After swimming front crawl for a day, which is good for the triceps, everything became clear. The top of the triceps muscle has a strange shape because it has three "heads," or origins that connect to each other. The name comes from the Latin word tri-ceps, which means "three heads." So far, so good. The biceps is a muscle with two heads that are joined at the top by a long and short connection. The quadriceps is more complicated. It has four heads that connect at the top, but they are harder to see.
Aside from this idea finally making sense to me, it was fun to copy some of Leonardo Da Vinci's anatomical drawing style, which I have long admired. Da Vinci was perhaps the best at sketchexplanations. This collection is a great source of ideas: The Graphic Works of Leonardo da Vinci.Between the shoulder joint and the elbow joint is the upper arm. It has four muscles: the biceps brachii, brachialis, and coracobrachialis are in the front, and the teres minor is in the back (triceps brachii).
In this article, we will look at the anatomy of the upper arm muscles, including where they attach, how they are wired, and what they do.
Anterior Compartment
In the front of the upper arm, there are three muscles: the biceps brachii, the coracobrachialis, and the brachialis. The musculocutaneous nerve runs through all of them. BBC, which stands for biceps, brachialis, and coracobrachialis, is a good way to remember this.
The brachial artery sends blood to the front part of the upper arm through muscular branches.
The Biceps Brachii
The biceps brachii is a muscle that has two heads. Even though most of the muscle is in front of the humerus, it is not connected to the bone itself.
As the biceps brachii tendon goes into the forearm, it gives off a sheet of connective tissue called the bicipital aponeurosis. This connects to the deep fascia of the front of the forearm to make the roof of the cubital fossa.
The long head comes from the scapula's supraglenoid tubercle, and the short head comes from the scapula's coracoid process. Through the bicipital aponeurosis, the ends of both heads connect to the radial tuberosity and the fascia of the forearm.
Forearm supination is what the function is. It also bends the arm at the shoulder and elbow.
Musculocutaneous nerve supplies the area. The bicep reflex checks segment C6 of the spinal cord.
Coracobrachialis
The coracobrachialis muscle is deep in the arm, near the biceps brachii.
The coracoid process of the scapula is where the attachments start. The muscle goes through the axilla and connects to the deltoid tubercle on the inside of the humeral shaft.
Function: Bends the arm at the shoulder and weakly pulls the arm toward the body.
Musculocutaneous nerve supplies the area.
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