Podcast
Questions and Answers
Which nerve is responsible for innervating the rhomboid major and minor muscles?
Which nerve is responsible for innervating the rhomboid major and minor muscles?
What is a potential cause of long thoracic nerve damage?
What is a potential cause of long thoracic nerve damage?
Which of the following muscles is NOT innervated by a branch of the brachial plexus?
Which of the following muscles is NOT innervated by a branch of the brachial plexus?
Which nerves arise from the roots of the brachial plexus?
Which nerves arise from the roots of the brachial plexus?
Signup and view all the answers
What is the functional classification of the long thoracic nerve?
What is the functional classification of the long thoracic nerve?
Signup and view all the answers
Which nerve is associated with 'scapular winging' when damaged?
Which nerve is associated with 'scapular winging' when damaged?
Signup and view all the answers
Which of the following nerves arises from the upper trunk of the brachial plexus?
Which of the following nerves arises from the upper trunk of the brachial plexus?
Signup and view all the answers
What is the primary function of the nerve to the subclavius?
What is the primary function of the nerve to the subclavius?
Signup and view all the answers
Which nerve is most commonly injured due to a humeral fracture at the surgical neck?
Which nerve is most commonly injured due to a humeral fracture at the surgical neck?
Signup and view all the answers
Which nerve is primarily responsible for innervating the deltoid muscle?
Which nerve is primarily responsible for innervating the deltoid muscle?
Signup and view all the answers
What is the nerve that innervates the thumb and web space?
What is the nerve that innervates the thumb and web space?
Signup and view all the answers
Which nerve is most susceptible to injury in tennis players who frequently perform overhead smashes?
Which nerve is most susceptible to injury in tennis players who frequently perform overhead smashes?
Signup and view all the answers
Which of the following is NOT a symptom of Quadrangular Space Syndrome?
Which of the following is NOT a symptom of Quadrangular Space Syndrome?
Signup and view all the answers
What is the primary reason why the term "terminal portions" is preferred over "terminal divisions" in the context of the Axillary Nerve?
What is the primary reason why the term "terminal portions" is preferred over "terminal divisions" in the context of the Axillary Nerve?
Signup and view all the answers
Which two nerve roots contribute mainly to the formation of the Axillary Nerve?
Which two nerve roots contribute mainly to the formation of the Axillary Nerve?
Signup and view all the answers
What is the common name for the cutaneous distribution of the Axillary Nerve?
What is the common name for the cutaneous distribution of the Axillary Nerve?
Signup and view all the answers
Which muscle(s) is/are innervated by the deep radial nerve, but NOT the radial nerve?
Which muscle(s) is/are innervated by the deep radial nerve, but NOT the radial nerve?
Signup and view all the answers
Which muscle in the antebrachium is innervated by a nerve originating from the brachial plexus?
Which muscle in the antebrachium is innervated by a nerve originating from the brachial plexus?
Signup and view all the answers
Which of the following nerves does NOT contribute to the innervation of the thumb muscles?
Which of the following nerves does NOT contribute to the innervation of the thumb muscles?
Signup and view all the answers
Which nerve is responsible for the sensation of the posterior aspect of the forearm?
Which nerve is responsible for the sensation of the posterior aspect of the forearm?
Signup and view all the answers
Which TWO muscles contribute to the deep head of the Flexor pollicis brevis?
Which TWO muscles contribute to the deep head of the Flexor pollicis brevis?
Signup and view all the answers
What components are included in the muscular branches of the nerves in the brachial plexus?
What components are included in the muscular branches of the nerves in the brachial plexus?
Signup and view all the answers
Which of the following correctly describes the organization of the brachial plexus?
Which of the following correctly describes the organization of the brachial plexus?
Signup and view all the answers
What is the path of re-assortment for the Ventral Primary Rami in the brachial plexus?
What is the path of re-assortment for the Ventral Primary Rami in the brachial plexus?
Signup and view all the answers
Which nerves are primarily involved in innervating the muscles of the upper extremity?
Which nerves are primarily involved in innervating the muscles of the upper extremity?
Signup and view all the answers
What term describes the classification of fibers that provide input from muscular and vascular elements?
What term describes the classification of fibers that provide input from muscular and vascular elements?
Signup and view all the answers
Which structure in the brachial plexus is labeled in relation to the axillary artery?
Which structure in the brachial plexus is labeled in relation to the axillary artery?
Signup and view all the answers
What is the spinal nerve root range from which the brachial plexus arises?
What is the spinal nerve root range from which the brachial plexus arises?
Signup and view all the answers
What does 'segmental innervation' refer to in the context of peripheral nerve distribution?
What does 'segmental innervation' refer to in the context of peripheral nerve distribution?
Signup and view all the answers
Which of the following muscles is NOT innervated by the median nerve?
Which of the following muscles is NOT innervated by the median nerve?
Signup and view all the answers
Which branch of the median nerve is responsible for supplying the palm?
Which branch of the median nerve is responsible for supplying the palm?
Signup and view all the answers
What is the primary function of the postganglionic GVE sympathetic axons distributed by the median nerve?
What is the primary function of the postganglionic GVE sympathetic axons distributed by the median nerve?
Signup and view all the answers
Which group of muscles is primarily affected by pronator teres syndrome?
Which group of muscles is primarily affected by pronator teres syndrome?
Signup and view all the answers
What characterizes the distribution of the median nerve to the hand?
What characterizes the distribution of the median nerve to the hand?
Signup and view all the answers
Which muscle is innervated by the anterior interosseous branch of the median nerve?
Which muscle is innervated by the anterior interosseous branch of the median nerve?
Signup and view all the answers
In carpal tunnel syndrome, which branch of the median nerve remains unaffected?
In carpal tunnel syndrome, which branch of the median nerve remains unaffected?
Signup and view all the answers
Which condition can cause symptoms in both the palmar cutaneous and common proper digital branches of the median nerve?
Which condition can cause symptoms in both the palmar cutaneous and common proper digital branches of the median nerve?
Signup and view all the answers
Which muscles are primarily innervated by the suprascapular nerve?
Which muscles are primarily innervated by the suprascapular nerve?
Signup and view all the answers
From which portion of the brachial plexus do the infraclavicular branches derive?
From which portion of the brachial plexus do the infraclavicular branches derive?
Signup and view all the answers
Which nerve innervates the upper and lower fibers of the pectoralis major?
Which nerve innervates the upper and lower fibers of the pectoralis major?
Signup and view all the answers
Which nerve is primarily responsible for the internal rotation of the shoulder?
Which nerve is primarily responsible for the internal rotation of the shoulder?
Signup and view all the answers
The musculocutaneous nerve is a terminal branch of which part of the brachial plexus?
The musculocutaneous nerve is a terminal branch of which part of the brachial plexus?
Signup and view all the answers
Which of the following muscles is NOT innervated by the musculocutaneous nerve?
Which of the following muscles is NOT innervated by the musculocutaneous nerve?
Signup and view all the answers
What sensory function is associated with the suprascapular nerve?
What sensory function is associated with the suprascapular nerve?
Signup and view all the answers
Which nerve is responsible for innervating the latissimus dorsi muscle?
Which nerve is responsible for innervating the latissimus dorsi muscle?
Signup and view all the answers
Study Notes
Upper Extremity Peripheral Nerve Review
- This review is a reference for the neuroanatomy of the upper extremity
- Key areas of focus include:
- Brachial plexus components (roots, trunks, divisions, cords, and branches)
- Names of terminal nerves and their branches
- Nerves innervating extremity muscles
- Spinal nerve distribution to individual muscles (segmental innervation)
- Indicator muscles and reflexes for individual spinal nerve roots (MSR levels)
- Muscle actions are not covered; refer to other anatomy resources for those
- All muscular branches of nerves include somatic components (GSE, GSA, high/low threshold), vascular components (GVA, high/low threshold), and postganglionic GVE sympathetic fibers to muscles
- All cutaneous branches include somatic components (GSA, high/low threshold) vascular components (GVA, high/low threshold), and postganglionic sympathetic fibers to vascular elements
The Brachial Plexus
- Arises from the Ventral Primary Rami (VPR) of spinal nerve roots C5-T1
- VPR reorganize into:
- Roots (C5-T1)
- Trunks (upper-C5, C6; middle-C7; lower-C8,T1)
- Divisions (anterior and posterior from each trunk)
- Cords (lateral, medial, posterior)
- Terminal branches/nerves (musculocutaneous, axillary, radial, median, ulnar)
- Several nerves branch off the roots, trunks, and cords prior to terminal nerves
- The terminal nerves then have additional branches
Additional Details
- Nerves arising from roots include dorsal scapular, long thoracic nerves. These innervate rhomboid muscles, serratus anterior (long thoracic nerve). Significant weakness can be indicated by scapular winging.
- Nerves arising from trunks include (nerve to subclavius, suprascapular - innervates supraspinatus and infraspinatus).
- Infraclavicular branches derive from cords and include (lateral pectoral, medial pectoral, upper/lower subscapular, thoracodorsal which innervates latissimus dorsi).
- Details on various nerves also include cutaneous and muscular innervation, important clinical implications.
- Multiple illustrations of brachial plexus, nerves and their branches
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This review provides a comprehensive reference for the neuroanatomy of the upper extremity, focusing on the brachial plexus, terminal nerves, and muscle innervation. It also covers spinal nerve distribution and reflex indicators without delving into muscle actions. For deeper anatomical insights beyond the scope of this review, supplementary resources are recommended.
