Brachial Plexus Structures Flashcards
7 cards from real Anatomy Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Brachial Plexus Structures flashcards as text
The long thoracic nerve innervates which muscle and arises from which roots?
Answer: Serratus anterior; C5, C6, C7
The long thoracic nerve (of Bell) arises from C5, C6, C7 roots and innervates the serratus anterior.
The thoracodorsal nerve innervates the latissimus dorsi and arises from which cord?
Answer: Posterior cord
The thoracodorsal nerve is a branch of the posterior cord (C6–C8) and innervates the latissimus dorsi.
Which nerve arises from the posterior cord and supplies the teres major and subscapularis?
Answer: Lower subscapular nerve
The lower subscapular nerve (C5–C6) innervates both teres major and the lower portion of subscapularis.
A patient has loss of sensation over the medial arm. Which nerve is most likely injured?
Answer: Medial cutaneous nerve of the arm
The medial cutaneous nerve of the arm (medial brachial cutaneous nerve) provides sensation to the medial surface of the arm.
Which division-level structure of the brachial plexus is located posterior to the clavicle?
Answer: Divisions
The divisions of the brachial plexus lie posterior to the clavicle, between the trunks and cords.
The medial pectoral nerve and lateral pectoral nerve together innervate which muscles?
Answer: Pectoralis major and pectoralis minor
The lateral pectoral nerve innervates pectoralis major; the medial pectoral nerve innervates pectoralis minor and pectoralis major.
Which brachial plexus root contributes to both the phrenic nerve and the brachial plexus?
Answer: C5
C5 contributes to the phrenic nerve (along with C3 and C4) and is also the most superior root of the brachial plexus.