The structure of the abs. The abdominal muscles include the rectus abdominis muscle, the external and internal oblique muscles, and the transversus abdominis muscle. Rectus Abdominis The rectus abdominis is the most visible muscle in the abdominal...
The Structure of Lats. The latissimus dorsi and the teres major are two distinct muscles of the lower and middle back. They work synergistically in movements involving arm extension, retraction, internal rotation, and shoulder adduction. Latissimus Dorsi...
The Structure of Trapezius and Rhomboids The trapezius and the rhomboids are two distinct muscle groups that work synergistically in movements involving the elevation, depression, rotation, and retraction of the scapula. They also play a crucial role in...
The structure of the quads The quadriceps are a muscle group located at the front of the thigh, consisting of four main muscles: the vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris. The Vastus Muscles The vastus lateralis is the...
The Structure of Gluteal Muscles The gluteal muscle group is composed of three main muscles: the gluteus maximus, the gluteus medius, and the gluteus minimus. Gluteus Maximus The gluteus maximus is the largest and most powerful of the gluteal muscles. It...
The Structure of the Hamstrings The hamstring muscles are a muscle group located at the back of the thigh. They comprise three main muscles: the biceps femoris, the semitendinosus, and the semimembranosus. The biceps femoris The most lateral muscle of...
The Structure of the Adductors. The adductors constitute a muscle group located on the inner thigh, responsible for hip adduction, i.e., bringing the thigh closer to the midline of the body. They consist of the adductor magnus, short adductor muscles, and long...
The Structure of the Neck The neck is composed of several muscles, both superficial and deep, including the splenius muscle of the neck, the semispinalis muscle of the neck, and the longissimus muscle of the neck. Their antagonists are the sternocleidomastoid...
The Structure of the Shoulders The shoulders consist of several muscles that work together to enable a wide range of movements. Among these muscles are the deltoids, which are the most superficial muscles, and the rotator cuff, which is composed of deeper...
The Structure of the Forearms The muscles of the forearms are numerous and play a crucial role in the movements of the fingers, hands, and forearms. The brachioradialis The brachioradialis is a muscle located in the outer and upper part of the forearm,...
The Structure of the Pectorals The pectoral muscles, including the major pectoral and the minor pectoral, are crucial for the development and strength of the upper body. Together, these muscles are responsible for flexion, adduction, and medial rotation of the...
The Structure of the Triceps The triceps muscles, comprising the long, lateral, and medial heads, play a crucial role in arm stability and strength. Together, these muscles are responsible for elbow extension and arm adduction, or lowering. Long Head The...
The structure of the calves The triceps surae is composed of the gastrocnemius and the soleus. These muscles are located at the back of the leg, just below the knee, and descend along the leg and join to form the Achilles tendon, which inserts into the...
The Structure of the Biceps The biceps brachii is a muscle located at the front of the arm. It consists of two distinct muscle heads, the long head and the short head, which come together to form a common tendon at the upper end of the muscle. It enables the...