Brachial Plexus and Shoulder Girdle Muscles
46 Questions
28 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which nerve arises from the roots and trunks of the brachial plexus?

  • Dorsal scapular nerve (correct)
  • Nerve to subclavius
  • Long thoracic nerve
  • Suprascapular nerve

    • Which nerve is formed by the joining of the medial and lateral cords of the brachial plexus?

  • Musculocutaneous nerve
  • Ulnar nerve
  • Lateral pectoral nerve
  • Median nerve (correct)

    • Which nerve is not a branch of the lateral cord of the brachial plexus?

  • Lateral pectoral nerve
  • Musculocutaneous nerve
  • Median nerve (correct)

    • Which nerve is not a branch of the medial cord of the brachial plexus?

    <p>Radial nerve</p> Signup and view all the answers

    Which nerve is a branch of the posterior cord of the brachial plexus?

    <p>Axillary nerve</p> Signup and view all the answers

    Which cord of the brachial plexus is formed from the anterior divisions of the superior and middle trunks?

    <p>Lateral cord</p> Signup and view all the answers

    Which cord of the brachial plexus is formed from the posterior divisions of all three trunks?

    <p>Posterior cord</p> Signup and view all the answers

    Which cord of the brachial plexus is formed from the anterior division of the inferior trunk?

    <p>Medial cord</p> Signup and view all the answers

    How many terminal branches does the brachial plexus have?

    <p>5</p> Signup and view all the answers

    Which part of brachial plexus passes through the scalene muscles?

    <p>Roots</p> Signup and view all the answers

    Which part of the trapezius muscle covers the upper and back part of the neck and shoulders?

    <p>All parts of the trapezius</p> Signup and view all the answers

    Which nerve innervates the upper fibers of the trapezius muscle?

    <p>Spinal accessory nerve (CN XI)</p> Signup and view all the answers

    Which nerve innervates the rhomboids minor muscle?

    <p>Dorsal scapular nerve</p> Signup and view all the answers

    Which nerve innervates the levator scapulae muscle?

    <p>Dorsal scapular nerve</p> Signup and view all the answers

    Which nerve innervates the pectoralis minor muscle?

    <p>Medial pectoral nerve</p> Signup and view all the answers

    Which nerve innervates the serratus anterior muscle?

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

    Which nerve innervates the pectoralis major muscle?

    <p>Medial and lateral pectoral nerves</p> Signup and view all the answers

    Which nerve innervates the latissimus dorsi muscle?

    <p>Thoracodorsal nerve</p> Signup and view all the answers

    Which of the following correctly describes the brachial plexus?

    <p>It is formed by the union of the anterior rami of C5 – T1.</p> Signup and view all the answers

    Which muscles are supplied by the anterior divisions of the trunks of the brachial plexus?

    <p>Flexor compartments of the upper limb.</p> Signup and view all the answers

    Where do the roots of the brachial plexus usually pass through?

    <p>The gap between the anterior and the middle scalene muscles.</p> Signup and view all the answers

    How many trunks does the brachial plexus have?

    <p>3</p> Signup and view all the answers

    What does the lateral cord of the brachial plexus consist of?

    <p>Anterior divisions of the superior and middle trunks.</p> Signup and view all the answers

    What does the medial cord of the brachial plexus consist of?

    <p>Anterior division of the inferior trunk.</p> Signup and view all the answers

    What does the posterior cord of the brachial plexus consist of?

    <p>Posterior divisions of all three trunks.</p> Signup and view all the answers

    Where do almost all branches of the brachial plexus arise?

    <p>In the axilla.</p> Signup and view all the answers

    Which of the following is NOT true about the brachial plexus?

    <p>It begins in the neck.</p> Signup and view all the answers

    Which of the following is NOT a trunk of the brachial plexus?

    <p>Posterior trunk</p> Signup and view all the answers

    The supraclavicular part of the brachial plexus gives rise to the long thoracic nerve

    <p>True</p> Signup and view all the answers

    The infraclavicular part of the brachial plexus gives rise to the subscapular nerve

    <p>False</p> Signup and view all the answers

    The dorsal scapular nerves arises from the ____clavicular part of the plexus (infra or supra)

    Signup and view all the answers

    Which of the following is a branch of the lateral cord?

    <p>Lateral pectoral nerve</p> Signup and view all the answers

    The primary action(s) of the upper fibers of the trapezius are

    <p>Elevation and upward rotation of scap</p> Signup and view all the answers

    Which nerve innervates the levator scapulae muscle?

    <p>Dorsal scapular nerve</p> Signup and view all the answers

    What is the primary function of the rhomboids minor muscle?

    <p>Retraction (adduction) of spine</p> Signup and view all the answers

    Which nerve innervates the serratus anterior muscle?

    <p>Long thoracic nerve</p> Signup and view all the answers

    What is the primary function of the trapezius muscle?

    <p>Elevation of scapula</p> Signup and view all the answers

    Which nerve innervates the rhomboids major muscle?

    <p>Dorsal scapular nerve</p> Signup and view all the answers

    What is the primary function of the pectoralis major muscle?

    <p>Flexion of arm</p> Signup and view all the answers

    Which nerve innervates the subclavius muscle?

    <p>Nerve to subclavius</p> Signup and view all the answers

    What is the primary function of the serratus anterior muscle?

    <p>Protraction (abduction) of scapula</p> Signup and view all the answers

    Which nerve innervates the trapezius muscle?

    <p>Spinal accessory nerve</p> Signup and view all the answers

    What is the main action of the middle fibers of the trapezius?

    <p>Retraction of Scap</p> Signup and view all the answers

    Pec Minor has similar actions to Pec major

    <p>False</p> Signup and view all the answers

    List 3 actions that Pec Minor can perform at the scapula

    Signup and view all the answers

    Which action is associated with latissimus dorsi?

    <p>Anterior pelvic tilt</p> Signup and view all the answers

    Study Notes

    Brachial Plexus Overview

    • The brachial plexus is formed by anterior rami of spinal nerves C5-T1.
    • It consists of roots, trunks, divisions, cords, and terminal branches.

    Nerves from Brachial Plexus

    • The long thoracic nerve arises from the roots and trunks of the brachial plexus.
    • The median nerve is formed by the joining of the medial and lateral cords.
    • The thoracodorsal nerve is a branch of the posterior cord.
    • The radial nerve is not a branch of the lateral cord.
    • The ulnar nerve is not a branch of the medial cord.

    Cords of the Brachial Plexus

    • The lateral cord is formed from the anterior divisions of the superior and middle trunks.
    • The posterior cord is formed from the posterior divisions of all three trunks.
    • The medial cord is formed from the anterior division of the inferior trunk.

    Terminal Branches

    • The brachial plexus typically has five terminal branches: median, ulnar, musculocutaneous, axillary, and radial.

    Anatomical Relations

    • The roots of the brachial plexus pass through the scalene muscles.
    • The upper and back part of the neck and shoulders is covered by the upper part of the trapezius muscle.

    Muscle Innervations

    • The upper fibers of the trapezius are innervated by the accessory nerve (CN XI).
    • The rhomboids minor and major are innervated by the dorsal scapular nerve.
    • The levator scapulae muscle is also innervated by the dorsal scapular nerve.
    • The pectoralis minor is innervated by the medial pectoral nerve.
    • The serratus anterior muscle is innervated by the long thoracic nerve.
    • The pectoralis major muscle is innervated by the lateral and medial pectoral nerves.
    • The latissimus dorsi muscle is innervated by the thoracodorsal nerve.
    • The subclavius muscle is innervated by the nerve to subclavius.

    Muscle Functions

    • The primary actions of the upper fibers of the trapezius include elevation and upward rotation of the scapula.
    • The rhomboids minor muscle primarily retracts the scapula.
    • The primary function of the trapezius muscle includes scapular elevation, retraction, and rotation.
    • The primary actions of the pectoralis major include adduction and medial rotation of the humerus.
    • The serratus anterior muscle is crucial for scapular protraction and stabilization.
    • The middle fibers of the trapezius are primarily involved in retracting the scapula.

    Pec Minor Actions

    • Pectoralis minor has similar actions to pectoralis major, including stabilization of the scapula.
    • Actions that pectoralis minor can perform at the scapula include depression, protraction, and downward rotation.

    General Notes

    • Almost all branches of the brachial plexus arise from the cords.
    • The supraclavicular part gives rise to nerves like the long thoracic nerve.
    • The infraclavicular part gives rise to nerves such as the subscapular nerve.
    • The dorsal scapular nerve arises from the supraclavicular part of the plexus.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    BMS MSK Lecture 6 Fall 2023 student.pptx

    Description

    Test your knowledge of the brachial plexus and shoulder girdle muscles in this anatomy quiz. Covering topics from Moore's Clinically Oriented Anatomy, this quiz will assess your understanding of upper limb anatomy. Prepare for your in-person class with Dr. K. Lumsden and Dr. M. Doroudi at Boucher Campus or Toronto Campus.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser