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Functional anatomy of the deltoid muscles. Joint actions, location, pictures, attachments and exercises for the anterior, middle, and posterior deltoids (delts).

Lesson 8: Introduction To Deltoids

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I have almost completed my CPT certification and am half-way through the Human Movement certification to inform my massage practice. The different modalities of reading, watching audiovisual materials, and attending live or recorded webinars have been important to my learning style and for review.

Brookbush Institute has the most detailed, specific and effective tools for online learning for movement and/or bodywork professionals. I love the combination of the videos as well as the text available online.

I recently completed the CPT course. It was demanding yet practical. I would highly recommend it for anyone wanting an education about human movement.

I have my personal trainer certificate through here and am almost finished my human movement specialist certification. Overall, the education that Brookbush has packaged together for clinicians and trainers is invaluable. I am a physio assistant so coming from more of a rehab background I appreciate that this education has been beneficial both as a trainer and in a rehab setting. I love that I have been able to do all learning at my own pace and able to work around my schedule. Thank you for setting up this platform! Highly recommend :)

I have been a massage therapist for 10 yrs and I feel like all the “pieces” I’ve learned throughout the yrs have been put into place and can see the full picture. I am also a member to tons of great content since I love to learn! I plan to get my CPT through them as well.

I have been following Brent Brookbush for nearly a decade- back when I was a personal Trainer and now as a Physical Therapist. BBI is an incredible resource for any movement nerds and corrective exercise specialists! The information is thorough with multiple real world applications. I am looking forward to an in-person Manual Therapist course the second they do one a little bit closer to Virginia ;)

I have taken both the Human Movement Specialist and Certified Personal Trainer certificate programs and have found the value in understanding the how and ways the body moves and functions and from evidence, non-biased, outcome, conceptual, theoretical, and practical approach to helping my clients/patients look better, feel better, and move better.

Over the last years I've returned time and again to Brookbush Institute for stellar coursework as I've worked toward a Human Movement Specialist certification. (I'm currently ACE CPT, and in training with Anatomy Trains for Structural Integration Manual Therapy.) Every Brookbush Institute module is fantastic and each one includes detailed informational videos, written descriptions of how to-do, and, more importantly, why to-do!

I am a 70 yr old chiropractor and no other healthcare provider was able to come up with an exercise protocol particular to my structural and balances and muscle deficits and keep me in the game. And as for continuing education on human skeletal movement, the website is phenomenal full of great exercises for particular mechanical dysfunction.

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Having courses count towards different certifications makes it so users can transition seamlessly from one certification to another. In my case, going from earning the BI CPT to earning the BI HMS was an easy decision and I am proud to have earned both certifications. I have also had the pleasure of going to a Live HMS workshop that was well taught by Instructor Boettcher and that was excellent to see how the methods and techniques are implemented.



I have been a member of BBI for years and every course I have taken has been incredibly informative. I learn more from these courses than I do at local CEU courses for my PTA license. I also earned my CPT and HMS certifications through the platform. It was so convenient and the content was top notch! Forever member.

We learn principles in academia, we learn cool new modalities via whatever specialty certification, but BBI really concentrates on the nuances of passive treatment and they do a fantastic job. The format in which BBI instructs soft tissue specialists (DPTs, Chiros, ATs) like myself feels like almost like an apprenticeship. You get a thoroughly detailed explanation of the “why’s”, and a visual comprehension of how to apply. Personally, I believe application is where the good and the great are distinguished.

Brookbush has been incredibly helpful since I was in massage school and now as I’m in my career! I run my own practice and it gives me the resources I need to not only improve what I already know, but also help me navigate better, more efficient ways of treatment.

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This course describes the deltoid muscles, also known as the shoulder muscles or delts, and how the muscle fibers of the deltoids are divided into “three heads” or “three parts”: anterior head (front delt), middle head (lateral deltoid), and posterior head (rear delt).

Further, this course describes their contribution to motion of the humerus (upper arm bone) at the shoulder joint (glenohumeral joint). This includes the anterior deltoid contributing to shoulder flexion during a front raise or horizontal adduction during a bench press, the middle deltoid (lateral deltoid) contributing to shoulder abduction during a lateral raise or upright row, and the posterior deltoid contributing to shoulder horizontal abduction during a reverse fly or shoulder extension during a seated row. Additionally, this course analyzes the contribution of the deltoid and scapular muscles (shoulder blade muscles) to two of the best exercises for the deltoids, the overhead press, and the reverse fly.

Sports medicine professionals (personal trainers, fitness instructors, physical therapists, massage therapists, chiropractors, occupational therapists, athletic trainers, etc.) must be aware of the deltoid muscle for detailed analysis of human movement, and the development of sophisticated exercise programs and therapeutic (rehabilitation) interventions. Further, this course is essential knowledge for future courses discussing the neural innervations of the deltoids (axillary nerve), the origin and insertion of the deltoids (spine of the scapula, acromion, deltoid tuberosity of the humerus), its synergistic function with other shoulder muscles (e.g. synergy with the rotator cuff, pectoralis major, latissimus dorsi during shoulder motion), injury and physical therapy issues (e.g. shoulder pain, deltoid pain, deltoid strain, hypertonic deltoid muscle fibers, trigger points, etc.), and sports performance (e.g. max bench press, throwing, shooting, punching, lifting).

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Pre-approved for Continuing Education Credits for:

For more advanced anatomy check out our integrated functional anatomy courses:

The anterior, middle, and posterior deltoid muscles, which run from the scapula to the deltoid tuberosity of the humerus

Course Description: Deltoids

Introduction to the deltoid muscle from the Brookbush Institute course study guide.

Course Study Guide: Introduction to Deltoids

In this video, we describe the deltoid muscles. We identify the relative location of these muscles, as well as describe the joint actions associated with the anterior, middle, and posterior deltoid. 

This course explains how the deltoids contribute to the motion of the humerus at the shoulder joint (glenohumeral joint), with many examples of daily activities, including movement analysis of several exercises. 

This is foundational knowledge for all movement professionals, including personal trainers, physical therapists, athletic trainers, massage therapists, chiropractors, occupational therapists, etc.

Course Video Lesson: The Deltoids

 1741, in deltoid muscle, so called for its shape, from Greek deltoeides "triangular," literally "shaped like the letter delta;" see 

The deltoid is commonly divided into 3 distinct parts based on function, fiber arrangement, neural innervation, and distinct separation at the proximal attachment. The 3 divisions are:

These muscles originate on the distal third of the clavicle, acromion process, and spine of the scapula, and insert into the deltoid tuberosity of the humerus. These muscles cross the shoulder (glenohumeral joint) and assist in motion of the arm. They have no attachment to the rib-cage or torso, so unlike our 

Axial Scapular Muscles, under most normal circumstances

 cannot move the scapula and shoulder girdle.

Before we start analyzing the function of each muscle, make a word bank for yourself. What are the joint actions of the shoulder/glenohumeral joint? The muscles in this lecture must perform joint actions in this word bank… they cannot perform any other actions. For example, there is no such thing as 

Actions: Flexion, horizontal adduction, and internal rotation

Actions: Horizontal abduction, extension, and external rotation

Origin and insertion of the deltoid muscle

Introduction

Shoulder Joint Actions Graph

Shoulder Joint Actions Graph Answer Key

Activity: Shoulder Joint Actions

The anterior deltoid on the front side of the shoulder complex

Anterior Deltoid: Attachments

The deltoid complex, with the anterior deltoid highlighted in red

Anterior Deltoid Activity

Anterior Deltoid Answer Key

Anterior Deltoid

The middle deltoid highlighted in green

Middle Deltoid: Attachments

The middle deltoid sits between the anterior and posterior portions of the deltoid muscles

Middle Deltoid Activity

Middle Deltoid Answer Key

Middle Deltoid

The posterior deltoid on the back side of the shoulder complex

Posterior Deltoid: Attachments

A superficial view of the deltoid muscles, with the posterior deltoid highlighted in blue

Posterior Deltoid Activity

Posterior Deltoid Activity Answer Key

Posterior Deltoid

Carolyn Richardson, Paul Hodges, Julie Hides. Therapeutic Exercise for Lumbo Pelvic Stabilization – A Motor Control Approach for the Treatment and Prevention of Low Back Pain: 2nd Edition (c) Elsevier Limited, 2004

John V. Basmajian, Carlo J. De Luca. Muscles Alive: Their Function Revealed by ElectroMyography. 1985

Bibliography

Questions, comments, and criticisms are welcomed and encouraged

Lesson 8: Introduction To Deltoids

Related Courses:

Course Description: Deltoids

Course Study Guide: Introduction to Deltoids

Course Video Lesson: The Deltoids

Introduction

Activity: Shoulder Joint Actions
2 Sub Sections

Anterior Deltoid
3 Sub Sections

Middle Deltoid
3 Sub Sections

Posterior Deltoid
3 Sub Sections

Bibliography

Related Courses:

Comments

Guest

Lesson 8: Introduction To Deltoids

Related Courses:

Course Description: Deltoids

Course Study Guide: Introduction to Deltoids

Course Video Lesson: The Deltoids

Introduction

Activity: Shoulder Joint Actions2 Sub Sections

Anterior Deltoid3 Sub Sections

Middle Deltoid3 Sub Sections

Posterior Deltoid3 Sub Sections

Bibliography

Related Courses:

Comments

Guest

Activity: Shoulder Joint Actions
2 Sub Sections

Anterior Deltoid
3 Sub Sections

Middle Deltoid
3 Sub Sections

Posterior Deltoid
3 Sub Sections