Anatomy of the Axilla and Brachial Plexus
9 Questions
3 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

What is the apex of the axilla primarily bounded by?

  • Pectoralis major, clavicle, upper ribs
  • Upper part of humerus, teres major, subscapularis
  • Coracobrachialis, pectoralis minor, axillary fat
  • 1st rib, clavicle, scapula (correct)

Which nerves are included in the branches of the brachial plexus?

  • Lateral pectoral nerve, suprascapular nerve, thoracodorsal nerve
  • Musculocutaneous nerve, radial nerve, brachial nerve
  • Femoral nerve, tibial nerve, vagus nerve
  • Ulnar nerve, median nerve, axillary nerve (correct)

Which muscle is NOT supplied by the branches of the brachial plexus?

  • Trapezius (correct)
  • Subscapularis
  • Latissimus dorsi
  • Biceps brachii

What is the main role of the axillary nerve?

<p>Supply the deltoid and teres minor muscles (B)</p> Signup and view all the answers

From where does the axillary nerve originate?

<p>Posterior cord of the brachial plexus (D)</p> Signup and view all the answers

What contents are found within the axilla?

<p>Axillary artery, axillary vein, brachial plexus (A)</p> Signup and view all the answers

What defines the base of the axilla?

<p>Skin and axillary fascia (B)</p> Signup and view all the answers

Which of the following statements about the brachial plexus is correct?

<p>It has roots that consist of anterior rami of C5 to T1. (C)</p> Signup and view all the answers

Which nerve is responsible for innervating the rhomboids?

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

Flashcards

Axilla Definition

The pyramidal space between the arm and chest.

Axilla Apex Components

The top of the axilla, connecting the neck and upper limb. Bounded by first rib, clavicle, scapula, and parts of muscles.

Axillary Contents

Artery, vein, brachial plexus, lymph nodes, fat, and connective tissue.

Brachial Plexus Location

Nerve network from the neck into the axilla, in posterior triangle of neck and within axilla.

Signup and view all the flashcards

Brachial Plexus Formation (Roots)

Formed from the anterior rami of spinal nerves C5-T1.

Signup and view all the flashcards

Brachial Plexus Trunks

Upper (C5, C6), Middle (C7), Lower (C8, T1) bundles formed from the roots.

Signup and view all the flashcards

Brachial Plexus Cords

Lateral (C5-C7), Medial (C8-T1), Posterior (C5-T1) bundles formed from divisions of trunks.

Signup and view all the flashcards

Axillary Nerve Origin

A branch of the posterior cord of the brachial plexus.

Signup and view all the flashcards

Axillary Nerves roots

C5 and C6

Signup and view all the flashcards

Quadrangular Space

Region through which the axillary nerve passes.

Signup and view all the flashcards

Study Notes

Axilla

  • Definition: Pyramidal space between upper parts of arm and chest
  • Boundaries:
    • Apex (cervicoaxillary canal):
      • Connects neck and apex of axilla
      • Transmits vessels and nerves to upper limb
      • Bounded by medial 1st rib, anterior clavicle, and posterior scapula
    • Anterior wall: Pectoralis major, Clavipectoral fascia, Subclavius, Pectoralis minor
    • Posterior wall: Subscapularis, Latissimus dorsi, Teres major
    • Medial wall: Upper 5 ribs, intercostal muscles, Upper part of serratus anterior
    • Lateral wall: Upper part of humerus shaft, Coracobrachialis, Bicipital groove of humerus, Biceps
  • Contents:
    • Axillary artery
    • Axillary vein
    • Brachial plexus (infraclavicular part)
    • Axillary lymph nodes
    • Axillary fat
    • Loose connective tissue
  • Base:
    • Skin
    • Axillary fascia

Brachial Plexus

  • Definition: Network of nerves extending from the neck into the axilla
  • Formation: Anterior rami of C5, 6, 7, 8, and T1
  • Trunks: Upper (C5, 6), Middle (C7), Lower (C8, T1)
  • Divisions: Each trunk divides into anterior and posterior divisions
  • Cords: Lateral (upper and middle trunks), Medial (lower trunk), Posterior (all three trunks)
  • Branches: Numerous, supplying muscles and sensory innervation of the upper limb (excluding trapezius). Specific examples are provided in the text. The ulnar nerve receives fibers from the median nerve (C7).
  • Root value: C5, 6.

Axillary Nerve

  • Origin: Posterior cord of brachial plexus
  • Course and relations: Posterior to axillary artery, through quadrangular space, posterior to surgical neck of humerus
  • Branches and distribution:
    • Anterior branch: Anterior part of deltoid
    • Posterior branch: Posterior part of deltoid and teres minor
    • Upper lateral cutaneous nerve of arm: Supplies skin over deltoid
  • Injury causes: Fracture of surgical neck of humerus, or dislocation of shoulder
  • Motor consequences: Deltoid paralysis, Loss of abduction 15-90°
  • Sensory consequences: Loss of sensation over the deltoid

Studying That Suits You

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

Quiz Team

Related Documents

Axilla and Brachial Plexus PDF

Description

This quiz tests your knowledge on the anatomy of the axilla and the brachial plexus. Learn about the boundaries, contents, and functions of this crucial area in the upper body. Explore the structures that connect the neck to the axilla and their significance.

More Like This

Anatomy of the Axilla
10 questions

Anatomy of the Axilla

HardierHorseChestnut4640 avatar
HardierHorseChestnut4640
Axilla & Brachial Plexus Anatomy Quiz
24 questions
Axilla and Brachial Plexus Anatomy
133 questions
Axilla and Brachial Plexus Anatomy
24 questions
Use Quizgecko on...
Browser
Browser