Athena Vale
There are over 600 muscles in the human body, and they are considered the only tissue in the body with the ability to contract and move other body parts. About 40% of your body weight is made up of muscle tissues. In strength training, the six major muscle groups are the chest, back, shoulders, legs, arms, and core. Within these groups, there are primary muscles that are targeted in exercises, and secondary muscles that assist in the movement. For example, the legs, chest, and back are primary muscle groups that require the assistance of secondary muscle groups such as the shoulders, triceps, biceps, abdominals, and calves.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | Over 600 |
| Tissue type | Muscles are the only body tissue that can contract and move other body parts |
| Percentage of body weight | 40% |
| Function | Locomotion, complex and impressive moves, stability, and support |
| Muscle groups | Chest, back, shoulders, legs, arms, and core |
| Primary muscle groups | Legs, chest, and back |
| Secondary muscle groups | Shoulders, triceps, biceps, abdominals, and calves |
| Compound exercises | Deadlift, squat, and bench press |
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What You'll Learn
The chest, or pectorals, is a major muscle group
The pectoralis minor lies underneath the pectoralis major. It is a thin, triangular muscle that attaches to the ribs and serves to stabilise the scapula, the large bone of the shoulder. The serratus anterior is located more laterally in the chest wall and forms the medial border of the axilla region. The subclavius is a small muscle located directly underneath the clavicle, running horizontally.
The chest is a primary muscle group that requires secondary muscle groups—such as the shoulders, triceps, and biceps—to assist in every exercise. There are several exercises that focus on the pectorals, including the flat barbell bench press and the flat dumbbell bench press. These exercises involve the individual lying supine on a bench with their feet flat on the ground, and utilising the pectoralis major muscle to extend their arms and lift weights.
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The back is the most complex muscular structure in the body
The human body has about 700 named muscles, which make up roughly half of a person's body weight. These muscles are responsible for movement, maintaining posture, and generating body heat. The back muscles, in particular, are a complex network that supports the torso, enables movement, and helps with breathing. They are the main structural support for the trunk, keeping us stable and helping us maintain our posture.
Healthcare providers divide the back muscles into three groups or layers: superficial (extrinsic), intermediate, and intrinsic (deep) back muscles. The superficial back muscles are the ones closest to the surface, just under the skin. They help move the shoulders and are typically what people picture when thinking about their back muscles. This group includes the latissimus dorsi or "lats," the largest muscles in the upper half of the body.
The intermediate back muscles, on the other hand, are those that lie between the superficial and deep layers. These muscles assist in spine stabilization and help with movements such as twisting and bending. The intrinsic or deep back muscles are the deepest layer, positioned close to the spine. They play a crucial role in spine stability and facilitate movements requiring core strength.
The back muscles work together to allow us to bend, twist, turn our heads, and extend our backs. They also assist in breathing by expanding and contracting the chest during inhalation and exhalation. This involuntary action is controlled by the body without conscious thought. The back muscles are constantly working to hold us in place, providing stability and support for our bodies. Their complex arrangement and diverse functions make the back the most intricate muscular structure in the human body.
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The legs are a primary muscle group
The anterior muscles are located in the front part of the leg, extending from the knee down to the foot. They include the extensor digitorum longus, extensor halluces longus, fibularis tertius, and tibialis anterior. The tibialis anterior, located on the outside of the shin bone, is the main muscle used to raise the front of the foot upward toward the shin.
The lateral muscles run along the outside of the lower leg, starting just below the knee and going down to the ankle. These include the fibularis longus and fibularis brevis. The lateral muscles stabilise the foot during walking or running.
The posterior muscles are in the back of the lower leg, with some being superficial and close to the surface of the skin, while others are deeper inside the leg. These include the calf muscles, such as the gastrocnemius and the soleus. The gastrocnemius forms the bulk of soft tissue on the posterior leg and is referred to as the calf. The posterior muscles help with actions like flexing and pointing the toes, jumping, running, and pushing off into a sprint. They also help to lock and unlock the knee, maintain good posture, and support the arch of the foot.
The upper leg muscles are very strong and include the gluteus maximus, the largest muscle in the upper leg, and the gluteus medius, which helps with the stability of the pelvis and hip abduction. The rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius make up the quadriceps, commonly known as the quads. These muscles are heavily used in basic movements like walking, running, jumping, and sitting.
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The shoulders, or deltoids, are essential for upper-body movement
The deltoid muscles, or shoulders, are a group of muscles that play a crucial role in upper-body movement and everyday activities. They are named for their resemblance to the inverted Greek letter delta, forming a triangle that covers the top of the shoulder joint. This muscle group is essential for moving the arms in various directions, including forward, sideways, and backward.
The deltoids consist of three bands of muscle fibres: the anterior deltoids at the front, the lateral deltoids down the side, and the posterior deltoids at the back. These muscle fibres work together to enable a wide range of arm movements. For example, the posterior deltoids allow the arm to move backward in a motion called extension, while the lateral deltoids help with moving the arm out to the side or in towards the body, known as abduction and adduction, respectively.
The deltoids also play a vital role in shoulder stability and injury prevention. They work alongside other shoulder muscles, such as the rotator cuff muscles, to stabilise the shoulder joint and protect it from dislocations and other injuries. This stability is crucial during activities that involve lifting weights or carrying objects.
Understanding the anatomy and functions of the deltoids is important for athletes and fitness enthusiasts. Targeted exercises, such as the Arnold Press, Reverse Fly, and Rear Delt Fly, can strengthen the deltoid muscles and improve upper-body strength. By incorporating these exercises into a training routine, individuals can enhance their functional strength and athletic performance, making everyday activities and sports more manageable.
Additionally, knowledge of the deltoids is crucial in medical contexts, especially in diagnosing and treating shoulder conditions. Deltoid injuries, such as detachments from the clavicle, can occur and may require surgical reattachment. Conditions like adhesive capsulitis (frozen shoulder) and axillary nerve palsy can also affect the deltoid muscles, causing pain, weakness, and reduced range of motion in the shoulder and arm.
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The arms have four primary muscles
The human body has over 600 muscles, which support almost every part of the body. Some muscles are prime movers, while others are secondary movers. Primary muscles are the prime movers, which are the muscles that are targeted during exercise. For example, the legs, chest, and back are considered primary muscle groups.
These four muscles work together to help with big and small arm movements. They control the arms, hands, fingers, and thumbs, allowing for precise movements such as threading a needle, as well as larger movements like throwing a ball or doing push-ups. The arm muscles are also essential for some crucial tasks of daily life, such as self-hygiene and feeding.
It is important to note that there are also many other muscles in the arm, including the forearm, which has 19 muscles, eight of which are flexors responsible for bending the arms, wrists, and hands, and 11 extensors that handle extension. These muscles in the forearm also have several important jobs, such as controlling the top joints in the fingers and moving the thumb joint.
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Frequently asked questions
Primary muscles are the muscles that are targeted by a particular exercise. For example, the chest, back, shoulders, legs, arms, and core are considered the six primary muscle groups in strength training.
Exercises like the deadlift, squat, and bench press are compound exercises that target multiple primary muscle groups.
Knowing the primary muscles and the exercises that target them can make your workouts more efficient. This can help you build muscle faster, improve your athletic performance, and achieve your fitness goals.
The deltoids, or shoulder muscles, are an example of primary muscles in the upper body. They consist of three parts: the anterior deltoid (front), lateral deltoid (side), and posterior deltoid (back).
The quads are a group of four primary muscles in the front of the thigh that are heavily used in basic movements such as walking, running, and jumping. The glutes and hamstrings are also primary muscles in the lower body.
