Thank you for joining me again this evening for our nightly podcasts. I perform these podcasts in the hopes that you will be able to education yourself on the topics discussed so you can make better informed medical decisions regarding your health in the future. I am doctor Harrison Campbell of Restoration Health a premier sugar land chiropractors office. Previously we discussed the other muscle groups in the shoulder, but did leave out the tricep. Tonight, we will cover the tricep muscle group for the shoulder then review the shoulder as a whole.
The tricep muscle is located on the posterior portion of the arm. This muscle does not truly cross the shoulder joint, and in most cases is considered a muscle of the elbow, but the muscle body does originate near the shoulder. First we will explain the naming of the muscle then get into the function. The name triceps braccii can be broken down into tri and the ceps. As sugar land chiropractors can tell you tri means three and ceps means head.
Therefore the triceps brachii muscle means the three headed muscle of the arm. This accurately describes the triceps as it has three different muscle bellies, There is the long head of the triceps brachii, the medial head of the triceps brachii, and the lateral head of the triceps brachii. These muscle bellies run down the posterior aspect of the arm forming the triceps tendon and connected to the olecranon process of the ulna. OF these three heads, on the long long head travels up to connect with the scapula. The medial and lateral heads originate from the humerus. This is why the statement was made earlier that the muscle does not truly cross the shoulder.
This muscle group as most people know is responsible for the extension of the forearm. When the muscle contracts the olecranon is pulled as a lever extending the forearm is the physiological explanation for this motion. As sugar land chiropractors would tell you, this is not the most efficient lever, mostly due to the length of the lever, but it gets the job done for us to have mobility at the elbow.
Now enough of discussing the elbow when we are to be talking about the shoulder. To start our review we will start as we did a few night ago. The joint is a ball and socket joint. The socket is formed from the glenoid fossa, which is actually a relatively flat surface. To achieve the socket portion of this joint here is the labrum which is a tough fibrous cartilage which rings the glenoid fossa. The humerus has the ball portion of the ball and socket covered. As sugar land chiropractors stress, this ball and socket joint is highly mobile, but this mobility comes with the sacrifice of stability.
This instability gained from the increase mobility leads to a wide arrange of shoulder conditions. The most common of these conditions is the torn or blown rotator cuff. Now the rotator cuff is a collection of four muscles. Of these four muscles the supraspinatus is the most commonly injured. This muscle is responsible for the initial abduction of the arm and the external rotation of the shoulder.
The other two muscles which are responsible for the external rotation of the shoulder are the infraspinatus and the teres minor. As sugar land chiropractors can tell you these muscles are usually never injured. Instead what plagues these muscles are tender nodules called trigger points. Most people call them knots.
The final muscle in the rotator cuff is the only muscle which internally rotates the shoulder. This subscapularis muscle is also usually never injured, but again trigger points can generate pain and create shoulder problems even without a true rotator cuff injury.
The deltoid was the following muscle which we discussed. This muscle as sugar land chiropractors know is named from the Greek letter delta which when written looks like a triangle. Now there are three portions to this muscle, the anterior, middle, and posterior deltoid heads. Each of these muscles is responsible for a different shoulder motion, but the abduction of the shoulder is the quote unquote classic deltoid motion. Now due to the angle of pull, the deltoid does not initiate the abduction of the shoulder. That responsibility falls to the supraspinatus to abduct the shoulder for the first ten to twenty degrees.
Next we have the biceps brachii. Now the biceps broken down means two headed muscle of the arm. Bi meaning two, ceps meaning head, and brachii meaning arm. The short head of this muscle connect to the scapula at the corocoid process. The long head travels up through the bicep groove to the labrum and the glenoid fossa rim. The connection at the labrum when injured produces a condition which sugar land chiropractors have termed SLAP. Now SLAP stands for superior labrum tear anterior to posterior.
The biceps tendon groove where the tendon runs is enclosed by the rotator cuff tendons. This prevents the slipping of this tendon out of the groove in a condition called a slipped biceps tendon. This usually happens when the shoulder is in rotation and you can sometimes hear the thunk and physically feel the motion due to the tension on the biceps muscle.
I do hope this brief overview of the shoulder was helpful considering we have spent a few night breaking down this one joint in detail. I know tonight we briefly glossed over everything as a review, but you can go back and review with the previous podcasts as well.
Thank you for joining me again this evening for another great podcast. I hope you enjoyed the discussion on the anatomy and function of the shoulder. As always should you or someone you know require a sugar land chiropractors services or simply have more questions on what was discussed please call Restoration Health today. We would love to schedule you an appointment and get you on the path to better health today. Thank you once again for joining us. Have a good night.