Do you know about this little muscle in your shoulder? (Coracobrachialis Muscle) Let's talk!

Have you ever thought about a little pain or tightness in the upper part of your arm, near your shoulder or armpit? Sometimes we may not pay much attention to it. However, even the smallest part of our body can sometimes have a big impact. So, today we are going to talk about a small muscle on the upper part of our arm, near the shoulder, that is not very well known, but can sometimes be a nuisance. This is called the coracobrachialis muscle.

What is the Coracobrachialis muscle?

Simply put, your coracobrachialis is a small muscle that runs along the front of your upper arm. It starts at your shoulder joint, specifically at a small bony protrusion called the coracoid process on your shoulder blade (scapula). The "coraco-" part refers to that connection. Then this muscle comes up and attaches to your upper arm bone (humerus), right in the middle, near the armpit. The "brachialis" part refers to the fact that it attaches to your upper arm.

Think about it, this is not like the other big, tough muscles in your arm (for example, the biceps muscle). It's a bit hidden. And it doesn't contribute much to the main functions of your arm. However, due to certain activities, this coracobrachialis muscle can become tight and tight. That's when it can manifest as shoulder pain or arm pain . Sometimes it's hard to pinpoint the cause of the pain. Because the nerve involved – the musculocutaneous nerve – runs from your shoulder down your arm, the pain can be referred from one place to another (referred pain).

What happens to this coracobrachialis muscle? / What are its functions?

Actually, from a functional perspective, this is not a muscle that does a lot of work. However, it does provide a few small helpings. These are:

• Flexion: Like when you extend your hand forward to shake someone's hand, or when you reach out to receive something someone is giving you.
• Adduction: It's like you're spreading your arms out to the sides like an "airplane", then lowering your arms back down to the sides.
• Internal rotation: When you turn your arms inward, as if you were hugging yourself.
• Shoulder stability: Helps keep your upper arm bone in place within your shoulder joint, especially when you rotate your arm.

Imagine, if there is any damage to this coracobrachialis muscle, you will not be able to do the things mentioned above. However, they may be a little difficult. You may feel a little weakness, pain, and a little instability when moving your right arm.

You may experience these difficulties, especially in tasks like:

• When lifting a heavy object and holding it close to the body (e.g., a school bag, a small baby).
• When pushing a heavy door, doing push-ups, or swimming breaststroke.
• When doing something with your arm across your body (e.g., when putting on your seat belt in a car, or tying your shoelaces on the other side).
• When playing sports that involve overhead throwing or pulling motions (e.g. baseball, football, archery).

Where is the coracobrachialis muscle located?

If you go in front of the mirror and squeeze your biceps, you might be able to see this coracobrachialis muscle. This is a muscle that runs from the front of your shoulder joint, just above your armpit, down to your forearm. If you put two of your fingers on your collarbone and move them toward your shoulder, you'll find that bony bump I mentioned earlier called the coracoid process. That's where this muscle attaches. If you squeeze there, you should feel some sensation from the muscle.

From here, the muscle runs along the inside of your upper arm until it's right in the middle. Your chest muscle (Pectoralis Major) runs above this, from your chest across the front of your shoulder to attach to your upper arm. The coracobrachialis muscle is underneath it, tucked into a groove between your biceps and triceps muscles. If you put your fingers in there and press your arm against your body, you might feel it pop out.

What diseases can affect this muscle?

Any common muscle strain can affect the coracobrachialis muscle. However, it is less common. Because it is not close to the surface of the body, it is not as easily injured as other muscles. Also, we do not use it as much.

However, athletes and those who perform repetitive tasks are more likely to develop problems due to overuse of the coracobrachialis muscle. The most common conditions that can affect this muscle are:

• Repetitive Strain Injury (RSI): When a muscle is used continuously without proper rest, it can become fatigued. When a muscle is fatigued in this way, if it is not given a chance to recover, it can become stiff, develop into a lump, and even calcify, forming stones.
• Myofascial Pain Syndrome: When a muscle is constantly strained, chronic inflammation can occur in the fascia and surrounding connective tissue. This can lead to chronic pain around a tight spot in the muscle called a trigger point.
• Nerve Entrapment: This is a rare occurrence. However, during excessive exercise, the coracobrachialis muscle can sometimes enlarge and press on the musculocutaneous nerve that runs through it. When a nerve is entrapped, numbness, tingling, or pain can occur along that nerve, which can extend down the entire arm.

How do you know for sure that this pain is coming from the coracobrachialis muscle?

Actually, it can be a little difficult to identify pain in the coracobrachialis muscle. Especially if you don't know much about this muscle or where it is located. Another thing is, as I mentioned before, the pain caused by this muscle can be felt anywhere along the musculocutaneous nerve, from the shoulder to the forearm (referred pain).

So, if you have unexplained shoulder or arm pain , you can look for the Coracobrachialis muscle and see if it is tight or has any lumps.

• If it hurts when you squeeze the muscle, or if it makes your shoulder/arm pain worse, it's likely the cause of your pain.
• If you have a tight spot in your muscle that feels like a knot and hurts when you squeeze it, that's what's called a Myofascial Trigger Point. Once you release the knot, the pain should subside.
• If the musculocutaneous nerve is pinched, symptoms may include numbness on the inside of the forearm or weakness when bending the elbow.

What to do for pain in the coracobrachialis muscle?

Okay, let's say you understand that this pain is caused by the coracobrachialis muscle. So what can you do?

• Rest: First, if your muscles are sore, the best thing to do is to rest them . Stop doing the activity that's causing the pain for a while.
• Massage: If the muscle feels tight and constricted, gentle massage can provide relief.
• Medical advice: It is best to consult a Sports Medicine Physician or Physical Therapist . They can examine you properly and provide the necessary treatment.
• Trigger Point Therapy: If you have myofascial pain, you may benefit from treatments such as Trigger Point Therapy, also known as Myofascial Release.
• For a pinched nerve: If you have symptoms of a pinched nerve (numbness, weakness), definitely see a doctor .

Remember, the coracobrachialis is a small, somewhat hidden muscle located in the front of your upper arm, near your armpit. You may not even notice it until you overuse it. However, if you do a lot of push-ups, hang from the rings at the gym, or lift heavy bags with your arms down, this muscle can start to get sore and tight. So, if you have shoulder pain or arm pain that you can't find the cause, remember that it could be your coracobrachialis.

Finally, things to remember

In short, the coracobrachialis is a small muscle located in our shoulder and arm that we don't think about much in our daily lives, but it can be important.

• Even though this is a small muscle, it can sometimes cause pain in the shoulder and arm.
• This muscle can be injured, especially due to repetitive activities and heavy lifting .
• If you have unexplained shoulder or arm pain, think about this muscle.
• Rest, gentle massage, and seeking medical advice if necessary are the best remedies for conditions like this.

So, take a little care of this little friend in your body. Then you will be able to carry on with your work without unnecessary pain!

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