RHOMBOID MUSCLE

Synonyms

Latin: Musculi rhomboidei minores et majores
English: rhomboid major muscle and rhomboid minor muscle

Synergists: M. deltoideus, M. trapezius
Antagonists: M. pectoralis minor

definition

The small and large rhomboid muscles (musculus rhomboideus minor et major) form a four-sided, strongly developed muscle plate that is not externally recognizable because they are completely covered by the trapezius muscle.

course

Insertion: inner shoulder blade margin (margo medialis)

Origin:

Small rhomboid muscle: spinous processes of the 1st - 7th cervical vertebrae
Greater rhomboid muscle: spinous processes of the 1st - 4th thoracic vertebra

Innervation: N. dorsalis scapulae, plexus cervivalis C4-5

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Figure rhomboid muscle

Rhombus muscle - 1st + 2nd
(Musculus rhomboideus)

Rhombus Greater Muscle -
Rhomboideus major muscle
Lesser rhomboid muscle -
Rhomboideus minor muscle
Sixth cervical vertebra -
Vertebra cervicalis VI
Seventh cervical vertebra -
Vertebra prominent
First thoracic vertebra -
Vertebra thoracica I
Fourth thoracic vertebra -
Vertebra thoracica IV
Scapula bone -
Spina scapulae
Shoulder blade - Scapula
Inner edge (of the shoulder blade) - Margo medialis (Scapulae)
Upper arm shaft - Corpus humeri
Spine - Vertebral column
Spinous process (thoracic vertebra) - Spinous process

You can find an overview of all Dr-Gumpert images at: medical illustrations

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function

Both the large rhombus muscle and the small rhomboid muscle lift the shoulder blade upwards and in the center when tensed. They thus support the descending part of the in their effect Trapezius. In addition, the two rhombus muscles fix the shoulder blade to the trunk.