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: 186332
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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
!
Click
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
Cut
Slowly open the clam; continue to cut the adductor muscles if there is resistance.
Click
Student Cuts:
YouTube
SDPBSlide7
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 and
lubricated 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 palps (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 shell
Remove the upper mantle and labial palps
to expose gills and visceral mass
Cut
Lay your scissors/scalpel flat; lift the upper mantel and labial palps with a
forceps
;
slowly/carefully remove these structures
Mantle
Labial palpsSlide11
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 StructuresRemove the gills and outer layer of the visceral mass
Cut #1:
Lay your scissors/scalpel flat
; lift the gills with a
forceps;
slowly/carefully remove the gills
Click
Cut #1
Cut #2
Cut #2: Lay
your scissors/scalpel
flat and remove the outer la
y
er of the visceral mass, circular shape cut
Student Cuts:
YouTube
SDPBSlide13
Identify the following StructuresClick
Gills, mantle and labial palps 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 Slide14
Identify the following StructuresClickRemove the membrane to expose the heart
Use a
forceps
& scalpel/scissors
to remove the membrane
Heart
Student Cuts:
YouTube
SDPBSlide15
Identify the following StructuresClick
Gills, mantle, outer covering of visceral mass and l
abial palps 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)
Slide16
Dissection 101:Clam
Produced by Dakota State University and South Dakota Public Broadcasting