An extension is when you move your arms and stick them out behind you. The muscles involved in the flexion movement include the anterior deltoid, pectoralis major and coracobrachialis. For a shoulder extension, your body uses the latissimus dorsi, teres major and minor and posterior deltoid muscles.
Which muscles extend the arm?
This muscle, usually referred to as your triceps, runs along your humerus and allows for the flexion and extension of your forearm. It also helps to stabilize your shoulder joint.
What muscles of the trunk extend the arm at the shoulder quizlet?
Terms in this set (14)
- deltoid. large, rounded, triangular shoulder muscle.
- deltoid anterior fibers. flex and medially rotate arm.
- deltoid lateral fibers. abduct arm.
- deltoid posterior fibers. extend and laterally rotate arm.
- pectoralis major. …
- action of pectoralis major. …
- infraspinatus. …
- action of infraspinatus.
Which muscle adducts and extends the arm at the shoulder?
Attachments: The latissimus dorsi originates from the lower spine and ribs and the upper pelvis and fascia of the deep trunk muscles. The muscle converges into a tendon attaching to the humerus. Actions: Extends, adducts, and medially rotates the upper arm.
What is extension of the shoulder?
Extension of the shoulder relates to the free movement of the upper arm lowering from a raised position in front of the body allowing the entire extremity to return to a normal resting posture at the waist and continuing behind the body permitting limited movement of the arm behind the back.
What is the muscle under your armpit called?
Along with the pectoralis major and pectoralis minor, the subclavius muscle forms the axilla or armpit.
What muscles lift the arm above the head?
Your rotator cuff is made up of muscles and tendons that keep the ball (head) of your upper-arm bone (humerus) in your shoulder socket. It also helps you raise and rotate your arm. Each one of these muscles is part of the rotator cuff and plays an important role: Supraspinatus.
What muscles depress and protract shoulder?
Depression is accomplished through the force of gravity and the actions of the latissimus dorsi, serratus anterior, pectoralis major and minor, and the trapezius muscles. Upward rotation is accomplished by the trapezius and serratus anterior muscles.
What muscle raises your shoulder?
The supraspinatus muscle originates from the supraspinous fossa of the scapula, passes under the acromion, and inserts on the superior facet of the greater tubercle of the humerus. It is responsible for the initiation of arm abduction and is in control of the motion up to the first 15 degrees of abduction.
What muscles of the Brachium extend the forearm at the elbow?
Two muscles – the triceps brachii and anconeus – act as the extensors of the forearm. The triceps brachii is a long muscle that runs posterior to the humerus from the scapula to the olecranon of the ulna.
Can you overuse your arm?
Use equipment that is right for your size, strength, and ability. Try not to overuse your arm doing repeated movements that can cause an injury. In your daily routines or when doing hobbies, think about how often you make repeated arm movements. Try to find other ways of using your arms.
Which 2 muscles laterally rotate the arm humerus at the shoulder joint?
The infraspinatus and teres minor both aid in lateral, or external, rotation of the arm at the shoulder.
What is the largest muscle in the body?
The gluteus maximus is the largest muscle in the human body. It is large and powerful because it has the job of keeping the trunk of the body in an erect posture. It is the chief antigravity muscle that aids in walking up stairs. The hardest working muscle is the heart.
What is the prime mover for shoulder extension?
Muscles that have their origins in the posterior (back of) shoulder joint extend the arm. These muscles include the latissimus dorsi and posterior fibres of the deltoids, with both acting as the prime mover. Teres major also assists this action. Pectoralis major and latissimus dorsi act as antagonists.
How do you do shoulder extension?
Shoulder extension: Lie on a hard table on your stomach. Let your arms hang off the side. Hold a weight in both hands with your palms facing toward your body. Keep your arms straight and slowly raise your arms parallel to the floor in a “Y” shape.
How can I extend my shoulders?
Exercises for wider shoulders
- Sit on the edge of a bench with dumbbells at your side.
- Bend forward and rest your torso on your thighs.
- Keep your back flat.
- Slowly lift the weights up and to the side until your elbows are at shoulder height.
- Slightly bend your elbows and tilt your hands forward as you do this.