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Leg Anatomy – How to Use How Your Muscles Work to Build Muscle

Big Legs

What is the anatomy of the legs, and how can you use it to build bigger muscles? The legs are the lower limbs of the body, and they enable movement while supporting the body. We cannot easily disregard the legs and their role because they make movement easy for the body. Hence, knowing about them and how to keep them in good shape must be a priority.

Every muscle in the legs, whether big or small, plays a significant role in the body. When the body rest or moves, the leg muscles work. Because most muscles in the legs can stretch for a distance, they call them long muscles.

The small muscles assist the big muscles, maintain joints, assist in rotating joints, and enable other movements. Also, whenever the muscles contract and relax, the skeletal bones move. Regardless of their size, these muscles found in the legs are the leading causes of movement. Finally, when these muscles are not taken care of, the legs weaken.

Leg Anatomy

The anatomy of the legs refers to the entire structure of the legs. This article will open your eyes to the muscles of the legs and what they do. Subsequently, the legs have four parts:

  • Upper legs
  • Knee
  • Lower legs
  • Ankle

Upper leg

This part of the legs starts from the hip to the knee and is called the thigh. The thigh is the strongest part of the lower limbs. The thigh is the most prominent part of the legs. Consequently, the thigh provides power and speed to the body.

The upper leg contains the longest bone in the body. The femur bone happens to be the only bone in the upper legs. Also, it is called the thigh bone and one of the strongest bones in the body. The femur accounts for nearly one-fourth of a person’s height. Also, it contains red bone marrows that produce most of the body’s blood.

Muscles in the upper leg


These muscles found in the upper leg allow the knee to bend. Several other muscles are attached to and act on the femur. Here are the three hamstring muscles:

  • Biceps femoris: This is a long muscle that runs from the thigh region to the fibula’s head. The muscle flexes the knee and has two parts; the long head and the short head.
  • Semimembranosus: It is a long muscle that runs from the pelvis to the tibia. This muscle helps in rotating the tibia and extending the thigh.
  • Semitendinosus: The Semitendinosus is in the middle of the biceps femoris and semimembranosus. Also, this muscle helps in extending the thigh and flexes the knee.


The quadriceps have four muscles that are in front of the thigh. Also, with these muscles, the knees can stay straightened when bending down. Here are the four quadricep muscles:

  • Vastus lateralis: Otherwise known as the vastus externus. They are the biggest and strongest muscle in the quadriceps. It helps to extend the lower legs and improve the body when standing up.
  • Vastus medialis: This muscle that makes up the quadriceps starts from the thigh down to the knee. The muscle helps in extending the legs.
  • Rectus femoris: It runs from the hip region down to the kneecap. The muscle helps to extend and raise the knee.
  • Vastus intermedius: This muscle happens to be the deepest amongst the quadriceps. It acts as a cover for the femur, covering both the front and side part.


The adductors are muscles that enable the thighs to come together. They are within the thigh. Also, they play a crucial role in the anatomy of the legs and lateral movement. Finally, the abductors include:

  • Adductor Magnus
  • Adductor Longus
  • Obturator externus
  • Adductor Brevis
  • Gracilis


The knee is a point in the legs where the femur, tibia, and patella meet. The patella, also known as the kneecap, works as an attachment for various tendons and ligaments. Finally, it protects the tendons and ligaments.


The tendons are a group of tissues connected and are at the muscles’ end to attach the muscles to bones. The patellar tendon happens to be the largest in the knee. It attaches the tibia and the patella. At the same time, the quadriceps tendon connects the quadriceps muscles to the patella.


As for the ligament, they are a group of tissues connected, and they surround a joint. Their primary duty is to support the joints and regulate the movement of the joint. Also, there are four ligaments in the knee, and they are:

  • Anterior cruciate ligament: Stops the tibia in the lower leg when it wants to move too far.
  • Posterior cruciate ligament: Stops the knee from moving too far backward.
  • Medial collateral ligament: Helps stabilize the inner knee.
  • Lateral collateral ligament: Provides stability for the outer knee.

Lower leg

The lower leg refers to the legs from the knee to the ankle, and it is popularly called the calf. In this part of the legs, there are mainly two bones; the tibia and fibula.

  • Tibia: This is larger than the fibula and is accountable for carrying weight. It is also referred to as the shinbone and is located medially.
  • Fibula: The fibula is located laterally and mainly acts as a means of attachment for the lower leg muscles.

Muscles of the lower leg

Other parts of the lower leg

  • Fibular nerves: These nerves stimulate muscles found in the front part of the leg.
  • Tibial Nerves: The tibial nerves make up the sciatic nerve. They stimulate the muscles found in the back of the lower leg.
  • Achilles tendon: This tendon connects the calves’ muscles to the bones in the ankle and foot.


What connects the lower leg to the foot is the ankle. The ankle is a joint and allows plantar flexion and dorsiflexion in the foot. The bones that make up the ankle are the tibia, fibula, and talus. Also, in the ankle, there are two ligaments:

Medial ligament: they are often called the deltoid ligaments and are in the inner ankle.

Lateral ligaments: these ligaments are in the outer ankle.

Anatomy of the Legs and Exercises

The human legs can withstand high pressure and can be very useful when engaged in exercises. During exercise, the muscles generate three different contractions. A concentric contraction causes muscles to shorten, thereby creating force. Eccentric contractions cause muscles to elongate in response to a greater opposing force. Isometric contractions generate power without changing the length of the muscle.

Finally, the muscles in the legs work together when you perform activities or exercise. The small muscles work with the bigger muscles to get you the results you need. Use lifts like squats, deadlifts, leg curls, leg presses, leg extensions, and lunges to build the legs. You can use dumbbells or a barbell with the standing exercises. The more weight the exercise allows you to lift, the more muscle you can build with it. Thus, squats and deadlifts are two of the best leg exercises.