Musculocutaneous Nerve Innervation Anatomy Human Anatomy Kenhub
Hello, everyone! This is Matt from Kenhub, and in this tutorial, we will discuss the anatomy and innervation of the musculocutaneous nerve. The musculocutaneous nerve is a major peripheral nerve in the upper arm. It supplies the biceps brachii the brachialis and the coracobrachialis. The lateral cutaneous nerve, which supplies the skin on the lateral aspect of the forearm, arises from the musculocutaneous nerve. The musculocutaneous nerve originates in the lateral cord of the brachial plexus. It starts in the axilla and cuts through the coracobrachialis muscle near its insertion point on the humerus.
It continues anterior to the brachialis and dorsal to the biceps brachii, serving as innervation for all these muscles. The musculocutaneous nerve emerges laterally to the biceps tendon where it gives rise to the lateral cutaneous nerve, which supplies the skin on the lateral aspect of the forearm. It is of interest to know that the musculocutaneous nerve can have a varied anatomical course, and it often adheres to the median nerve and interacts with it. This tutorial is more fun than reading a textbook, right If you want more tutorials, interactive.
Autonomic vs somatic nervous system
We can think of the nervous system as split up into two other parts. There's going to be an autonomic nervous system branch. And as the name kind of sounds like, this is your automatic control. That's the involuntary parts that we talked about from above. Beside that, there's also going to be a control that we exert. And so that's going to be called the somatic nervous system. So that's something that we control, somatic nervous system. Underneath the autonomic classification, you can break this up into two other parts.
One is called the sympathetic nervous system. And we sort of alluded to that above when we were talking about the sympathetic ganglia that were part of involuntary control. In addition, we also have a parasympathetic nervous system that sort of sits in a checksandbalances position with the sympathetic nervous system. And that's how we break this up. The somatic nervous system is just the somatic nervous system. So it has just sort of one function, and it's trying to control voluntary muscle. So the neurotransmitter that we use here, which you may recall and I'll put this in parentheses.
Is acetylcholine. And we abbreviate that ACh for acetylcholine. What about the neurotransmitters that are used by the sympathetic and the parasympathetic nervous system We actually sort of know them already, at least for the sympathetic nervous system. And we can come up with it. And the way you know them is if you think about what the sympathetic nervous system does. Because I'm sure you've heard of this phrase called your fight and flight response. Fight or flight. And so that's when you're in a dire situation and your body.
Senses, uhoh, I may die at any second now. I need to do something to get out of here. And so you activate the sympathetic nervous system so that you can achieve fight or flight. You start pumping adrenaline through your body, and you get your heart to beat faster so you can pump more oxygen to your legs to help you run quicker and get away. So that's fight or flight. And so I mentioned adrenaline, which is an endocrine hormone that's secreted to help with this. But it also has a neurotransmitter friend.
That does the same thing. And so the neurotransmitter friend that I'm going to write up here, it's not adrenaline, but it's noradrenaline. Starts with an N. And another term for that is norepinephrine. I'll write it out. Norepinephrine. Or noradrenaline. And so that's the neurotransmitter that's used by the sympathetic nervous system. What about the parasympathetic nervous system Well, oddly enough it actually uses the same one that the somatic nervous system does. And the way that you can sort of differentiate this from the sympathetic nervous system is that, while the sympathetic nervous system is.
For the super, hardcore, intense moments where it's fight or flight, the parasympathetic nervous system is a little more chill. This is for rest and digest. So when you're going to sleep and you're trying to relax so your heart rate can lessen and your muscles and your heart aren't contracting as quickly. Or if you just ate a big meal and you need to digest that food, the parasympathetic nervous system will tell the stomach to churn that food up so you could digest it in your intestines as you also propel it along with the smooth muscle in there.
Roy E. Strowd, MD Neurology Wake Forest Baptist Health
I'm Roy Strowd, assistant professor of Neurology at Wake Forest Baptist Health. I primarily see patients with brain tumors. I'm a fellowshiptrained neurooncologist meaning that I see patients who have tumors that arise from the brain, the spine, or the peripheral nerves. I also see other patients with neurologic problems that may have developed from cancer or chemotherapy that they receive. For me, the patient is really the central focus to what I do. In addition to taking care of patients clinically, I also work in research. And one of the large hats that I wear is looking at new therapies that will.
Help patients with this condition either to live longer or to improve the quality of the care for the time that they have. I'm from North Carolina initially. So I was naturally drawn to an area of the country that I'm familiar with. There are a lot of institutions in North Carolina and in this region and I think specifically what drew me to Wake was my connection here I completed all my training or the vast majority of my training in med school and residency here. It's a place that has great people, an outstanding.
Median Nerve Distribution, Innervation Anatomy Human Anatomy Kenhub
Hello, again. This is Matt from Kenhub. And in this tutorial, we will discuss the distribution, innervation, and anatomy of the median nerve. The median nerve derives from the lateral and the medial cords of the brachial plexus. Initially, it travels down on the medial side of the arm along with the brachial artery. At the elbow, it will continue its course under the aponeurosis of the biceps and between the two heads of the pronator teres. Once it gives off the antebrachial interosseous branch, it will initiate its trajectory in.
The forearm between flexor digitorum profundus and the flexor digitorum superficialis muscles serving as their supply. Once the nerve reaches the rest, it continues under the flexor retinaculum in the carpal tunnel going towards the palm of the hand. There, it divides into its terminal braches which will then innervate several structures including the thenar muscles. The median nerve provides motor branches to many muscles of the upper extremity, including the pronator teres, flexor digitorum superficialis and the profundus, and the most of the thenar muscles. This tutorial is more fun than reading a text book, right If you want more tutorials, interactive.
Radial Nerve Anatomy, Innervation Distribution Human Anatomy Kenhub
Hello again, everyone. This is Matt from Kenhub! And in this short tutorial, we will discuss the anatomy, innervation, and distribution of the radial nerve. The radial nerve serves as nerve supply for some muscles of the upper arm and most of the extensors of the forearm. This nerve is the direct continuation of the posterior cord of the brachial plexus. It courses between the brachioradialis and the brachialis to the elbow where it divides into a deep branch and a superficial branch at the level of the radial head. The superficial branch uses the brachioradialis as a guiding structure to reach the wrist.
Joint and arrives at the dorsum of the hand. In contrast, the deep branch penetrates the supinator muscle and continues to the extensors of the forearm. It is important to note that the branches supplying the brachioradialis and extensor carpi radialis longus branch off before the division of the radial nerve, whereas the nerve supplying the extensor carpi radialis brevis, the posterior interosseus nerve arises just after the division. The radial muscles this nerve supplies are the brachioradialis muscle, the extensor carpi radialis longus, and the extensor carpi radialis brevis. The radial musculature supports movements.
Of the elbow, hand, and radioulnar joints. The brachioradialis is mainly responsible for the lateral contour of the elbow and forearm. The extensor carpi radialis longus and the extensor carpi radialis brevis function as the dorsal extensors and the radial abductors of the wrist joint. They also contribute to a strong fist closure by stretching the flexor muscles of the hand and fingers prior to contraction. This tutorial is more fun than reading a text book, right If you want more tutorials, interactive quizzes, articles, and an atlas of human anatomy, click on the Take me to Kenhub button.
A part of the cervical spine or neck that is important is the uncovertebral joint and that is this little triangular outcropping of bone right here this point as we get older starts to enlarge and push against this point and that creates a spur the spur can live right in this area and of course that spur is right where the nerve root exits and therefore that spur can compress a nerve root and it's quite a common problem for patients with neck shoulder and arm pain these are actual cervical vertebra.
Gabapentin To Treat Adults With Nerve Pain Caused by Shingles Overview
Gabapentin is a prescription medication used to treat adults with nerve pain caused by shingles. Shingles is a painful rash that is caused by the varicellazoster virus, the virus that also causes chickenpox. Gabapentin is also used in combination with other medications to treat partial seizures. Gabapentin belongs to a group of drugs called anticonvulsants, which help treat seizures by decreasing abnormal excitement in the brain. It also works by altering the way the body senses pain. This medication comes in tablet, capsule, and oral solution forms. It is taken up to three times a day, with or without food. The capsules.
The Nervous System, Part 1 Crash Course AP 8
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