Download B20 Fetal Pig Dissection

B20 Fetal Pig Dissection
What’s the Story?
Form and function (that’s why the parts are so recognizable), interactions,
amazing adaptations!
Follow the directions on pg. 762 – 767.
4 Parts to dissection
1) External features, age and sex
2) Digestive/Excretory System
3) Circulatory System
4) Respiratory System
Dissection technique
• Keep tips of cutting instruments UP at all times. Open up abdominal cavity BELOW diaphragm.
• Have one person read directions, others cut, measure, make labels.
– share all jobs.
• At the end of the dissection, if you have any nicely dissected organs or systems, give them to me
for the lab practical, otherwise, throw away any parts you no longer need in the special garbage
can.
• Label your pig with your own design index card symbol tied to your pig, and replace it in the
dissection bucket til the next period.
Safety
• Make cuts away from your body.
• Pigs are preserved in a chemical – limit your exposure by wearing gloves at all times and wash
your hands with soap at end of dissection.
Assignment: Dissect your fetal pig using the instructions in your book pg. 762 – 767. Fill out the
Tables and Analysis questions below with detail.
Assessment:
1) I want to see the digestive system nicely dissected, laid out and correctly labeled by each
group. I will ask each of you what the function of parts are, and how their form (structure)
is efficient for their function. Make sure you take a picture of these so if I can’t get to your
group I can assess your group from the pictures and individually assess you later.
2) do the same for the circulatory system (heart and main blood vessels attached to it) and the
respiratory system.
3) Lab practical test (asking questions such as: ID labeled organs, tell their functions, what system
are they part of , what they are connected to….. on a dissected fetal pig) on the day of the open
notes (no computers) test on C9 and C 10 - excretion and muscles.
Table 1: LOCATION/POSITION TERMS
pg. 762/internet
Term
Definition
dorsal
ventral
medial
lateral
proximal
distal
posterior
anterior
Analysis: Draw your pig and indicate the location/position terms.
Table 2: EXTERNAL FEATURES, AGE AND SEX
pg. 762 – 763/internet
1. What is your estimate of the gestational age of your fetal pig?
Structure
Location
Function
How does appearance of structure
relate to its function: give as much
detail as possible, including size,
texture, external and internal
structure
ear
eye
nose
tongue
wrist
digit
shoulder
elbow
nipples
umbilical cord
hip
knee
ankle
anus
urogenital
opening
scrotal sac
genital papilla
Table 3: DIGESTIVE/EXCRETORY SYSTEM
Structure
Location
Function
pg. 763 - 765
How does appearance of structure
relate to its function: give as much
detail as possible, including size,
texture, external AND internal
structure
teeth
tongue
epiglottis
hard palate
soft palate
nasopharynx
peritoneum (2
mesenteries)
liver
gall bladder and
bile duct
spleen
esophagus
stomach
pancreas
small intestine
a) duodenum
b) ileum
c) jejunum
large intestine
1) colon
2) rectum
Urinary bladder
Analysis Question: Trace the path of food from the mouth to the rectum. Identify the major
steps in the digestive process that take place along the way.
Table 4: Circulatory System pg. 765 - 766
Structure
Location
Function
How does appearance of structure
relate to its function: give as much
detail as possible, including size,
texture, external and internal
structure
pericardium
heart
arteries
veins
aorta
Superior vena
cava
Inferior vena
cava
Pulmonary
trunk and right
and left
pulmonary
arteries
Right and left
pulmonary veins
Right atrium
Right ventricle
Left atrium
Left ventricle
Tricuspid valve
Bicuspid valve
Pulmonary
semilunar
valves
Aortic semilunar
valves
septum
Analysis Question: Trace the path of blood from the body through the heart and back to the
body. Identify the major steps in the circulatory process that take place along the way.
Table 5: Respiratory System pg. 766 - 767
Structure
Location
Function
How does appearance of structure
relate to its function: give as much
detail as possible, including size,
texture, external and internal
structure
Pleural
membrane
Right lung
Left lung
larynx
trachea
glottis
epiglottis
pharynx
Rib cage
Intercostal
muscles
diaphragm
bronchi
Analysis Questions: Trace the path of air from the mouth to the alveoli. Identify the major
steps in the respiratory process that take place along the way.