What is the main function of latissimus dorsi muscle?
Latissimus dorsi works collaboratively with the teres major and pectoralis major to perform actions of the upper extremity. Together, these muscles will work to adduct, medially rotate and extend the arm at the glenohumeral joint.
What is the action and innervation of the latissimus dorsi?
Due to the multidirectional alignments of its fibers, the latissimus dorsi muscle exhibits three actions on the shoulder joint: It effectively extends the flexed arm. It adducts and internally rotates the arm. If the humerus is fixed against the scapula, it pulls the pectoral girdle backward as a whole.
What movement does the latissimus dorsi?
The latissimus dorsi is responsible for extension, adduction, transverse extension also known as horizontal abduction (or horizontal extension), flexion from an extended position, and (medial) internal rotation of the shoulder joint.
What is the synergist of the latissimus dorsi?
Pelvic Movement. As the latissimus dorsi also inserts at the iliac crest of the pelvis, it acts as a synergist in the anterior (forward) and lateral (to the side) pelvic tilt.
Why is it called latissimus dorsi?
The latissimus dorsi muscle, whose name means “broadest muscle of the back,” is one of the widest muscles in the human body.
What type of muscle is the latissimus dorsi?
type V muscle
Latissimus dorsi is a type V muscle with a single dominant and long vascular pedicle from the thoracodorsal artery at its insertion.
What is the innervation of pectoralis major?
The pectoralis major receives dual motor innervation by the medial pectoral nerve and the lateral pectoral nerve, also known as the lateral anterior thoracic nerve. The sternal head receives innervation from the C7, C8 and T1 nerve roots, via the lower trunk of the brachial plexus and the medial pectoral nerve.
What is the action of the latissimus dorsi muscle quizlet?
Palpation: Latissimus dorsi and theres major both compromise the posterior portion of the axilla and can be palpated together at the posterior axillary fold. Action: Lateral Rotation, aDDuction and Extension of the arm.
What is the action of the pectoralis major?
The main function of this chest muscle as a whole is the adduction and internal rotation of the arm on the shoulder joint. Acting independently, the clavicular part helps to flex the extended arm up to 90°, while the sternocostal part facilitates the extension of the flexed arm by pulling it downwards.
What is a synergist of the rectus abdominis?
rectus abdominis. external intercostal synergist. internal intercostal. erector spinae action. extends and rotates vertebral column and head.
What is synergist muscle?
Synergist muscles also called fixators, act around a joint to help the action of an agonist muscle. Synergist muscles can also act to counter or neutralize the force of an agonist and are also known as neutralizers when they do this.