Fetal Pig Lab Guide Answers
These sections have additional notes and guidance. Some things to consider before you start the lab. Do you have space with a sink? Pigs are a lot more involved than frogs and the preservatives will need to be drained and pigs rinsed. This is not a good dissection for classrooms that do not have sinks. Have your students completed the frog dissection?
The pig is more advanced, students should have a basic understanding of dissection protocols. Pigs will need to be ordered from a biological supply company. If they are not injected, the circulartory system is very difficult to view.
Generally, 1 pig for two students is a good match, but you could get away with 3-4 students per pig. Safety: Goggles are required for all dissections. Latex gloves are optional, though generally preferred. Students should always wash hands even if they wore gloves. Many chemicals will seep through the latex. I have switched to because it provides more of a barrier from harsh chemicals, but they are slightly more expensive. I take a grade on the completion of this lab guide.
But as worksheets go, you do want the students to work out the answers together and ask for help when needed. Generally I use a quick and easy method to grade it. Each section is worth 5 pts.
If its completed and looks mostly right, then they get the full 5 pts. Reduce pts if there are blanks or incorrect answers. The biggest part of their grade comes from the LAB PRACTICAL. This is where pigs are set up at stations with numbered or colored tags in the structures. Students have 1 minute at each station to identify the structure and write it on their answer sheet. This is done in complete silence with no working together.
Depending on the class, I may or may not allow them a word bank. Honors classes do not get a word bank usually unless I have an IEP or student that needs differentiation. The sheets below can be printed for the practical, they are numbered 1-50, though you don't need to use all of the blanks. Just make sure your practical contains enough stations to keep students busy. If you have 30 students, you can have 25 stations with questions, and 5 'rest stations' interspersed. Also print out the - this just lists all of the structures they need to find with a checkbox. It makes for a good reference and study guide.
Fetal Pig Dissection: External Anatomy External Anatomy 1. Determine the sex of your pig by looking for the urogenital opening. On females, this opening is located near the anus. On males, the opening is located near the umbilical cord. Check the bags and packaging, they are often labeled with the pig's sex. Make sure you mix them up within the classroom.
If your pig is female, you should also note that urogenital papilla is present near the genital opening. Males do not have urogenital papilla. Both males and females have rows of nipples, and the umbilical cord will be present in both. What sex is your pig? Make sure you are familiar with terms of reference: anterior, posterior, dorsal, ventral. In addition, you'll need to know the following terms Medial: toward the midline or middle of the body Lateral: toward the outside of the body Proximal: close to a point of reference Distal: farther from a point of reference.label the sides on the pig picture above.
On the pig picture, they should just labe the anterior, posterior, dorsal, ventral. Open the pig's mouth and locate the hard and soft palate on the roof of the mouth. Can you feel your own hard and soft palates with your tongue? Note the taste buds (also known as sensory papillae) on the side of the tongue. Gatsby prestwick study guide answers.
Fetal Pig Anatomy
Locate the esophagus at the back of the mouth. Feel the edge of the mouth for teeth. Does the fetal pig have teeth? yes Are humans born with teeth? no Locate the epiglottis, a cone-shaped structure at the back of the mouth, a flap of skin helps to close this opening when a pig swallows. The pharynx is the cavity in the back of the mouth - it is the junction for food (esophagus) and air (trachea). To find the epiglottis, you will need to make deep cuts at the edges of the mouth, I also place a lot of pressure on the jaw to break it and to get the mouth to fully open.
Students will often be too gentle opening the mouth. Gestation for the fetal pig is 112-115 days. The length of the fetal pig can give you a rough estimate of its age. 11mm - 21 days 17 mm - 35 days 2.8 cm - 49 days 4 cm - 56 days 22 cm - 100 days 30 cm - birth 5. Observe the toes of the pig. How many toes are on the feet? Do they have an odd or even number of toes?
odd toed - artiodactyls 6. Observe the eyes of the pig, carefully remove the eyelid so that you can view the eye underneath. Does it seem well developed? Do you think pigs are born with their eyes open or shut? eyes developed, they usually open their eyes within first day 7. Carefully lay the pig on one side in your dissecting pan and cut away the skin from the side of the face and upper neck to expose the masseter muscle that works the jaw, lymph nodes, and salivary glands. The salivary glands kind of look like chewing gum, and are often lost if you cut too deeply.
Salivary glands are usually in the same spot, near the cheek and jaw. Lymph nodes can be in different spots and be difficult to locate.Make sure you know the locations of all the bold words on this handout.
Identify the structures on the diagram. esophagus 2. liver 3. gall bladder 4. bile duct 5.
stomach 6. duodenum 7. pancreas 8. small intestine 9. spleen 10. cecum 11. large intestine 12.
rectum 13. umbilical arteries Identify the organ (or structure) 14. pyloric sphincter valve Opening (valve) between stomach and small intestine. gall bladder Stores bile, lies underneath the liver. cecum A branch of the large intestine, a dead end. diaphragm Separates the thoracic and abdominal cavity; aids breathing. mesentery Membrane that holds the coils of the small intestine.
duodenum The straight part of the small intestine just after the stomach. bile duct Empties bile into the duodenum from the gall bladder. rectum The last stretch of the large intestine before it exits at the anus. pancreas Bumpy structure under the stomach; makes insulin 23. bladder Lies between the two umbilical vessels. Locate the kidneys; the tubes leading from the kidneys that carry urine are the ureters. The ureters carry urine to the urinary bladder - located between the umbilical vessels.
To find the ureters, expose the kidney and wiggle it, the ureter is attached and you'll see it move. Lift the bladder to locate the urethra, the tube that carries urine out of the body. Note the vessels that attach to the kidney - these are the renal vessels Male 1. Find the scrotal sacs at the posterior end of the pig (between the legs), testis are located in each sac.
Open the scrotal sac to locate the testis. On each teste, find the coiled epididymis.
Sperm cells produces in the teste pass through the epididymis and into a tube called the vas deferens (in humans, a vasectomy involves cutting this tube). The penis can be located by cutting away the skin on the flap near the umbilical cord.
This tube-like structure eventually exits out the urogenital opening, also known as the urethra. The penis of the fetal pig is actually pretty difficult to find because it is internal (this can lead for much hilarity in the lab as students try to locate the structure. A simple technique I use to find it is to find the area just behind the urethral opening and roll this area (its also where the umbilical arteries are attached) between the thumb and forefinger. You should feel a solid tube like structure just under the skin - this is the penis. In the female pig, locate two bean shaped ovaries located just posterior to the kidneys and connected to the curly oviducts. Trace the oviducts toward the posterior to find that they merge at the uterus.
Trace the uterus to the vagina. The vagina will actually will appear as a continuation of the uterus. LABEL THE DIAGRAMS. Identify by number: Aorta 2 Dorsal Aorta 9Pulmonary Trunk 1 Common carotid 4 Left & Right Carotid 7,8 Coronary vessels 6 Left Subclavian5 Right Subclavian 10 Right Brachiocephalic 3 Right Atrium 12 Left Atrium 13 Intercostal 11 Ventricle 14 Identify the structure. pericardium Membrane over the heart.
trachea Airway from mouth to lungs 3. carotids Blood supply to head 4. ventricles Lower heart chambers 5.
dorsal aorta Blood supply to lower body 6. diaphragm Muscle to aid breathing 7. vena cava Returns blood to heart 8. aorta (or pulmonary) Large vessel at top of heart 9. larynx Used to make noises 10. coronary Arteries on heart surface. Fetal Pig - Dissection of the Lower Arteries I often do this part as an 'optional section'.
Some students will work very fast and will need something to do while others catch up. I have also offered extra credit to students who can expose these arteries to view (cleanly), which gives them extra incentive to work on it. The problem is, if you are spending time with groups that are farther behind, then you don't have a lot of time to help students with the arteries.
Giving them extra credit encourages them to try, but also requires them to work on their own. Trace the abominal aorta (also called the dorsal aorta) to the lower part of the body, careful tweezing of the tissue will reveal several places where it branches, though some of the arteries may have been cut when you removed organs of the digestive system. The hepatic artery leads to the liver. (may not be visible) 3.
The splenic artery leads to the spleen (may not be visible) 4. The renal arteries lead to the kidney. The mesenteric artery leads to the mesentery and branches into many smaller vessels. Look in the small intestine to find this artery. Trace the abominal aorta and note where it joins the umbilical arteries. You will need to cut the muscle in the leg to trace the next vessels. Use a pin to carefully tease away the surrounding muscle and tissue.
Bio Cp Fetal Pig Dissection Guide Answers
The abominal aorta splits into two large vessels that lead to each leg - the external iliac arteries will turn into the femoral arteries as they enter the leg 8. Follow the umbilical artery toward the pig, you'll find that it branches and a small artery stretches toward the posterior of the pig - this is the ilio-lumbar artery. Follow the external iliac into the leg (carefully tease away muscle),it will branch into two arteries: the femoral (toward the outside of the leg) and the deep femoral (toward the back of the leg).
Fetal Pig Lab Manual Scavenger Hunt
Dissections can be daunting- but not anymore! This thorough and engaging fetal pig activity is perfect for an upper level Biology or introductory Anatomy and Physiology course. Your students will love the detailed instructions, diagrams, photos, and worksheets included in this bundle! Addresses NGSS HS-LS1-2. This resource has recently been completely updated (as of April 2018) to include two versions: 1. Basic: Dissection instructions + explanations of structures and functions for each body system (perfect for an introduction or students needing more assistance) 2.
Advanced: Dissection instructions only (perfect for a cumulative assessment or higher level, independent students) BOTH versions work perfectly with the 5-page student lab packet including diagrams to label and comprehension questions (Answer key is included). The lab includes student observations of both external and internal anatomy of the pig: External Anatomy: Gestation & Gender- age of pig, male/female Anatomical Directions- dorsal/ventral, anterior/posterior Basic External Structures- legs, ears, snout, etc.