Arms are the most functional muscle of the human body, involved in all kinds of pushing/ pulling movements. The arm group of muscles, apart from being small, is immensely involved in all types of compound movements including the shoulder joint. All the movements which contain the pulling action involve the biceps brachii to a huge extent. Similarly, movements related to pushing involve the triceps brachii. Also, the forearm gets punished as your grip is challenged to the maximum while trying to hold on to the weights tightly.
BICEPS BRACHII -
The biceps brachii, commonly known as the biceps, is a two-headed muscle on the upper arm between the shoulder and the elbow. It derives its name from a Latin phrase which when translated means “two-headed muscle of the arm” due to the fact that the biceps muscle has two separate heads. The biceps brachii muscle (biceps) is a large, thick muscle of the upper arm. Unlike other muscles found on the front of the human body, the biceps are responsible for pulling movements as opposed to pushing. The two heads of biceps brachii are the long head and the short head.
Long head - It originates at the supraglenoid tubercle above the socket of the scapula and inserts into the posterior border of bicipital tuberosity of radius and bicipital aponeurosis to deep fascia and subcutaneous ulna.
Short head - It originates at the coracoid process of the scapula and inserts into the posterior border of bicipital tuberosity of radius and bicipital aponeurosis to deep fascia and subcutaneous ulna. The other muscles that help biceps brachii to flex at the elbow are the brachioradialis and brachialis.
TRICEPS BRACHII -
The Triceps Brachii muscles are located on the back of the humerus and are more commonly referred to as the triceps. The triceps are the extensors at the elbow joint. They are responsible for straightening the arms and assist in all pushing movements. As the name suggests, the triceps are made up of three heads – the inner long head, lateral head, and medial head. When fully developed, triceps take on a horse shoe shape.
Inner long head- It originates at the infraglenoid tubercle of the scapula and inserts into proximal end of olecranon process of ulna and fascia of forearm.
Medial head- It originates from posterior surface of humerus, inferior to radial groove and inserts into proximal end of olecranon process of ulna and fascia of forearm.
Lateral head- It originate from posterior surface of humerus, superior to radial groove and inserts into Proximal end of olecranon process of ulna and fascia of forearm.