Scapular Elevation and Depression Anatomy Quiz

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Questions and Answers

Which muscles are primarily involved in scapular elevation?

Levator scapulae (correct)

Upper fibers of trapezius (correct)

Rhomboids major and minor

Pectoralis minor

What is the range of motion for full scapular elevation?

No separation from the ear

Approximately 3 fingers separating from the ear (correct)

Two fingers separating from the ear

One finger separating from the ear

What is a limiting factor of scapular elevation range of motion?

Tension of costo-clavicular ligament (correct)

Strength of the levator scapulae

Tension of upper trapezius

Flexibility of the rotator cuff

What is the action of the upper fibers of the trapezius during bilateral action?

Elevation of the scapula Signup and view all the answers

Which of the following describes the insertion point of the levator scapulae?

Medial border of scapula between superior angle and root of spine Signup and view all the answers

What effect does weakness in scapular elevator muscles have?

Compensatory shoulder movements Signup and view all the answers

Which nerve supplies the upper fibers of trapezius?

Accessory nerve Signup and view all the answers

Which muscle is not primarily involved in scapular depression?

Levator scapulae Signup and view all the answers

Which muscles are primarily responsible for scapular elevation?

Upper fibers of trapezius and levator scapulae Signup and view all the answers

What is the approximate distance when the shoulder is fully elevated in terms of fingers from the ear?

3 fingers Signup and view all the answers

What is a limiting factor for the range of motion during scapular elevation?

Tension of costo-clavicular ligament Signup and view all the answers

Which nerve innervates the upper fibers of trapezius?

Accessory nerve (11 cranial nerve) Signup and view all the answers

What action is performed by the upper fibers of trapezius when acting unilaterally?

Lateral flexion and rotation of the head Signup and view all the answers

Which muscle group assists in scapular depression?

Lower fibers of trapezius and pectoralis minor Signup and view all the answers

What would likely be an effect of weakness in scapular elevator muscles?

Difficulty in overhead activities Signup and view all the answers

Which of the following muscles is NOT involved in scapular elevation?

Pectoralis major Signup and view all the answers

Study Notes

Scapular Elevation and Depression

Objectives: Students will learn to identify the muscles involved in scapular elevation and depression, describe their range of motion, and understand the effects of weakness in these muscles.
Content: The content covers the anatomy of muscles involved in elevation and depression of the scapula, their range of motion, and effects of weakness in these muscles.

Scapular Elevation Muscles

Primary Muscles: Upper fibers of trapezius and levator scapulae.
Range of Motion: Shoulder is lifted up approximately 3 fingers' width from the ear.
Limiting Factors: Costo-clavicular ligament tension and tension in muscles depressing the scapula (pectoralis minor, subclavius, lower fibers of trapezius).

Anatomy of Trapezius (Upper Fibers)

Origin: External occipital protuberance, medial 1/3 of superior nuchal line, and ligamentum nuchae; spinous process of C7 vertebra.
Insertion: Lateral 1/3 of clavicle, acromion process.
Nerve Supply: Accessory nerve (cranial nerve XI), anterior rami of C2, C3 and C4.
Action (Bilateral): Elevates scapula, extends cervical spine.
Action (Unilateral): Extends, laterally flexes and rotates head/neck to the opposite side.

Anatomy of Levator Scapulae

Origin: Transverse processes of C1-C4 vertebrae.
Insertion: Medial border of scapula between superior angle and root of spine.
Nerve Supply: Dorsal scapular nerve.
Action (Bilateral): Extends cervical spine, elevates scapula.
Action (Unilateral): Rotates and laterally flexes cervical vertebrae on same side.

Scapular Depression

Primary Muscles: Lower fibers of trapezius, middle fibers of trapezius (accessory).
Range of Motion: Depression is equivalent to 3-4 fingers.

Limiting Factors of Range of Motion

Tension of interclavicular ligament, articular disc of sternoclavicular joint, tension in trapezius (upper fibers), levator scapulae and sternocleidomastoid (clavicular head).

Anatomy of Trapezius (Lower Fibers)

Origin: Spinous processes of T6-T12.
Insertion: Apex of spine of scapula.
Nerve Supply: Accessory nerve (cranial nerve XI), Anterior rami of C2, C3, and C4.
Action: Depresses scapula and stabilizes when middle/upper fibers are working.

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Description

This quiz focuses on the muscles involved in scapular elevation and depression, including their anatomy, range of motion, and implications of muscle weakness. Students will gain a deeper understanding of the trapezius and levator scapulae muscles and how they function in shoulder movement.