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