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Questions and Answers
Which of the following is the only rotator cuff muscle that inserts on the lesser tubercle of the humerus?
Which of the following is the only rotator cuff muscle that inserts on the lesser tubercle of the humerus?
Which of the following nerves innervates the teres minor muscle?
Which of the following nerves innervates the teres minor muscle?
Which of the following rotator cuff muscles is responsible for the initial abduction of the arm?
Which of the following rotator cuff muscles is responsible for the initial abduction of the arm?
Which of the following nerves innervates the subscapularis muscle?
Which of the following nerves innervates the subscapularis muscle?
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Which of the following rotator cuff muscles is responsible for external rotation of the arm?
Which of the following rotator cuff muscles is responsible for external rotation of the arm?
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Which of the following muscles works synergistically with the deltoid to abduct the arm?
Which of the following muscles works synergistically with the deltoid to abduct the arm?
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Which of the following nerves innervates the teres major muscle?
Which of the following nerves innervates the teres major muscle?
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Which of the following rotator cuff muscles is responsible for internal rotation of the arm?
Which of the following rotator cuff muscles is responsible for internal rotation of the arm?
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Which of the following nerves innervates the supraspinatus muscle?
Which of the following nerves innervates the supraspinatus muscle?
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Which of the following rotator cuff muscles is responsible for adduction of the arm?
Which of the following rotator cuff muscles is responsible for adduction of the arm?
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Which nerve is responsible for innervating the trapezius muscle?
Which nerve is responsible for innervating the trapezius muscle?
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Which of the following muscles is a primary adductor of the shoulder?
Which of the following muscles is a primary adductor of the shoulder?
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Which muscle is responsible for medial rotation of the arm in the vertical plane?
Which muscle is responsible for medial rotation of the arm in the vertical plane?
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Which muscle is the main climbing muscle, along with the sternocostal part of the pectoralis major, teres major, and posterior part of the deltoid?
Which muscle is the main climbing muscle, along with the sternocostal part of the pectoralis major, teres major, and posterior part of the deltoid?
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Which nerve innervates the levator scapulae, rhomboid major, and rhomboid minor muscles?
Which nerve innervates the levator scapulae, rhomboid major, and rhomboid minor muscles?
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What is the primary function of the rhomboid major and minor muscles when acting bilaterally?
What is the primary function of the rhomboid major and minor muscles when acting bilaterally?
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Which muscle is responsible for elevating the glenoid cavity of the scapula when acting unilaterally?
Which muscle is responsible for elevating the glenoid cavity of the scapula when acting unilaterally?
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Which muscle is responsible for extending the arm in the coronal plane?
Which muscle is responsible for extending the arm in the coronal plane?
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Which muscle is a synergist to the rhomboid major and minor muscles in rotating and depressing the scapula?
Which muscle is a synergist to the rhomboid major and minor muscles in rotating and depressing the scapula?
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Which muscle is an antagonist to the rhomboid major and minor muscles in elevating the glenoid cavity of the scapula?
Which muscle is an antagonist to the rhomboid major and minor muscles in elevating the glenoid cavity of the scapula?
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Which of the following is the primary function of the superior part (descending fibers) of the trapezius muscle?
Which of the following is the primary function of the superior part (descending fibers) of the trapezius muscle?
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Which of the following muscles is primarily responsible for retracting the scapula?
Which of the following muscles is primarily responsible for retracting the scapula?
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Which of the following muscles is primarily responsible for depressing the scapula?
Which of the following muscles is primarily responsible for depressing the scapula?
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Which of the following muscles is innervated by the dorsal scapular nerve?
Which of the following muscles is innervated by the dorsal scapular nerve?
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Which of the following muscles is considered part of the rotator cuff?
Which of the following muscles is considered part of the rotator cuff?
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Which of the following muscles is responsible for assisting in the suspension of the upper limb?
Which of the following muscles is responsible for assisting in the suspension of the upper limb?
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Which of the following muscles is primarily responsible for rotating the scapula upwards?
Which of the following muscles is primarily responsible for rotating the scapula upwards?
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Which of the following muscles is innervated by the spinal accessory nerve?
Which of the following muscles is innervated by the spinal accessory nerve?
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Which of the following muscles is considered a synergist to the rotator cuff muscles?
Which of the following muscles is considered a synergist to the rotator cuff muscles?
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Which of the following muscles is responsible for elevating the scapula?
Which of the following muscles is responsible for elevating the scapula?
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Study Notes
Trapezius and Accessory Nerve
- Trapezius muscle innervated by spinal part of accessory nerve (XI th cranial nerve)
- Also innervated by C3-C4
Latissimus Dorsi
- Origin: spinous processes of T7-L5, thoracolumbar fascia, and iliac crest
- Insertion: floor of the intertubercular groove, crest of lesser tubercle
- Functions:
- Adduction, medial rotation, and extension of the arm
- Assist in inspiration and expiration
- Climbing muscle
Levator Scapulae
- Origin: transverse processes of C1-C4
- Insertion: superior angle of scapula
- Innervation: dorsal scapular nerve
- Function: elevation of the scapula, rotating it downward, and depressing the glenoid cavity
Rhomboid Muscles
- Rhomboid minor and major muscles retract and rotate the scapula, depressing the glenoid cavity
- Innervation: dorsal scapular nerve
- Origin: C7-T1 (rhomboid minor), T2-T5 (rhomboid major)
- Insertion: medial border of scapula
Trapezius Muscle
- Origin:
- Superior part: superior nuchal line, ligamentum nuchae, C7 vertebra
- Middle part: spinous processes of thoracic vertebrae, supraspinal ligament
- Inferior part: spinous processes of lower thoracic vertebrae, lumbar vertebrae
- Insertion:
- Superior part: lateral 1/3 of the clavicle
- Middle part: acromion and spine of scapula
- Inferior part: trigonum of the scapula
- Functions:
- Elevate the clavicle (superior part)
- Retract the scapula (middle part)
- Depress the scapula (inferior part)
Rotator Cuff Muscles
- SIT+S: Supraspinatus, Infraspinatus, Teres minor, Subscapularis
- Function: stabilize the shoulder joint and keep the head of the humerus inside the glenoid cavity
Teres Major
- Origin: posterior surface of scapula
- Insertion: crest of lesser tubercle
- Innervation: lower subscapular nerve
- Function: adduction, medial rotation, and extension of the arm
Deltoid Muscle
- Origin:
- Anterior part: clavicle
- Middle part: acromion
- Posterior part: spine of scapula
- Insertion: deltoid tuberosity of humerus
- Innervation: axillary nerve
- Function: abduction, flexion, and extension of the arm
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Description
Test your knowledge on the innervation, origin, and function of the Trapezius and Latissimus Dorsi muscles. This quiz is clinically oriented and based on the anatomy described in 'ANATOMY.Keith L.Moore, Arthur F.Dalley'.
