Anatomy for MRCEM primary exam

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Upper limb Anatomy

Latissimus Dorsi muscle

Surface markings, actions and nerve supply of Latissimus Dorsi

OriginIliac crest, Lumbar fascia, spines of T7-L5, lower 3-4 ribs and inferior angle of scapula
InsertionBicipital groove of Humerus
Nerve supplyThoracodorsal nerve C6-8
ActionsExtension, Adduction and medial rotation of the arm 

Latissimus dorsi Origin and Insertions – Image modified from BodyParts3D, © The Database Center for Life Science licensed under CC Attribution-Share Alike 2.1 Japan

When it comes to insertion, it goes in front of the Humerus and attaches at bicipital groove (groove between 2 crests that extend from greater and lesser tubercles). Teres major attaches at medial / lesser crest (lip) and Pectoralis major attaches at greater/lateral crest (lip). To help remember, use “Lady between two majors”.

All the actions are involved when you try to do reverse prayer namaskar pose.

Check previous lesson for Trapezius and Next lesson for Serratus anterior.