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29 Cards in this Set

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  • Back
What are the roots of the brachial plexus?
C5-C8, T1
What innervates the rhomboids and where does this nerve come from? What spinal nerve?
The dorsal scapular nerve off the C5 root of the brachial plexus.
What innervates the levator scapulae muscle?
The dorsal scapular nerve off of the C5 root of the brachial plexus. Also C3 and C4 cervical nerves.
What does the dorsal scapular nerve (from C5 root of brachial plexus) innervate?
The rhomboids and part of levator scapulae.
What innervates the serratus anterior?
Long thoracic nerve (C5-C7 roots of brachial plexus).
After the roots/rami, what does the brachial plexus divide into?
3 trunks-- superior, middle and inferior.
What nerves does the superior/upper trunk (C5, C6) of the brachial plexus give off?
Suprascapular nerve to infra/supraspinatus muscles and the nerve to the subclavius muscle.
What innervates the infra/supraspinatus muscles?
Suprascapular nerve from superior trunk of brachial plexus.
What innervates the subclavius muscle?
The nerve to the subclavius from the superior trunk of the brachial plexus.
After trunks, what does the brachial plexus become?
Divisions.
After divisions, what does the brachial plexus become?
Cords-- lateral, posterior, and medial.
What does the lateral cord (C5-C7) give rise to?
lateral pectoral nerve to pec major and minor.
What does the posterior cord (C5, C6) give rise to?
upper and lower subscapular upper and lower subscapular nerves to subscapularis and teres major. also thoracodorsal nerve to latissimus dorsi.
What does the medial cord (C8, T1) give rise to?
medial pectoral nerve to pec major and minor.
What innervates pectoralis major?
medial (from medial cord) and lateral (from lateral cord) pectoral nerves
What innervates pectoralis minor?
medial pectoral nerve from medial cord.
What innervates subscapularis muscle?
Upper and lower subscapular nerves from posterior cord (C5, C6) of brachial plexus.
What innervates teres major?
Lower subscapular from posteror cord (C5, C6) of brachial plexus.
What innervates latissimus dorsi?
Thoracodorsal nerve from posterior cord (C5, C6) of brachial plexus.
What innervates the trapezius?
CN XI - spinal accessory.
What makes the superior trunk?
C5 and C6
What makes the middle trunk?
C7
What makes the inferior trunk?
C8 and T1
What makes the lateral cord?
C5-C7
What makes the posterior cord?
C5-T1 all contribute fibers
What makes the medial cord?
C8, T1
What happens after the lateral cord?
Musculocutaneous nerve and then contributions to median nerve.
What happens to the posterior cord?
Axillary nerve and radial nerve.
What happens to the medial cord?
Contributions to the median nerve, ulnar nerve, and cutaneous nerves to arm and forearm.