Last week we sent out some hearts for the conference of the Australian and New Zealand Society of Cardiac and Thoracic Surgeons (ANZSCTS). Today I’ve received a picture of one of them ready for action.
And what were they going to do with them? Replacement of the aortic valve, aortic root and ascending aorta in a workshop on the Bentall procedure.
Labbies will be pleased to note that even for heart surgeons sometimes it all comes down to skewers and sticky tape!
A drop of Nilodor in the corner of the dissection tray will mask any odour coming from the specimen during the dissection class. Don’t use more than a drop, even though it doesn’t seem like much, because the Nilodor has a scent of it’s own and some people can smell it. One drop will be enough to suppress that smell that lungs sometimes have when you are working with a pluck.
This top tip comes from Kent Bulger, HOD of Science at Sandgate District State High School. The lucky kids at this school, and some Year 7 extension students from nearby schools, have really been getting their pound of flesh out of our specimens this term with a look at just about everything we stock. All reports are that they had a great time and learned a lot.
My top tip for Nilodor is to not bother looking in pharmacies for it – you’ll find it in the supermarket with the drain cleaners.
[socialring]
Teaching science can be a tough gig. Most of the time teachers feel that they are time poor and content rich. Fitting everything required by the curriculum into a term can feel like herding cats into a bag.
Teachers know that kids want to explore science more than be taught it, but often it’s just not possible to let them take as much time as they need to really get as much learning out of an experiment as they would like.
That’s why I’m over the moon when I hear that a class has had the time to really get more bang for their buck out of one of our specimens. These photos have been sent by a labbie who bought them for a teacher wanting to teach about the brain and spinal cord. We decided that piglets would be the best option to teach this and the kids were enjoying it so much that when they were finished looking at that they flipped them over and got into the abdominal organs as well. Truly a case of learning about everything but the squeal.
The labbie says:
“They are an excellent class. It was great to see how involved they were during the prac. They really enjoyed it!
Because this dissection took place over just one period, I was requested to prepare the piglets prior to the prac, exposing the brain and the spine. … We couldn’t get hold of a Dremmel at the time so, used a hack saw to cut a cross in the skull then, cut the hole out with a pair of kitchen scissors. He also suggested that a Dremmel would be perfect for this job. It’s been put on our list for purchases prior to the budget rollover.
I then prepared the others which made it quicker and easier for the students to then get to where the brain stem and the spinal cord meet since that was their main aim for the prac.
After that the piglets were dissected even further as you saw, to locate and expose all other organs in the stomach cavity etc
All of our Science staff were extremely impressed on the quality the specimens you sent.”
Before we sent the piglets we had a bit of discussion by email about the best course of action for this prac. I still don’t have a Dremel and haven’t had a go at it, but this is what we suggested:
We believe that the best tool for opening the skull will be a small circular saw called a Dremel available at hardware stores. I was speaking to a very experienced biology teacher … that runs an extensive comparative anatomy program in his Yr 12 classes who agrees that they are the tool for the job. I am going to buy one and have a go myself. Do be careful because the skull will be slippery. You will use the Dremel to score the skull and then need a chisel and hammer to ease the skull open. There are some very good videos on YouTube that will show you what to do.
To expose the spinal cord at the back of the neck you will need to cut into the skin on either side of the spine at the base of the skull and lever the section away from the body and towards the tail. You will also be able to view the spinal cord and spinal nerves by opening the abdomen of the piglet and removing the organs to expose the spine. You will be able to see the spinal nerves entering/exiting the spinal cord cavity between the vertebrae – lift them with a probe. The vertebra will be soft enough to slice the top off with a scalpel and you will be able to view the spinal cord in-situ.
This website is an excellent resource for piglet dissections and the skull and spinal cord sections are very clearly described with photos. http://www.whitman.edu/content/virtualpig
I heard this from a lab tech from northern NSW at ConQEST. She did such a good job with the small intestine in the science classes that now she’s asked to bring it into the hospitality classes as well.
She puts the specimen into an ice cream container and lets a little bit hang over the side. Then she gets the kids to gather around and guess at what it is. They can touch it at this stage but they can’t see what it looks like in the container.
After a while they get to see it all coiled up in the container and everyone gets around to working out that it’s a small intestine. Then they start to wonder how long it is. They’ve heard that these things can be metres long, so they are allowed to start extending it out.
They pull and they pull and they pull. Eventually they are all standing holding this thing and then the labbie gets the tape measure out. It’s around 6m long.
All the while these kids have been hearing about what the purpose of the small intestine is, where it fits in the jigsaw puzzle that is your abdominal cavity and what it connects to and so on. They are fascinated by the thing and asking lots of really good questions. Before they know it these kids can spout off all sorts of fun facts about their digestive system. Teaching by stealth – I love it!
The specimen is tough enough to handle this over and over again. You will store it quite happily in the fridge for years before you need a new one. If you’re willing to you can sacrifice a little bit and make a wet mount to be viewed under the microscope. Look out for the little ‘hairs’ along the edges – those are the remnants of all the circulatory system structures that bring oxygen to the small intestine and carry fluid away from it.
This is definitely a specimen that gives you a lot of bang for your buck.
