Woke up ok today due to going to bed super early last night, and still managed to feel run down by the end of the first lecture. One of my friends from last year even mentioned that I sounded terrible when I saw her between classes. So I guess that means that I’m officially sick, time to jack up the amount of tea and vitamins and pray it goes away without getting worse.
I made it through lectures with a little help from the on campus coffee shop, and even managed to study between second and third lecture in the one hour gap they so graciously allotted us. All of that study even helped me to be somewhat prepared for the lab in the afternoon. Though it did not help me to be awake during the lunch break.
In lab today we cut through a number of the muscles we looked at last week. The latissimus dorsi, pectoralis profundus, pectoralis superficialis, trapezius, and the brachiocephalicus all got the cut so that we could see underlying muscles, blood vessels, and nerves. We pulled the leg away from the body (abducted) and found the brachial plexus (a bunch of nerves branching out from the body to the forelimb). We cut through quite a bit of connective tissue and found several important nerves (which look an awful lot like connective tissue in preserved specimens). The suprascapular nerve comes from the sixth and seventh cervical vertebrae and travel down to the brachial plexus and then around the neck of the scapula to the lateral side where it innervates muscle groups on both sides of the spine of the scapula. The subscapular nerve comes from the seventh cervical vertebra, follows a similar path, but from the brachial plexus only has to go to the medial surface of the scapula (much shorter distance). The axillary nerve comes from the eighth cervical vertebra, travels ventrally to the brachial plexus and then to the flexion angle (the inside of the angle) of the shoulder joint to supply the teres major, teres minor, and deltoideus. The radial nerve (the largest bundle of nerves) comes from the seventh and eighth cervical vertebrae as well as the first thorasic vertebrae and travels to the brachial plexus and then to the humerus where it innervates just about everything (or so it seems to this budding anatomist). The musculocutaneous nerve starts at the seventh and eighth cervical vertebrae and travels to the brachial plexus, then to the brachiocephalicus and the biceps, then under the biceps brachii to supply the brachialis (hence the musculo part of its name) before moving further down the leg (distal) where it innervates the skin (hence the cutaneous part of the name). The last two nerves (I know, I was excited too) run parallel and are held together by a thin layer of connective tissue so that they almost look like one nerve. These are the median and ulnar nerves. The median nerve starts at the eighth cervical vertebra and first thorasic vertebra, goes to the brachial plexus, then runs along the inside (medial) of the humerus and supplies most of the structures in the lower forelimb. The ulnar nerve follows a similar path, starting at the eighth cervical vertebra and first and second thorasic vertebrae, going to the brachial plexus, and then continuing along the medial aspect of the humerus where it continues to the lower forelimb where it also supplies most of the muscles.
After finding all of the delightful nerves, the book instructed us to essentially CUT OFF the leg of our dog. We opted out of that part, so that we can review at the beginning of next week. If we really need the leg removed we can amputate later, for now we are keeping it right where it is.
After lab I was scheduled to meet up with my bestie to go get Chinese takeaways from our favourite takeaway place. He ended up in his lab half an hour longer than he was supposed to, so we were pretty late getting dinner. Fried rice is amazing when I’m sick though. My stomach always loves it, and it doesn’t matter how stuffed my nose is because it always tastes amazing.
Now I really need to get to bed so that I don’t get worse.