Biceps Brachii: The Muscles in Your Arms
The biceps brachii is a group of muscles located in the upper arm. It is made up of two heads, namely the long head and the short head. These heads originate from different parts of the scapula, or shoulder blade, and then merge together to form a tendon that attaches to the ulna bone in the forearm. While the biceps brachii spans across the shoulder and elbow joints and can be seen when flexing, its primary function is not to move the upper arm. Instead, it plays a crucial role in flexing the elbow joint and rotating the forearm.
Triceps Brachii
The triceps brachii is a muscle located in the upper arm. It originates in the shoulder but does not have any direct involvement in shoulder movements. The triceps brachii consists of three heads: a long head that originates at the scapula, and medial and lateral heads that originate from the humerus. This muscle is responsible for extending and retracting the forearm, as well as providing stability to the shoulder joint at the top of the humerus.