Anatomy study note · Upper limb

Rhomboid major

A quadrilateral muscle from the upper thoracic spines to the medial border of the scapula, below rhomboid minor.

Key points

• T2–T5 spines → medial border below the spine.
• Dorsal scapular nerve (C4, 5).
• Retracts and elevates the scapula.
• Limb muscles: in situ from limb-bud mesenchyme.
• Upper limb bud C4–T2; lower limb bud L2–S2.
• Skeletal muscle: multinucleated, peripheral nuclei, striated.
• Epimysium → perimysium → endomysium.

The full note in the atlas also covers

Origin · Insertion · Action · Nerve supply · Histology · Development

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 3, PDF p. 302
• Inderbir Singh’s Human Embryology, ch. 7, PDF p. 109; ch. 10, PDF pp. 142–145
• BRS Cell Biology & Histology, 7th ed., ch. 8, PDF pp. 135–144

More from the upper limb

• Rhomboid minor
• Scapula
• Serratus anterior
• Shoulder joint
• Sternoclavicular joint
• Subclavius
• Subscapular nerves
• Subscapularis
• Supinator
• Suprascapular nerve
• Supraspinatus
• Supratrochlear (cubital) lymph node

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