The anterior deltoid acts as a third-class lever in the human body. In this lever system, the effort is applied between the fulcrum (the shoulder joint) and the load (the weight of the arm or resistance being moved). This arrangement allows for a greater range of motion and speed, making it effective for lifting and raising the arm forward.
The deltoid abducts the arm through a second-class lever system. In this system, the resistance (arm) is between the force (deltoid muscle) and the fulcrum (shoulder joint). This configuration allows for greater force output with less effort.
Anterior, posterior and lateral also.
The deltoid abducting the arm is an example of a third-class lever, where the effort (muscle force) is applied between the fulcrum (shoulder joint) and the resistance (weight of the arm).
Anterior deltoid
anterior deltoid pectoralis major serratus anterior
The deltoid muscle uses a third-class lever system when abducting the arm. In this system, the effort (contraction of the deltoid) is applied between the fulcrum (the shoulder joint) and the load (the weight of the arm). This arrangement allows for a greater range of motion and speed of movement, although it requires more effort to lift the arm compared to other lever systems.
the supraspinatus ...I think Deltoid muscle(acromial part)
The deltoid muscle is the big muscle on the shoulder. It has three parts; the front or anterior, middle and back or posterior. It involves the shoulder joint.
A human foot is a third-class lever, where the effort is applied between the load and the fulcrum. The ankle joint acts as the fulcrum, the ball of the foot is where the force is applied (effort), and the resistance (load) is at the toes.
The deltoid muscle looks like a large "D" covering the shoulder. There are three parts to it: The anterior deltoid which is commonly called front delts, The lateral deltoids or side delts, and the posterior deltoid or rear delts. The anterior deltoid's (front delts') origin is the clavicle, the lateral's (side delts') origin is the acromion process of the scapula and the posterior's (rear delts') origin is the spine of the scapula. The insertion for all is the deltoid tuberosity on the humerus.
Pectoralis major sternocostal part and anterior fibres of Deltoid
The deltoid muscle looks like a large "D" covering the shoulder. There are three parts to it: The anterior deltoid which is commonly called front delts, The lateral deltoids or side delts, and the posterior deltoid or rear delts. The anterior deltoid's (front delts') origin is the clavicle, the lateral's (side delts') origin is the acromion process of the scapula and the posterior's (rear delts') origin is the spine of the scapula. The insertion for all is the deltoid tuberosity on the humerus.