Your Monday Muscle: #5 Triceps Brachii

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Triceps brachii

Triceps Brachii Muscles – the muscles used to straighten your arm

The Triceps Brachii muscles are located on the back of the humerus and more commonly referred to as the triceps. They derive their name from a Latin phrase meaning “three headed arm muscle”,  due to the fact that the triceps muscles have three muscle heads and therefore have three separate origin attachment points. These three heads are called the Lateral, Medial and Long and they connect the Humerus, Scapula and the >Ulna. The Triceps Brachii muscles are primarily responsible for the extension of the elbow joint (straightening of the arm). They are the largest muscles in the upper arms.

As with the Bicep muscle which has two heads and therefore two origin points, the three-headed Triceps muscle has three different origin points. These origin attachment points are as follows;

1. The Long head arises from the lower part of the Glenoid Cavity which is a shallow depression on the scapula where the head of the Humerus fits. This head is responsible for giving the Triceps Muscle the horse shoe shape.

2.The Lateral head  which arises from the upper half of the outside posterior surface of the humerus.

3.The Medial head which arises from the dorsal and inside posterior of the humerus and can usually only be visible closer to the elbow joint as it is mostly covered by the Lateral and Long heads.

— read more at musclesused.com

Fun Facts

Here are some fun facts about triceps muscles that you need to know.

  1. The Triceps muscle makes up 2/3 of the muscle in your arm.
  2. The average triceps muscle is twice as big as the biceps muscle.
  3. The Triceps muscle has 3 separate heads.
  4. The Triceps muscle is mostly responsible for straightening your arm.
  5. The Triceps muscle instigates shoulder and elbow rotation.
  6. More than 90% of a horse’s total muscle weight is located at their triceps.
  7. In many mammals such as dogs, they have a fourth head called the accesory head. It is located between the lateral and medial heads.
  8. The triceps brachii is a contributor to both tennis elbow and golfers elbow.
  9. It and the serratus anterior are known as the boxer’s muscles because these muscles deliver the straight-arm punch.

— sources:

 

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