Triceps Brachii Anatomy: Origin, Insertion, Actions

Triceps Brachii Anatomy Study

Triceps Brachii Anatomy

Triceps Long Head

Origin:  Infraglenoid tubercle of the scapula
Insertion: Posterior surface of the olcranion process of the ulna
Action: Extension of the arm at the shoulder, adduction of the arm at the shoulder,  extension of the forearm at the elbow
Blood Supply: Muscular branches and superior ulnar collateral and profunda brachii arteries from the brachial artery.
Innervation: Radial nerve (C6,7)

Primary Action 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)

Secondary Actions of the Triceps Brachii Long Head: 
1. Adduction of the arm at the shoulder

  • Agonists: Latissimus Dorsi, Pectoralis Major, Teres Major
  • Antagonists: Supraspinatus, Deltoid (middle part)

2. Extension of the forearm at the elbow

  • Agonists: Triceps Brachii (lateral and medial heads), Anconeus
  • Antagonists: Brachialis, Biceps brachii, Brachioradialis

 

 

Triceps 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
Action: Extension of the forearm at the elbow
Blood Supply: Muscular branches and superior ulnar collateral and profunda brachii arteries from the brachial artery.
Innervation: Radial nerve (C6,7)

Primary Actions of Triceps Lateral Head:

1. Extension of the arm at the elbow

  • Agonists: Triceps Brachii (medial head and long head), Anconeus
  • Antagonists: Brachialis, Biceps Brachii, Brachioradialis

Triceps Medial Head

Origin:  Posterior shaft of the humerus, medial and distal to the spiral groove (deep to the long and lateral heads of the triceps brachii)
Insertion: Posterior surface of the olecranon process of the ulna
Action: Extension of the arm at the elbow
Blood Supply: Muscular branches and superior ulnar collateral and profunda brachii arteries from the brachial artery.
Innervation: Radial nerve (C6,7)

Primary Actions of Triceps Medial Head:

1. Extension of the forearm at the elbow

  • Agonists: Triceps Brachii (lateral head and long head), Anconeus
  • Antagonists: Brachialis, Biceps Brachii, Brachioradialis

For muscle pain and symptoms see: Triceps Brachii Shoulder, Arm, Hand Pain


Musculoskeletal Anatomy Flashcards

Musculoskeletal Anatomy Flashcards Musculoskeletal 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.

Anatomy Coloring Book

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.

 

References:

The Trigger Point Therapy Workbook – Claire Davies, Amber Davies, and David G. Simons

Basic Clinical Massage Therapy: Integrating Anatomy and Treatment – James H. Clay and David M. Pounds

Trigger Point Therapy for Myofascial Pain – Donna Finando and Steven Finando

Massage Therapy Principles and Practice – Susan Salvo

Theory & Practice of Therapeutic Massage – Mark Beck

 

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