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Triceps Brachii Anatomy: Origin, Insertion, Action

(Last Updated On: August 10, 2018)
Triceps Brachii Origin, Insertion, Action, Innervation

Muscle Anatomy of the Triceps Brachii Long Head

Origin: Infraglenoid tubercle of the scapula
Insertion: Posterior surface of the olcranion process of the ulna
Actions: Extension of the arm at the shoulder, adduction of the arm at the shoulder, extension of the forearm at the elbow
Innervation: Radial nerve (C6, C7)
Blood Supply: Muscular branches and superior ulnar collateral and profunda brachii arteries from the brachial artery

Muscle Anatomy: Triceps Brachii Long Head Actions

Primary Actions of the Triceps Brachii Long Head

1.  Extension of the arm at the shoulder

  Agonists:

  • Deltoid (posterior part)
  • Latissimus Dorsi
  • Pectoralis Major (sternal head)
  • Teres Major

  Antagonists:

  • Deltoid (anterior part)
  • Coracobrachialis
  • Biceps brachii,
  • Pectoralis major (clavicular head)

2. Adduction of the arm at the shoulder

 Agonists: 

  • Latissimus Dorsi
  • Pectoralis Major
  • Teres Major

  Antagonists: 

  • Supraspinatus
  • Deltoid (middle part)

Note: Coracobrachialis and teres minor assist with adduction of the arm at the shoulder.

3. Extension of the forearm at the elbow

  Agonists:

  • Triceps Brachii (lateral and medial heads)
  • Anconeus

Antagonists:

  • Brachialis
  • Biceps brachii
  • Brachioradialis

Muscle Anatomy of the Triceps Brachii Lateral Head

Origin: Superior half of the posterior surface of the humeral shaft, lateral to the spiral groove
Insertion: Posterior surface of the olecranon process of the ulna
Actions: Extension of the forearm at the elbow
Innervation: Radial nerve (C6, C7)
Blood Supply: Muscular branches and superior ulnar collateral and profunda brachii arteries from the brachial artery

Primary Actions of the Triceps Brachii Lateral Head

1.  Extension of the forearm at the elbow

  Agonists:

  • Triceps Brachii (long and medial head)
  • Anconeus

  Antagonists:

  • Brachialis
  • Biceps brachii
  • Brachioradialis

Muscle Anatomy of the Triceps Brachii Medial Head

Origin: Posterior shaft of the humerus, medial and distal to the spiral groove
Insertion: Posterior surface of the olecranon process of the ulna
Actions: Extension of the forearm at the elbow
Innervation: Radial nerve (C6, C7)
Blood Supply: Muscular branches and superior ulnar collateral and profunda brachii arteries from the brachial artery

Primary Actions of the Triceps Brachii Medial Head

1.  Extension of the forearm at the elbow

  Agonists:

  • Triceps Brachii (long and lateral head)
  • Anconeus

  Antagonists:

  • Brachialis
  • Biceps brachii
  • Brachioradialis

Information about cause and effect of Triceps Brachii pain:

Triceps Brachii Muscle: Shoulder, Arm, Elbow, Hand Pain

Recommended Anatomy Books:

Anatomy Coloring Book

The Anatomy Coloring Book is one of the best study and reference books for beginning anatomy students. The diagrams are clearly labeled and allow you to see the relationship and placement of the various structures of the body. You will also be surprised how the act of coloring will help with recall. But this is not just a beginners book, it is also great for practitioners and therapists to have on hand to use with clients and patients to use as a visual reference.

Human Muscle Anatomy

The Trail Guide To The Body is another excellent book to help you learn the musculature of the human body. Though the book is geared toward massage therapists and physical therapist assistants, the book with its illustrations and text helps anyone gain a thorough understanding of the human musculoskeletal system and movement. I highly recommend this book for anyone studying anatomy and believe that MTs, PTAs, and teachers of body movements should have this book in their possession. I also highly recommend this book for the lay person who wants to gain understanding of the muscle, skeletal system and how our bodies move. This book will not disappoint!

Basic Clinical Massage Therapy

Out of the scores of books in my office Basic Clinical Massage Therapy is by far the most referenced book in my library. The musculoskeletal system is overlaid on human models allowing you to learn the precise location, origin and insertions of each muscle. The models are pictured in various poses throughout the book which also helps you visualize muscles in motion and their actions relationship with the skeletal structure and other muscles. Though it is written for massage therapists, it is an excellent book for anyone who wants to learn about the muscular system. MT's will benefit from recommended treatments for each muscle.

Muscle Anatomy Flashcards

Musculoskeletal Anatomy Flashcards Are you a student or professional therapist who needs to brush up on the musculoskeletal system? Dr. Joseph E. Muscolino DC has developed a comprehensive set of flashcards that will help develop a mind's picture of exactly where the muscles lie under the skin. A highly recommended study aid for students. Great for non students who want an easy comprehensive anatomy guide.

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