Back and Spinal Cord

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14 Topographic Anatomy

STUDYAIMS

At the end of your study, you should be able to:

Identifyposteromedian furrow

Identifyexternal occipital protuberance, vertebra prominens, iliac crests, posterior superior iliac spines

Identifydeltoid, latissimus dorsi, trapezius, erector spinae, teres major, infraspinatus, gluteus maximus, and medius Identifymargins of scapula

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GUIDE

Back and Spinal Cord: Topographic Anatomy

[Plate 149, Topographic Anatomy]

Median line of back: posteromedian furrow overlies tips of spinous processes

Deepest in lower thoracic/upper lumbar region

Bordered byerector spinae

Vertebra prominens = C7 spinous process (T1 may be more prominent) Scapula:

Superior angle at the level of T2

Medial end of scapular spine opposite spinous process of T3

Inferior angle at level of T7

Medial border of scapula parallels the sixth rib and approximates oblique fissure of lung when the arm is abducted byplacing the hand on the head

Iliac crests at level of L4 = supracristal line

S2 spinous process lies level with a line joining the posterior superior iliac spines Tip of coccyxapproximately2.5 cm posterosuperior to the anus

Anatomy of muscles of the back are covered in Section 2-4: Back and Spinal Cord-Muscles and Nerves. (Muscles that are readily visible are trapezius, latissimus dorsi, and teres major).

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[Plate 160, Sympathetic Nervous System: Schema]

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[Plate 161, Parasympathetic Nervous Sytem: Schema]

Vertebrae and corresponding structures

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