Rhomboid muscle

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Rhomboid muscle
Muscles connecting the upper extremity to the vertebral column.
Latin musculus rhomboideus
Origin: nuchal ligaments, spinous processes of the C7 to T5 vertebrae
Insertion: medial border of the scapula
Artery: dorsal scapular artery
Nerve: dorsal scapular nerve (C4 and C5)
Action: Retracts the scapula and rotates it to depress the glenoid cavity. It also fixes the scapula to the thoracic wall.
Antagonist: Serratus anterior muscle

The rhomboid muscles, oftem simply called the rhomboids, are rhombus-shaped muscles associated with the scapula and are chiefly responsible for its retraction. There are two rhomboid muscles: