Back Of The Body And Scapular Region Notes

Back Of The Body And Scapular Region Notes

Question 1. Give a brief account of the posterior axio-appendicular muscles.
Answer.

• Axio-Appendicular Muscles are the muscles that attach the scapula to the back of the trunk.
• Axio-Appendicular Muscles  are arranged into two layers:
  • Superficial layer
    • Trapezius
    • Latissimus dorsi
  • Deep layer
    • Levator scapulae
    • Rhomboideus minor
    • Rhomboideus major

Back of the Body and Scapular Region Anatomy

“Understanding the anatomy of the back and scapular region”

Question 2. Give the origin, insertion, nerve supply and actions of the trapezius muscle.
Answer.

Trapezius Muscle Origin

The trapezius muscle arises from:

• The medial one-third of the superior nuchal line of the occipital bone.
• Ligamentum nuchae.
• Spinous processes and supraspinous ligaments from C7 to T12.

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Trapezius Muscle  Insertion

Trapezius Muscle  is inserted as follows:

• Superior fibres, into the lateral one-third of the posterior border of the clavicle.
• Middle fibres, into the medial margin of the acromion and upper lip of the crest of the spine of the scapula.
• Lower fibres, into the deltoid tubercle of the spine of the scapula.

Trapezius Muscle  Nerve Supply

• Spinal root of the accessory nerve
• Ventral rami of C3 and C4 spinal nerves

Scapular Region and Back of the Body Muscles and Structure

Read And Learn More: Selective Anatomy Notes, Questions, and Answers

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Trapezius Muscle  Actions

• Shrugging of the shoulder
• Retraction of scapula
• Rotation of the scapula to help abduction of the arm beyond 90°