Your deltoid muscles make up a main muscle group in your upper body. They’re connected with many other muscles and bones in your upper back, neck, and shoulder region and are extremely mobile.

The ball-and-socket structure of your shoulder and arm is an intricate arrangement of muscles, tendons, and bone. Injuries to the rotator cuff are common, but treatment is often successful.

The rotator cuff is a set of muscles that helps the arm and shoulder move. Injuries to the rotator cuff are fairly common, but many effective treatments are available. These muscles work together ...

Shoulder pain can be a real pain, but what if the pain isn't what it seems? Sometimes shoulder pain isn't really about your ...

It’s worth noting that most, but not all, vaccines are given in the muscle – this is known as an intramuscular injection. Some vaccines, like the rotavirus vaccine, are given orally.

Why it rocks: This challenging move works the rear delts along with many other muscles. Renegade rows are great to include because the rear delts act as stabilizer muscles. How to: Set up your ...

Human shoulder development is adapted to obstetrical constraints. Proceedings of the National Academy of Sciences, 2022; 119 (16) DOI: 10.1073/pnas.2114935119 ...