UK School Guide

Posts Tagged ‘CNA training’

The human arms are purpose built. They allow us to do anything with our hands, to carry weight and to even provide us with a natural form of balance and a means to steady ourselves when the human body becomes off balance. A good example of the human arms being used for balancing purposes can be seen when observing tight rope walkers; many can be seen holding their arms out to their sides straight. One of the important muscles located in the human arm which helps us with these activities is the Brachialis muscle. 

The brachialis muscle is also referred to as the brachialis anticus and has the Latin name “Musculus Brachialis”. This muscle is located in the upper human arm and is the muscle which flexes the elbow joint. The anterior surface of the humerus and more particularly the distal half of the humerus bone is the originating point of the muscle. The brachialis muscle lies just off of the biceps brachii muscle and provides the biceps brachii with assistance in flexing at the elbow. The muscle makes up a section of the floor of the cubital fossa. 

The brachialis muscle starts at the lower half of the front of the humerus close to the starting point of the deltoid muscle. The deltoid muscle is embraced by the bracialis muscle by two angular processes. The starting point of the muscle continues and extends to below within 2.5cm of the margin of the articular surface at the elbow joint. The muscle also arises from the intermuscular septa of the human arm but more so from the medial rather than the lateral. The brachioradialis and extensor carpi radialis longus muscles separate it from the lateral below. The fibers then merge with each other to form a thick tendon; this tendon is inserted into the ulna tuberosity and the depression the slides in our cna training on the outer surface of the ulnas coronoid process. 

The brachialis muscle receives it innervation by way of the musculocutaneous nerve. This nerve runs on the superficial surface of the muscle and between it and the biceps brachii muscle. A portion of the muscle is also innervated by the radial nerve which allows it to be split when certain approaches are made to the arm. The insertion of the deltoid is at the divide between the two innervations. The arterial supply to the Brachialis muscle is by the radial recurrent artery. 

The brachialis muscle is the strongest elbow flexor. Contrary to the biceps, the brachialis is not inserted on the radius and due to this cannot participate in the pronation or the supination of the human forearm nor does the pronation or supination of the forearm affect the action of the brachialis muscle. 

There are some possible variations to the brachialis muscle, the muscle may on some occasions be doubled, there may be some additional slips to the supinator, the pronator teres, the biceps brachii, the lacertus fibrosus or radius may be found although the radius is usually found on more rare occasions.