRODUCTIVE SYTEM n MALE? LOOK FOR TESTES UNDERNEATH THE HEART. n n BE CAREFUL THEY ARE SMALL! FEMALE? LOOK FOR OVARIES UNDERNEATH THE HEART.

REPRODUCTIVE SYSTEM n n n DO YOU HAVE A MALE OR A FEMALE? LOOK AT BASE OF 5 TH WALKING LEG FOR MALES. LOOK AT BASE OF 3 RD WALKING LEG FOR FEMALES.

REPRODUCTIVE SYSTEM n n MALES TRANSFER SPERM BY SWIMMERETS TO FEMALE’S SEMINAL RECEPTACLE. FIND THIS ANTERIOR TO FIRST PAIR OF SWIMMERETS.

REPRODUCTIVE SYSTEM n n n FEMALES HOLD SPERM ALL WINTER. RELEASE EGGS AND SPERM DURING SPRING. EXTERNAL FERTILIZATION.

REPRODUCTIVE SYSTEM

EXCRETORY SYSTEM

EXCRETORY SYSTEM n GETTING RID OF EXCESS WATER n LIVE IN HYPOTONIC ENVIRONMENT n GETTING RID OF NITROGEN WASTE n EXITS THROUGH PORE AT BASE OF ANTENNAE

NERVOUS SYSTEM

NERVOUS SYSTEM n BRAIN (GANGLIA) n NERVE CORDS ENCIRCLE ESOPHAGUS n VENTRAL NERVE CORD n GANGLIA CONTROL EACH SEGMENT

MUSCULAR SYSTEM n n n ADDUCTOR MUSCLES TO MOVE MANDIBLE. MUSCLES INSIDE CHELIPED FLEXOR/EXTENSOR MUSCLES OF ABDOMEN

MUSCULAR SYSTEM

PARTS YOU SHOULD KNOW n n n n ANTERIOR VENTRAL CEPHALOTHORAX CARAPACE CHELIPED COMPOUND EYES ANTENNULES POSTERIOR DORSAL ABDOMEN EXOSKELETON ROSTRUM ANTENNAE WALKING LEGS

PARTS YOU SHOULD KNOW n n n n SWIMMERETS UROPODS MAXILLAE MALE/FEMALE SEMINAL RECEPTACLE TESTES HEART TELSON MANDIBLE MAXILLIPEDS GILLS NAUPLIUS OVARIES OSTIA

PARTS YOU SHOULD KNOW n n n n ARTERIES PYLORIC STOMACH CARDIAC STOMACH INTESTINE DIGESTIVE GLAND GREEN GLANDS ADDUCTOR MUSCLES ABDOMINAL MUSCLES VENTRAL NERVE CORD GASTRIC MILL