M. Latissimus dorsi

Origin

  • Thoracolumbala fascia
  • Sacrum
  • Crista iliac
  • Processus spinosus
  • Th6-L5
  • Costae 9-12

Attachment

  • Angulus inferior scapulae
  • Crista tuberculi minoris humeri

Innervation

  • C6-C8 N. Thoracodorsalis

Plexa

  • Pl. Brachialis

Function

Bilateral function

  • Increases lordosis in lumbar spine
  • Extension of the torso

Unilateral function

  • Extension art. humeri
  • Adduction art. humeri
  • Inward rotation art. humeri
  • Depression of the shoulder
  • Adduction of scapulae
  • Lateral flexion of trunk
  • Ipsilateral rotation of torso

Artery

Antagonist

Joints involved

  • art. Humeri
  • Intervertebral joints Th6-L5
  • art. Thoracoscapularis

Descriptive text

Latissimus originates via the thoracolumbar fascia and then extends over the scapulae and then attaches to the inside of the humerus. The muscle itself is wide, flat and a superficial muscle. It covers a large part of the lower and middle part of the back and mainly affects the torso movements when it is extended (when art. Humeri is flexed and abducted).

Exercise

Exercise suggestions

Therapist tips

  • Trigger points in latissimus can cause pain in the arm and little finger side

Treatment recommendations

  • Massage in various forms
  • Acupressure
  • Dry needling
  • Joint manipulation
  • Stretch (both at home and from a therapist)
  • TENS
  • NMES
  • Cervical traction
  • Heat

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