
The triceps is a large muscle located at the back of the upper arm in many vertebrates. It is made up of three parts: the long, lateral, and medial head. The triceps is responsible for the extension of the elbow joint and the straightening of the arm. It also plays a role in the stability and strength of the shoulder.
| Characteristics | Values |
|---|---|
| Location | Back of the upper arm |
| Shape | Fusiform or spindle-shaped |
| Type | Voluntary |
| Function | Extension of the elbow joint, straightening of the arm |
| Composition | Three heads: long, lateral, and medial |
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What You'll Learn
- The triceps is a large muscle at the back of the upper arm
- It is made up of three heads: the long, lateral, and medial head
- The triceps is responsible for the extension of the elbow joint and straightening of the arm
- It is a voluntary muscle, meaning it's a muscle you choose to move
- The triceps also plays a role in the stability and strength of the shoulder

The triceps is a large muscle at the back of the upper arm
The triceps is the muscle principally responsible for the extension of the elbow joint and the straightening of the arm. When the triceps muscle contracts, it causes the elbow to straighten. It also plays a significant role in the stability and strength of the shoulder. The triceps' position and function are critical for sustaining upper body strength and facilitating coordinated arm movements.
The triceps is a voluntary muscle, meaning it is a muscle that you choose to move. It is made up of skeletal muscle fibres that contract under conscious control. It is a fusiform, or spindle-shaped, muscle that is wider in the middle and narrower at each end.
The long head arises from the infraglenoid tubercle of the scapula, while the medial head arises proximally in the humerus, just inferior to the groove of the radial nerve. The lateral head is used for movements requiring occasional high-intensity force, while the medial fascicle enables more precise, low-force movements.
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It is made up of three heads: the long, lateral, and medial head
The triceps muscle is a large muscle located at the back of the upper arm. It is a voluntary muscle, meaning it's a muscle that you choose to move. The triceps is made up of three heads: the long, lateral, and medial head. These three heads converge into a single tendon that attaches to the ulna, one of the bones in the forearm. The long head arises from the infraglenoid tubercle of the scapula, while the medial head arises proximally in the humerus, just inferior to the groove of the radial nerve. The lateral head is used for movements requiring occasional high-intensity force, while the medial fascicle enables more precise, low-force movements. The triceps muscle is responsible for the extension of the elbow joint and the straightening of the arm. It also plays a significant role in the stability and strength of the shoulder. The triceps' position and function are critical for sustaining upper body strength and facilitating coordinated arm movements.
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The triceps is responsible for the extension of the elbow joint and straightening of the arm
The triceps is a large muscle located at the back of the upper arm. It is composed of three heads: the long, lateral, and medial head. These muscle heads converge into a single tendon that attaches to the ulna, one of the bones in the forearm.
The long head of the triceps arises from the infraglenoid tubercle of the scapula, while the medial head arises proximally in the humerus, just inferior to the groove of the radial nerve. The long head fascicle is employed when sustained force generation is demanded, or when there is a need for synergistic control of the shoulder and elbow. The lateral head is used for movements requiring occasional high-intensity force, while the medial fascicle enables more precise, low-force movements.
The triceps is a voluntary muscle, meaning it is a muscle that you choose to move. It is made up of skeletal muscle fibres that contract under conscious control.
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It is a voluntary muscle, meaning it's a muscle you choose to move
The triceps is a large muscle located at the back of the upper arm. It is a voluntary muscle, meaning it's a muscle you choose to move. The triceps is made up of skeletal muscle fibres that contract under conscious control. It is fusiform, or spindle-shaped, wider in the middle and narrower at each end.
The triceps is composed of three heads: the long, lateral, and medial head. These muscle heads converge into a single tendon that attaches to the ulna, one of the bones in the forearm. The triceps muscle is responsible for the extension of the elbow joint and the straightening of the arm. It also plays a significant role in the stability and strength of the shoulder. The triceps' position and function are critical for sustaining upper body strength and facilitating coordinated arm movements.
Tricep dips are one of the most common triceps moves you can do to strengthen your triceps muscles. The triceps is an extensor muscle of the elbow joint and an antagonist of the biceps and brachialis muscles. It can also fixate the elbow joint when the forearm and hand are used for fine movements, such as when writing.
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The triceps also plays a role in the stability and strength of the shoulder
The triceps is a large muscle at the back of the upper arm, running from the top of the shoulder to the elbow. It is composed of three heads: the long, lateral, and medial head. These muscle heads converge into a single tendon that attaches to the ulna, one of the bones in the forearm.
The triceps plays a role in the stability and strength of the shoulder. Its position and function are critical for sustaining upper body strength and facilitating coordinated arm movements. The long head fascicle is employed when there is a need for synergistic control of the shoulder and elbow. The triceps' role in shoulder stability is also important for activities such as writing, where it helps to fixate the elbow joint when the forearm and hand are used for fine movements.
Tricep dips are one of the most common exercises to strengthen the triceps muscles. This can help improve shoulder stability and strength by targeting the triceps muscle.
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Frequently asked questions
The tricep is a large muscle at the back of the upper arm.
The tricep is responsible for the extension of the elbow joint and straightening of the arm.
The tricep consists of three parts: the medial, lateral, and long head.
The tricep's major action is the extension of the forearm upon the elbow joint, in opposition to the biceps brachii.











































