Rhomboideus Major, Posterior View

Description

Centered on the posterior thorax of an adult male, the scapulae sit lateral to the thoracic spinous processes while the vertebral column runs in the midline from the cervical region into the upper lumbar levels. Deep to the scapular region, the serratus posterior superior is highlighted bilaterally, spanning inferolaterally from the lower cervical and upper thoracic vertebrae toward ribs 2 through 5 near their angles. Costovertebral joints and posterior ribs frame the muscle slips, with the medial borders of the scapulae lying superficial and lateral to the segmental attachments. Serratus posterior superior is often taught as an accessory respiratory muscle, but this posterior view makes its real-world relevance clearer in the differential for upper thoracic and interscapular pain, where symptoms can mimic cervicothoracic facet referral or scapulothoracic bursitis. Its relationship to the erector spinae mass and rib angles matters during posterior thoracic approaches and when interpreting trigger points or myofascial pain patterns in the parascapular region. Small muscle, common source of confusion. Educators can drop this plate directly into back anatomy labs to distinguish deep extrinsic back muscles from scapulohumeral layers such as rhomboideus minor and rhomboideus major, and to anchor rib numbering at the posterior angles. It also suits respiratory mechanics lectures, osteopathic manual medicine references, and surgical orientation diagrams for posterior chest wall exposure. Anatomical accuracy verified by SciePro's Medical Advisory Board.