Body Parts And Anatomy
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Anatomy of the Shoulder Muscles
Muscular Anatomy
The Deltoid is a three headed muscle that caps the shoulder.
Anatomy | Muscles | Bodybuilding | Fitness | Stretching
The three heads of the Deltoid are the Anterior, Lateral, and Posterior.
All three Deltoid heads attach to the humerus. The Anterior and Lateral heads originate on the collar bone, while the Posterior head originates on the scapula.
The Anterior Delt contributes to many Pec-related movement, e.g. bench press. The Lateral Delt is most active in dedicated lateral movements. The Posterior Delt is often activated in back exercises that involve the Teres Major and Rhomboid muscles.
The function of the Deltoid muscle is essentially to move the arm away from the body.
The Anterior head raises it away to the front, the Lateral head up and away to the side and the Posterior head away to the rear.
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Comments
deltoid muscle action
By A. Allan
The anterior fibres are involved in shoulder abduction when the shoulder is externally rotated. The anterior deltoid is weak in strict transverse flexion but assists the pectoralis major during shoulder transverse flexion / shoulder flexion (elbow slightly inferior to shoulders).
The exterial fibres are strongly involved in transverse extension particularly since the latissimus dorsi is very weak in strict transverse extension. The posterior deltoid is also the primary shoulder hyperextensor.
The lateral fibres are involved in shoulder abduction when the shoulder is internally rotated, are involved in shoulder flexion when the shoulder is internally rotated, and are involved in shoulder transverse abduction (shoulder externally rotated) - but are not utilized significantly during strict transverse extension (shoulder internally rotated).

Deltoid Exercises to build wide shoulders
By Diego
The basic function of shoulder muscles is to rotate and lift the arm.
 
Nothing gives a better look than broad, round, well-developed shoulder muscles. Shoulders are the most widely noticeable part of anyone's physique. Well developed shoulders demand attention.
 
When it comes to best shoulder exercises power moves takes the show. Power exercises like clean and press and heavy upright rows will build strong muscular shoulder muscles.
 
Remember shoulder muscles are involved in many other movements like chest press, Deadlifts and bent-over rows and therefore strong shoulder muscles are an absolute requirement to go all out on such moves.
Muscles Safety
Training tips
  • Maintain your ideal body weight. The more you weigh, the more stress you are putting on your joints, especially your hips, knees, back and feet.
  • Move your body. Exercise protects joints by strengthening the muscles around them. Strong muscles keep your joints from rubbing against one another, wearing down cartilage. We can help you get started on an exercise program that works for you.
  • Stand up straight. Good posture protects the joints in your neck, back, hips and knees.
  • Pace yourself. Alternate periods of heavy activity with periods of rest. Repetitive stress on joints for long periods of time can accelerate the wear and tear that causes osteoarthritis.
  • Listen to your body. If you are in pain, don't ignore it. Pain after activity or exercise can be an indication that you have overstressed your joints.
  • Don't be static. Changing positions regularly will decrease the stiffness in your muscles and joints.
  • Forget the weekend warrior. Don't engage in activities your body for which your body isn't prepared. Start new activities slowly and safely until you know how your body will react to them. This will reduce the chance of injury.
  • Wear proper safety equipment. Don't leave helmets and wrist pads at home. Make sure you get safety gear that is comfortable and fits appropriately.
  • Ask for help. Don't try to do a job that is too big for you to handle. Get another pair of hands to help out.

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