LITFL » Exams » ACEM Primary Examination » Muscles

Muscles

MuscleOriginInsertionActionBloodNerve
Trapezius
  • external occipital protuberance
  • medial 1/3 of the superior nuchal line
  • ligamentum nuchae (surrounding the cervical spinous processes)
  • spinous processes of C1-T12
  • posterior, lateral 1/3 of the clavicle
  • medial margin of the acromion
  • superior spine of the scapula
  • elevates scapula and
  • upwardly rotates the scapula (upper portion) (note: the glenoid fossa is the reference for scapular rotation)
  • retracts scapula (all)
  • downwardly rotates the scapula (lower portion)
transverse cervical artery
  • motor: spinal accessory (XI cranial)
  • sensory: ventral ramii of C3 & C4 (possibly C2)
Latissimus dorsi1. spinous process of T7-L52. supraspinous ligament

3. upper 2-3 sacral segments

4. iliac crest

5. lower 3 or 4 ribs

6. inferior angle of the scapula

floor of the bicipital groove of the humerusa portion of the crest of the lesser tubercle

(the bicipital groove is also known as the intertubercular groove)

1. extends the arm (from a flexed position)2. internally (medially) rotates the arm

3. adducts the arm

4. downwardly rotates the scapula

thoracodorsal arterythoracodorsal nerve, C6,7,8
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About Mike Cadogan

Emergency physician with a passion for medical informatics and medical education. Co-founder of HealthEngine, iMeducate, and the GMEP. He writes more eclectically on the web as @sandnsurf | + Mike Cadogan | Contact