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Questions and Answers
Which nerve originates from the lateral cord of the brachial plexus?
Which nerve innervates the deltoid and teres minor muscles?
Which nerve is formed by the combination of the medial and lateral roots?
Which nerve courses through the quadrangular space in contact with the surgical neck of the humerus?
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Which nerve supplies the muscles in the anterior compartment of the arm?
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Which structure is found superficial to the extensor retinaculum of the hand?
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What is the clinical significance of pain and swelling in the anatomical snuff box?
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Which tendons are located in the 4th compartment deep to the extensor retinaculum of the hand?
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What is the function of the extensor retinaculum in relation to the hand?
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What structures are located deep to the extensor retinaculum in the 1st compartment of the hand?
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Study Notes
Brachial Plexus Formation
- The brachial plexus is formed by the ventral rami of C5, 6, 7, 8, and T1 nerves.
Stages of Brachial Plexus Formation
- Roots: formed mainly by the ventral rami of C5, 6, 7, 8, and T1 nerves.
- Trunks:
- Upper trunk is formed by C5 and C6.
- Middle trunk is formed by C7.
- Lower trunk is formed by C8 and T1.
Division Stage
- Each trunk is divided into anterior and posterior divisions.
Cord Formation
- Lateral cord: formed by the anterior divisions of the upper and middle trunks (C5, 6, 7).
- Medial cord: formed by the anterior division of the lower trunk (C8, T1).
- Posterior cord: formed by the posterior divisions of the upper, middle, and lower trunks (C5, 6, 7, 8, T1).
Location of Roots and Trunks
- Roots and trunks are located supraclavicularly.
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Description
This quiz covers the formation and stages of the brachial plexus, which is crucial knowledge for physical therapists and students of anatomy. Test your understanding of the ventral rami, roots, and trunks involved in the brachial plexus.
