Corpus: Rhomboid major muscle
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from Latin: rhomboideus - diamond-shaped
Synonyms: Large rhomboid muscle, large rhomboid muscle
English:
Definition[Bearbeiten]
The greater rhomboid muscle is a diamond-shaped muscle that belongs to the middle layer of the secondary back muscles.
Course[Bearbeiten]
The rhomboid major muscle has its origin at the spinous processes (processus spinosi) of the 1st-4th (also: 2nd-5th) thoracic vertebral body and at the supraspinous ligament.
The fibres run laterally and caudally to the scapula (shoulder blade), where they find their insertion below the spina scapulae at the medial edge (margo medialis) of the bone.
Innervation[Bearbeiten]
The greater rhomboid muscle is innervated by the dorsal scapular nerve, a branch of the brachial plexus (segments: C5, with parts from the neighbouring segments C4 and sometimes also C6).
Function[Bearbeiten]
The rhomboid major muscle fixes the scapula to the trunk. When contracted, it lifts the scapula cranially and medially. It is supported by the rhomboideus minor muscle.