Fetal Pig Lab
Category : Articles
Fetal Pig Lab
Remy Desloges, Mark Pulak
Day 1-Gender Identification and External Anatomy
1. Name: Kevin Bacon
2. Gender: Male
3. Length: Body 12.5 inches, Tail 3 inches
4. Ear Notch: single Square
5. Distinguishing marks: red spot on lower middle back
6. List of Features:
* External Nares
* Mental Gland
* Arm (Brachium)
* Forearm (Antebrachium)
* Umbilical cord
* Urogenital opening
7. Classification (taxonomy):
Today we skinned the pig which took quite a bit of time due to the fact we had to pull and cut. Our group was also very gentle when trying to pull of the skin so we took longer. For the most part we sucessfuly cut around the penis, there is a small cut in it from going to fast. The skin was fully kept as one piece so it could wrapped around later. The umbilical cord and the mental gland were not cut.
All of these muscles were identified:
* Latissumus Dorsi
* Adductor femoris
* Rectus abdominus
* Quadriceps (vastus lateralis, vastus medialis, intermedius, rectus femoris)
* Hamstrings (semitendinous, semimembranosus, biceps femoris)
The oblique muscles were identified. They were difficult at first since we had not cut deep enough and there was a layer of connecting tissue over top of the oblique muscles.
Oblique Muscles Identified:
* Internal oblique
* External oblique
Day 3-Head and Visceral Cavities
Our group did not properly cut the rib cage open. The cuts made were to deep so the pericardium was damaged and it was not on the heart when the rib cage was opened up. However it was still identified because it was stuck to the rib cage. The diaphragm was also identified; we found that it was quite large and very tough. The liver and the lobes were easy to identify. The gull bladder was quite small but still easy to identify because it was green. Our group did not break open the jaw of the pig but we identified the hard and soft palate in another group??™s pig as well as the epiglottis.
The parts identified after cutting ribs:
* Liver and its lobes
* Gall bladder
1. Parts identified:
* Masseter muscles
* Salivary duct
* Lymph nodes
* Parotid gland
* Facial nerve
Day 4-Respiratory System
The lungs of the fetal pig are not operational because it does not need to use them to supply itself with oxygen. The mother provides this through the umbilical cord. The different lobes of lungs were easy to identify. The lungs of our group were not extracted.
1. The lobes of the lungs:
* Cardiac Lobe of Right Lung
* Cardiac Lobe of Left Lung
* Intermediate Lobe of Right Lung
* Diaphragmatic Lobe of Left Lung
* Diaphragmatic Lob of Right Lung
* Apical Lobe of Right Lung
Parts of the respiratory system that were identified:
* thymus gland
Day 5-Digestive System
The digestive system was quite an easy lab. All parts were easy to identify except for the two pancreas??™ because they appeared to be just tissue aswell as the spleen which was difficult to identify because it was just a gland. Our group did not dissect the stomach however all parts of the stomach were identified from observing the stomach??™s of other groups.
1. Parts of digestive system identified:
* Spiral Colon
* Pyloric sphincter
* Cardiac sphincter
2. Our group did not extract the stomach
Lab 6-Circulatory System
Fetal pig circulation is not the same as regular circulation because the blood from the upper body, head and limbs flow straight to the caudal and cranial venae cavae. As supposed to going to the superior vena cava Our group did infact extract the heart and it was done by myself personally. The extraction of the heart was done very well, all of the parts were intact and the heart was dyed very well so all veins and arteries were easy to identify. Our group did not cut the heart down the middle though but the inside of the heart was observed from looking at other groups. The pulmonary arch on out heart was very prominent. The iliac vein and artery were very difficult to identify.
1. External anatomy of heart and circulatory system
* Pericardium membrane
* Atria and ventricles
* Pulmonary arch
* Subclavian veins and arteries
* Carotid arteries
* Cranial vena cava and caudal vena cava
* Umbilical veins and arteries
* Illianc vein and artery
2. The larger pig heart was also observed
Lab 7-Urinary and Reproductive Systems
The urinary and reproductive systems were difficult to identify because the urinary system was small and tacked behind all of the digestive system. The penis of the pig was identified aswell as the scrotum and testes. I when I was first dissecting the testis and opening up the scrotum I did not go deep enough but the second time around I opened it up completely and was able to identify the entire testis and the cauda epididymis. Since our group had a male pig we went to another group to identify the female reproductive organs. Our group did not bisect a kidney so we went to another group to see theirs.
1. Our group did not bisect a kidney, we viewed another groups, and the large kidney that was being passed around.
2. The ureter, renal artery and renal vein were all identified
3. All reproductive organs were identified including male and female.
4. The parts of the reproductive system that were identified:
* Cauda epididymis
Lab 8-Nervous system
The scalp was peeled off very easily once it was cut but scoring the skull around the brain was very difficult. Once the skull was scored it was very difficult to chip off the skull, the dura mater was not damaged when removing the skull. We could not get far enough to extract the brain but the sheep brain was observed so the different parts of it were observed.
Lab 9-Special sense organs
The sheep eye was dissected and when it was opened it was deflated on the inside and the retina was not attached to the rest of the eye it was sagging off of it. The different layers and parts of the eye were very easily identifiable due to their different colours and distinct thickness and appearance. The retina, choroid and sclera were the easiest to identify due to them being sandwiched on top of each other. The lens of the eye was infact very hard, it resembled a skittle. The eye was covered in a lot of fat and the optic nerve was very hard.
1. The pig eye was dissected properly which allowed for the inside to be easily viewed
2. The parts of the eye:
* Nictitating membrane
* Optic Nerve
3. Endocrine glands: