Peripheral Nerves in Physical Therapy
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Peripheral Nerves in Physical Therapy

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.

Created by
@ExaltingPolarBear

Questions and Answers

Which nerve originates from the lateral cord of the brachial plexus?

Musculocutaneous nerve (C5, 6, 7)

Which nerve innervates the deltoid and teres minor muscles?

Axillary nerve (C5, 6)

Which nerve is formed by the combination of the medial and lateral roots?

Median nerve (C5,6,7,8; T1)

Which nerve courses through the quadrangular space in contact with the surgical neck of the humerus?

<p>Axillary nerve (C5, 6)</p> Signup and view all the answers

Which nerve supplies the muscles in the anterior compartment of the arm?

<p>Musculocutaneous nerve (C5, 6, 7)</p> Signup and view all the answers

Which structure is found superficial to the extensor retinaculum of the hand?

<p>Dorsal cutaneous branch of the ulnar nerve</p> Signup and view all the answers

What is the clinical significance of pain and swelling in the anatomical snuff box?

<p>It indicates a fracture of the scaphoid bone</p> Signup and view all the answers

Which tendons are located in the 4th compartment deep to the extensor retinaculum of the hand?

<p>Extensor digitorum and extensor indicis tendons</p> Signup and view all the answers

What is the function of the extensor retinaculum in relation to the hand?

<p>It holds the extensor tendons in position</p> Signup and view all the answers

What structures are located deep to the extensor retinaculum in the 1st compartment of the hand?

<p>Abductor pollicis longus and extensor pollicis brevis tendons</p> Signup and view all the answers

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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