Anatomy (Bones and Muscles) · MU Sofia

36 + 37 Back muscles

Covers the back muscles in two layers: the extrinsic superficial group, including trapezius, latissimus dorsi, the rhomboids, levator scapulae and the serratus posterior muscles, and the intrinsic group, including splenius, the erector spinae columns, the multifidi, rotatores and interspinales. Each muscle is given its origin, insertion, nerve supply, action and blood supply, often in tables, with mnemonics for the layers. It closes with the thoracolumbar fascia, its three lumbar layers and its functions.

Inside: 6 sections · 18 labelled pictures · 5 tables · 14 flashcards · 7 min

Topic 36 of 49 in the MU Sofia syllabus for Anatomy (Bones and Muscles) (Medicine, Years 1 and 2). The free AceMed note covers it in 6 sections, about 871 words (7 min of reading), with 14 flashcards.

In this note

  1. Introduction
  2. BACK MUSCLES
  3. Extrinsic /Superficial layer :
  4. Intrinsic muscles :
  5. THORACOLUMBAR FASCIA
  6. Functions :

Introduction

36 + 37

Extrinsic /Superficial layer :

superficial layer

" Ladies love Red Trains"

① Trapizues m.

  • N: Accessory nerve (XI) & spinal nerves C3-C4
  • B.S : Transverse cervical art.

② Latissimus dorsi

  • O :
  • → Spinous processes T7 - S5
  • → Thoracolumbar fascia
  • → iliac spine & iliac crest
  • → 10th - 12th ribs
  • → inferior angle of scapula
  • I : Humerus - crest of lesser tubercle.
  • N: Thoracodorsal nerve.
  • B.S : Thoracodorsal art.

③ Rhomboid minor

  • O: Spinous processes C6-C7
  • I : Scapula
  • N: dorsal scapular n.
  • F: elevation the scapula
  • B.S : Dorsal scapular art.

④ Rhomboid major

  • O : spi. p : T1-T4
  • I : Scapula
  • N : Dorsal scapular n.
  • F : elevation the scapula
  • B.S : Dorsal scapular art.

⑤ levator scapula m.

  • O : Transverse proce- : C1-C4
  • I : Scapula - supe. angle
  • N : spinal nerves + dorsal scapular n.
  • F : elevation of the scapula.
  • B.S : Dorsal scapular art.

⑥ Serratus post. superior

  • O : spinous process : C6-T2 (4)
  • I : 2nd - 5th ribs
  • N : intercostal n.
  • F : elevation of the ribs
  • B.S : post. intercostal art.

Intermediate muscles

⑦ Serratus post. infer. :

  • O : T11 - L2 (4)
  • I : 9th - 12th ribs
  • N : intercostal n.
  • B.S : Subcostal (branch of ant. intercostal) + upper lumber arteries.

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