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Triceps Brachii Anatomy: Origin, Insertion, Actions

tricep-anatmy

Triceps Brachii

O, I, A of the Triceps Brachii

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 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 (sternal head)
  • Teres Major

  Antagonists: 

  • Supraspinatus
  • Deltoid (middle part)

Coracobrachialis and teres minor also 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

Triceps Lateral Head

Origin:  Superior half of the posterior surface of the humeral shaft, lateral to the spiral groove.
Insertion: Posterior surface of the olcranion process of the ulna
Action: Extension of the arm at the shoulder
Vascular Supply: Muscular branches and superior ulnar collateral and profunda brachii arteries from the brachial artery.
Innervation: Radial nerve (C6,7)

Primary Actions of the Triceps Brachii Lateral Head:

1. Extension of the arm at the shoulder

  Agonists: 

  • Triceps Brachii (medial 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
Insertion: Posterior surface of the olcranion process of the ulna
Action: Extension of the forearm at the shoulder
Vascular Supply: Muscular branches and superior ulnar collateral and profunda brachii arteries from the brachial artery.
Innervation: Radial nerve (C6,7)

Primary Actions of the Triceps Brachii Medial Head:

1. Extension of the forearm at the shoulder

  Agonists: 

  • Triceps Brachii (medial and long head)
  • Anconeus

Antagonists: 

  • Brachialis
  • Biceps brachii
  • Brachioradialis
triceps-fea

Information about cause and effect of triceps brachii pain:

Triceps Brachii Muscle: Shoulder, Arm, Elbow, 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