Podcast
Questions and Answers
Which muscle primarily abducts the arm beyond the initial 15°?
Which muscle primarily abducts the arm beyond the initial 15°?
The trapezius muscle is innervated by the dorsal scapular nerve.
The trapezius muscle is innervated by the dorsal scapular nerve.
False
What is the primary function of the trapezius muscle?
What is the primary function of the trapezius muscle?
Powerful elevator of the scapula and it also retracts and depresses the scapula.
The rhomboid major muscle originates from the spinous processes of _____ vertebrae.
The rhomboid major muscle originates from the spinous processes of _____ vertebrae.
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Match the muscles to their origin:
Match the muscles to their origin:
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Which of the following origins is correct for the trapezius muscle?
Which of the following origins is correct for the trapezius muscle?
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What is the function of the rhomboid major muscle?
What is the function of the rhomboid major muscle?
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Which statement about the deltoid muscle's innervation is accurate?
Which statement about the deltoid muscle's innervation is accurate?
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Where does the deltoid muscle insert?
Where does the deltoid muscle insert?
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Which of the following is a correct function of the trapezius muscle?
Which of the following is a correct function of the trapezius muscle?
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Study Notes
Trapezius
- Origin: Superior nuchal line, external occipital protuberance, medial margin of the ligamentum nuchae, spinous processes of C7 to T12 and related supraspinous ligaments
- Insertion: Superior edge of the spine of the scapula, acromion, posterior border of lateral one-third of clavicle
- Innervation: Spinal part of accessory nerve (XI), C3 and C4 anterior rami (sensory/proprioception)
- Function: Powerful scapula elevator, rotates scapula during humerus abduction (above horizontal), middle fibers retract scapula, lower fibers depress scapula
Deltoid
- Origin: Inferior edge of spine of scapula, lateral margin of acromion, anterior border of lateral one-third of clavicle
- Insertion: Deltoid tuberosity of humerus
- Innervation: Axillary nerve (C5, C6)
- Function: Major arm abductor (beyond initial 15° of supraspinatus), clavicular fibers assist in arm flexion, posterior fibers assist in arm extension
Levator Scapulae
- Origin: Transverse processes of C1 and C2 vertebrae, posterior tubercles of transverse processes of C3 and C4 vertebrae
- Innervation: Branches of C3, C4 anterior rami, and branches of the dorsal scapular nerve (C5)
- Function: Elevates scapula
Rhomboid Minor
- Origin: Lower end of ligamentum nuchae, spinous processes of C7 and T1 vertebrae
- Innervation: Dorsal scapular nerve (C4, C5)
- Function: Elevates and retracts scapula
Rhomboid Major
- Origin: Spinous processes of T2-T5 vertebrae and intervening supraspinous ligaments
- Insertion: Posterior surface of medial border of scapula (from superior angle to root of spine of scapula)
- Innervation: Dorsal scapular nerve (C4, C5)
- Function: Elevates and retracts scapula
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Description
This quiz focuses on the anatomy of the trapezius and deltoid muscles, including their origins, insertions, innervations, and functions. Test your knowledge on how these muscles contribute to shoulder and arm movement.
