Pectoral muscles lie in the chest and exert force through the shoulder to move the upper arm.
Which muscle of the trunk abducts the arm?
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 trunk extend the arm at the shoulder?
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.
What muscles are involved in trunk rotation?
Trunk rotation is a key risk factor for low back pain1,2). During rotation, the external oblique (EO), rectus abdominis (RA) and lumbar multifidus (MF) muscles act contralaterally, whereas the latissimus dorsi (LD), internal oblique (IO) and transversus abdominis (TrA) muscles act ipsilaterally3,4,5,6).
Which muscles are trunk muscles?
The muscles of the trunk include those that move the vertebral column, the muscles that form the thoracic and abdominal walls, and those that cover the pelvic outlet. The erector spinae group of muscles on each side of the vertebral column is a large muscle mass that extends from the sacrum to the skull.
How many trunk muscles are there?
Your abdominal muscles have many important functions, from holding organs in place to supporting your body during movement. There are five main muscles: pyramidalis, rectus abdominus, external obliques, internal obliques, and transversus abdominis.
What is supraspinatus muscle?
The supraspinatus muscle is located on the back of the shoulder, forming part of the rotator cuff. The rotator cuff consists of Supraspinatus, Infraspinatus, Subscapularis and teres minor. The rotator cuff covers the head of the humerus and keeps it into place. These muscles help to lift and rotate the arm.
What are the 3 shoulder muscles?
The deltoid muscle is the main muscle of the shoulder. It consists of three muscle heads: the anterior deltoid, lateral deltoid, and posterior deltoid.
What muscles are part of the shoulder girdle?
The five muscles that comprise the function of the shoulder girdle are the trapezius muscle (upper, middle, and lower), levator scapulae muscle, rhomboid muscles (major and minor), serratus anterior muscle, and pectoralis minor muscle.
What muscles are around the shoulder?
The most important shoulder muscles are the four rotator cuff muscles – the subscapularis, supraspinatus, infraspinatus and teres minor muscles – which connect the scapula to the humerus and provide support for the glenohumeral joint.
What are trunk twists?
This exercise stretches your back, spine, and upper torso muscles.
- Sit with your legs crossed.
- Reach your left hand toward your left foot, and place your right hand at your side for support.
- Slowly twist your torso to your right.
- Switch your hands and twist to your left.
- Repeat 2 to 4 times.
What are trunk exercises?
- The plank for trunk stability.
- Lifting the head when lying.
- Sitting up from lying at an age appropriate level.
- Sitting up from a pile of cushions.
- Sit backs.
- Sit-ups with legs straight.
- Sit-ups with knees bent.
- Kicking a big ball when lying on the back.
What are standing trunk twists?
The standing twist is the simplest trunk rotation exercise. Execution. Stand with the feet about shoulder width and hold a plate in both hands with the elbows at the sides and forearms horizontal. Rotate at the trunk powerfully to one side, keeping the feet planted solidly on the floor.
Where is trunk in human body?
The main part of the body that contains the chest, abdomen, pelvis, and back. Most of the body’s organs and the backbone are found in the trunk. Also called torso.
What is posterior trunk?
The posterior trunk roughly encompasses the upper back from the shoulders to the lumbar area above the iliac crests. Long-term outcomes in the treatment of defects of the spine and bony thorax have been proved superior if flaps were used.
What trunk muscle acts as an antagonist to the diaphragm?
The internal oblique performs two major functions. Firstly as an accessory muscle of respiration, it acts as an antagonist (opponent) to the diaphragm, helping to reduce the volume of the chest cavity during exhalation.