Pectoralis major and latissimus dorsi act as antagonists. The middle region of the deltoid muscle is the prime mover for arm abduction. The pectoralis major acts as an antagonist to the middle deltoid anteriorly, whilst the latissimus dorsi acts as the antagonist posteriorly.
What is a synergist of the latissimus dorsi?
2 It extends, adducts and medially rotates the humerus at the shoulder; draws the inferior angle of the scapula inferior and medial (draws shoulder downward and backward). The synergistic muscles are rhomboids, pectoralis major, teres major. Variation in the muscle in the latissimus dorsi is not uncommon.
What is the action of the 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 happens when the latissimus dorsi contracts?
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 is the antagonist of Sternocleidomastoid?
The sternocleidomastoid muscles help to flex the neck. Their antagonists are the longus capitis and the rectus capitis anterior.
What is the antagonist and synergist of the Sternocleidomastoid?
Antagonists – platysma, digastric. Synergists – temporalis. Sternocleidomastoid. Action – flexes and laterally rotates head. Origin – manubrium and clavical.
Which of the following is not an action of the latissimus dorsi?
Lateral (external) rotation of the arm at the shoulder is NOT an action created by the latissimus dorsi as this action is caused by the teres minor muscle.
Which muscles do pull-ups work?
Pullups use your lats and biceps primarily, while also recruiting your deltoids, rhomboids, and core. These are the muscles you’ll need to strengthen. We’ve curated five exercises as a starting point to train for pullups.
What muscles do push ups work?
In the standard pushup, the following muscles are targeted:
chest muscles, or pectorals.shoulders, or deltoids.back of your arms, or triceps.abdominals.the “wing” muscles directly under your armpit, called the serratus anterior.
What is the antagonist to the biceps Brachii?
The biceps brachii is responsible for flexion of the forearm, while the triceps brachii is responsible for the extension of the forearm. As a result, we say that the triceps brachii is the antagonist of the biceps brachii.
What is the gluteus minimus antagonist?
Anatomical Parts
Medial rotation of thigh. Antagonist: Lateral rotator group. Description: The Glutaeus minimus, the smallest of the three Glutaei, is placed immediately beneath the preceding.
What are antagonist muscles?
In an antagonistic muscle pair as one muscle contracts the other muscle relaxes or lengthens. The muscle that is contracting is called the agonist and the muscle that is relaxing or lengthening is called the antagonist.
