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Vertebral Levels😍

Vertebral Levels

C3 Level

  • Hyoid bone
  • 3 → Hai

C4 Level

  • Bifurcation of the common carotid artery
  • Thyroid cartilage
      • 4 → always Bifurcation
        • T4 → bifurcation of CCA
          • + Thyroid cartilage
        • L4 → bifurcation of Abdominal aorta
          • + LP
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  • Extends from C5 to T1 vertebral level
    • A- C5
    • B- C6
    • C- C7
    • D- T1
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C6 Level

  • Cricoid cartilage
  • Trachea begins (end of larynx)
  • Esophagus begins (end of pharynx)
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Sibson's Fascia

  • Also known as suprapleural membrane.
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  • Remnant of scalenus minimus.
  • From 1st Rib to C7 Vertebrae
  • SibsOne → Seven to One

T1 Level

  • Sternoclavicular joint

T2 Level

  • Superior angle of scapula
  • Suprasternal notch
      • Scapula superior angle → C2
      • Scapula inferior angle → T7 > 8
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T4 Level

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  • Thoracic plane or plane of Ludwig
  • Sternal angle of Louis (marked) (T4-T5)
  • Arch of aorta (T3-T4)
  • Bifurcation of trachea (carina)
  • Division between superior and inferior mediastinum
  • Azygos vein drains into SVC
  • Dermatome of Nipple
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  • ”Mneumonic:
    • Ludwig and Loius had asha (Azygous) for Archa (after seeing her nipple). At 4, Archa (Arch of aorta) told Louis (angle of Louis) is inferior to Ludwig (superior and inferior mediastinum) , so they bifurcated at base of a tree (Bifurcation of trachea )

T8 Level

  • IVC hiatus
  • Inferior angle of the scapula (T7-T8)
      • Scapula superior angle → C2
      • Scapula inferior angle → T7 > 8
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T9 Level

  • Xiphisternal joint

T10 Level

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  • Oesophageal hiatus
  • Marked level → T10 (count down from Nipple)

T12 Level

  • Aorta hiatus
  • T12 vertebra → Posterior of Epiploic foramen

Mneumonic:

  • I (IVC) ate (T8) 10 (T10)eggs (esoph) at (aorta) 12(T12)
    • T8 → I’m (IVC) the Right Person (right phrenic)
    • T10 → Very (Vagus) Easy (esophagus) Going (Gastric)
    • T12 → And (Aorta) Truthful (thoracic)
Opening of Diaphragm
Level
Structures Passing Through
On inspiration
Caval opening

In the central tendon
T8
IVC,
Right phrenic nerve
(Inferior angle of the scapula (T7-T8))
Dilatation (VR↑)
Esophageal opening

Surrounded by the (R) crus of the diaphragm
T10
Esophagus,
Vagus nerves (R & L),
Esophageal branch of left gastric artery
Constriction

Contraction of diaphragm
"Pinchcock" action:
→ Closes esophageal opening
Aortic opening

= b/w crus
T12
Aorta,
Thoracic duct,
Azygos vein,
sometimes Hemiazygos vein
No change

(lies behind diaphragm)

L1 Level

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Celiac Trunk
Lower border of T12
Superior Mesenteric Artery
Lower border of L1
Inferior Mesenteric Artery
Body of L3
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Mnemonic: Common (CIA) Inferior People (Inf phre) are Ready (rena) to Go (gona) Middle (middle supra) east
Mneumonic:
  • Pyli → Pylorus
    • Funda →Fundus
    • 9 → 9th CC tip
    • Smokes → SMA
    • Drunk kili→ Trunk Celiac
    • climb Hill → Hilum
  • So Pyli ne Veetukar Addich (Addisons Plane)

L2 Level

  • Renal veins
  • Thoracic duct begins
  • Portal Vein formed (from SMV and Splenic Vein)
  • Azygos and hemiazygos begin
  • Mnemonic: L2 → too large → Thoracic duct

L3 Level

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  • Umbilicus
  • Inferior Mesenteric Artery
  • Spinal cord ends in children in upper border
  • Subcoastal Plane (at lower border)
  • Mnemonic: U (Umbilicus), I’m A (IMA) child (Spinal cord) in Coastal () area
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L4 Level

  • Iliac crest
  • Bifurcation of abdominal aorta into left and right common iliac arteries
  • Lumbar Puncture (L4-L5)
  • Mnemonic:
      • 4 → always Bifurcation
        • T4 → bifurcation of CCA
          • + Thyroid cartilage
        • L4 → bifurcation of Abdominal aorta
          • + LP
    • L4 → remember LumBar puncture → LB → iLeac Crest, Bifurcation

L5 Level

  • IVC formed (convergence of right and left common iliac veins)
  • Transtubercular plane (at upper border of L5)

S1 Level

  • Sacral promontory
  • Mnemonic: PromOnetory → S1

S2 Level

  • Posterior superior iliac spine
  • Dural sac ends
  • Mnemonic: S2 → Dual Pieces (Dural sac, PSIS)