Teres Major – Lat’s Big Brother

The teres major is a muscle that often does not get the respect it deserves because it is next to the more well-known latissimus dorsi (lat). The lat might cover a larger surface area of the body, but in the posterior axillary fold of tissue, the teres major is actually quite a bit larger than the lat. For this reason, I like to call the teres major “the lat’s big brother”.

Coracobrachialis: Attachments, Functions, Palpation & Treatment

The coracobrachialis is a muscle in the anterior compartment of the upper arm. It originates on the coracoid process of the scapula and inserts on the medial shaft of the humerus. It performs flexion and adduction at the glenohumeral joint and serves as a key teaching muscle for core kinesiology concepts including open-chain vs. closed-chain movement, cardinal-plane vs. oblique-plane motion, and anatomic vs. non-anatomic actions.

Acromion Process and Head of Humerus. Permission Joseph E. Muscolino. Kinesiology - The Skeletal System and Muscle Function, 3rd ed. Elsevier, 2017).

Six Causes of Shoulder Impingement Syndrome – Part 3

Another reason for shoulder impingement syndrome to occur is insufficient elevation of the clavicle. Most of scapular upward rotation is actually caused by elevation of the clavicle at the sternoclavicular joint, so if clavicular elevation is prevented for any reason, shoulder impingement syndrome can occur.

The Pectoralis Minor. Permission Joseph E. Muscolino. The Muscular System Manual - The Skeletal Muscles of the Human Body, 4th ed. (Elsevier, 2017).

Six Causes of Shoulder Impingement Syndrome – Part 2

For scapular upward rotation to occur, scapular downward rotator musculature must lengthen. If scapular downward rotation muscles are tight, they might not be flexible enough to allow for scapular upward rotation, thereby causing shoulder impingement syndrome to occur.