Beginners Guide: Major Muscles of the Human Body

Tuesday, January 21, 2020

Beginners guide to the muscles of the human body.

The muscles in your bodywork with your bones to help you move in a huge variety of ways.
There are over 600 muscles. 

 Pectoralis major: is a thick, fan-shaped muscle, situated at the chest of the human body.
If you go to the gym and bench press you are using this muscle.

The Bicep is a large muscle that lies on the front of the upper arm between the shoulder and the elbow. The function of the bicep is to flexes and twists the forearm. If you are working out and completing curls, the bicep is being flexed.

 The abdominal muscles support the trunk, allow movement and hold organs in place.

The sartorius muscle is the longest muscle in the human body. It is a long, thin, muscle that runs down the length of the thigh. This muscle helps you cross your legs.

The abductor muscle group is located on the lateral side of the thigh and moves the thigh away from the body’s midline. 

The trapezius muscle resembles a trapezoid or diamond-shaped quadrilateral. The trapezoid would run from your head to your shoulder, to midway down your back.
It helps support the weight of the arm and move the shoulder.

The deltoid forms the rounded contour of the human shoulder. It is a major mover of the arm. When you lift your arm from your waist to overhead you use your deltoid.

The latissimus dorsi is the largest muscle in the upper body. It is responsible for extension, adduction, and internal rotation of the shoulder. This muscle helps you do pull-ups at the gym.

The serratus anterior is a muscle that originates on the surface of the 1st to 8th ribs at the side of the chest. It acts to pull the scapula forward around the thorax.

 The external oblique functions to pull the chest downwards and compress the abdominal cavity, It also performs same side-bending and opposite side rotation.

The brachioradialis is a muscle of the forearm that flexes the forearm at the elbow. For example, when you use a  hammer to drive a nail you flex this muscle.

Finger extensions include nine extensor muscles found in the posterior side of the forearm and extend the hand and fingers.

Finger flexors help you close your hand.

Quadriceps is a large muscle group that includes the four prevailing muscles on the front of the thigh. These muscles are the great extensor muscle of the knee. When you ride a bike the quadriceps are used to push the pedals.

hamstring is one of the three posterior thigh muscles in between the hip and the knee.  The hamstrings cross and act upon two joints – the hip and the knee. When you run the hamstrings pull the heel to your buttocks.

The gastrocnemius forms half of the calf muscle. Its function is flexing the foot at the ankle joint and flexing the leg at the knee joint.

Tibialis anterior is responsible for flexing the foot backward and inverting the foot.

The soleus is a powerful muscle in the back part of the calf. It runs from just below the knee to the heel, and is involved in standing and walking.

The infraspinatus muscle is a thick triangular muscle. It is one of the four muscles of the rotator cuff, it’s the main function is to rotate the humerus and stabilize the shoulder joint.

The teres major helps rotate the humerus and assists the latissimus dorsi in drawing the previously raised humerus downward and backward.

The triceps are large muscles on the back of the upper arm. Triceps are responsible for straightening the arm.

The gluteus medius is a muscle that helps with hip movement.
When you walk and run it aids in stabilizing your pelvis, in particular when you perform activities where you balance on a single leg.

The gluteus maximus is the main extensor muscle of the hip. You use the gluteus maximus when you stand up from a chair, sprint, run, and go up steps.


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