the Dissection Video and Accompanying PowerPoint Presentation Reduce the number of specimens used by a class Increase the quality of the dissection for the students Review opportunity increasing the learning experience for the students ID: 460884
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Slide1
Reasons to Use the Dissection Video and Accompanying PowerPoint Presentation Reduce the number of specimens used by a class Increase the quality of the dissection for the students Review opportunity, increasing the learning experience for the studentsStudent unable to dissect due to pregnancy or hypersensitivity to the preservatives Student chooses not to dissect due to ethical/moral reasons
Dissection 101:
ClickSlide2
Dissection 101:As an educator you are responsible for the implementation of the dissection activity described in the video and PowerPoint. You must have safety procedures and rules established for your classroom and make sure all of the students follow the rules to ensure a safe environment. South Dakota Public Broadcasting and Dakota State University cannot in any way be responsible or liable for any injury as a result of performing the described dissection. Complete the dissection if you feel it is appropriate and safe for your individual class. Have fun and stay safe
!
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Safety Considerations
Age
appropriate activity for the children in your care
Material
Safety Data Sheet (MSDS) available for accident reference
Poison
control number/phone readily available
Latex
free gloves, eye protection and apron/lab coat
Eyewash
station, shower and sink
Sharp
instruments (cut away from self and others)
Sharps
and specimen(s) disposal
Encourage
students to report all accidents
Basic
science laboratory rules (strictly enforced) Slide3
Click
Dissection 101:
ClamSlide4
ClickDissection 101:Clam
Exterior of the Clam
Umbo (location): Shell originates from here (oldest section of the shell)
Dorsal
(hinge side)
Anterior
(closer to umbo)
Posterior
(
greater distance from umbo)
Ventral
(foot side - movement)
Shell produced by mantel in a series of rings, similar to the rings of a tree – does not
indicate age
Wood inserted during preserving process to keep the clam open for dissection
OrientationSlide5
ClickExterior of the Clam
Umbo
Hinge
Bivalve
(
2 shells)
Dorsal
(top view)Slide6
Dissection 101:ClamCut both adductor muscles on either side of the hinge; do not cut
through the middle of the clam (dorsal side: posterior and anterior)
Always cut away from
your hands and fingers
Slowly open the
clam;
continue to cut the adductor muscles if there is
resistance.
ClickSlide7
Dissection 101:ClamClick
Many times one of the mantles will rip when the clam is pulled apart.
This is not
part of the
clam
. It is an
extra piece
of wood
accidentally left in the
clam during preserving
process
.Slide8
Identify the following StructuresClick
Adductor muscles (2)
relaxed – clam opens
c
ontracted – clam closesSlide9
Identify the following StructuresMantle
Produces shell and
provides protective andlubricated surface for
the body structures
(torn)
Click
Pallial line
Location on shell
where
mantle
attaches
Nacre/Mother of pearl Iridescent layer of the shell, pearls form here Slide10
Identify the following StructuresClickLabial pulps (4)
Two on each side of the mouth, used to sort food and
move it toward the mouth
Muscular Foot
Used for movement, appears shrunken in preserved clam
Gills (respiratory)
Used to remove oxygen from the water
Mantle
Produces the shell
Mantle
Produces the shellSlide11
Identify the following StructuresClickGills have feather-
like appearance, usually two on each side
Foot
Visceral mass
T
hick area above foot, digestive glands, intestines and gonads located here
Mantle
Visceral mass
Foot
Top ViewSlide12
Identify the following StructuresClick
Gills, mantle and labial pulps removed
Visceral mass with outer layer removed
Digestive glands
(usually green) produces enzymes
to digest
food
Gonads
(
usually yellowish/white) reproductive function
T
ube-like intestines
wind
through the visceral mass Slide13
Identify the following StructuresClick
Gills, mantle, outer covering of visceral
mass and
labial pulps removed
Heart (exposed by removing
protective membrane)
Each specimen
may appear a little different, damaged
adductor muscle shown here (could indicate some type of disease or condition that attacked
the muscle)
Slide14
Dissection 101:Clam
Produced by Dakota State University and South Dakota Public Broadcasting