Brachial Plexus-Nerves and Muscle Innervations
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The long thoracic nerve of the brachial plexus is made up of the C5, 6 and 7 roots. What muscle does it innervate?
The serratus anterior
The dorsal scapular nerve comes off the C5 root. It innervates the rhomboids and another muscle.What does it innervate? Hint: The muscle attaches from the upper cervical process to the superior medial border or the superior angle of the scapula.
The dorsal scapular nerve innervates the levator scapulae
The infraspinatus and the supraspinatus muscle of the scapula are paired in their innervation of a nerve that comes off the upper trunk of the brachial plexus. It is made up of the C5 and C6 root. What is the nerve?
The Suprascapular nerve
The musculocutaneous nerve of the lateral cord innervates major muscles in the anterior arm. There are three muscles. What are they? Hint: one of these muscles is also innervated by the radial nerve.
Biceps Brachii, Biceps Brachialis, and the Coracobrachialis.
The median nerve and the ulnar nerve share similar innervations. If forearm muscles are the shared site, what compartment do they innervate?
Anterior Forearm. Both the ulnar and the median nerve innervate the anterior forearm.
The radial nerve innervates the three muscles. If one of the structures is the posterior forearm, what are the other two muscles?
The radial nerve innervates the brachialis and the triceps. Note: the brachialis is also innervated by the musculocutaneous nerve.
The axillary nerve comes off posteriorly of the posterior cord. It innervates two muscles. What are they? Hint: one of them comes off the lateral border to connect with the greater tubercle of the humerus while the other attaches to the deltoid tuberosity.
The axillary nerve innervates the teres minor and the deltoid
The Subscapularis is innervated by two of the three triplets of the subscapular nerves that come off the posterior cord of the brachial plexus. What are the two nerves?
The subscapularis is innervated by the lower and upper scapular nerves. Note: the nerves are ordered from left to right heading back towards the divisions.
The lower subscapular nerve innervates two structures. One of them is the subscapularis. What is the other structure. Hint: It extends from the inferior angle of the scapula to the medial lip of the humerus.
The lower susbcapular nerve innervates the teres major which extends from the inferior angle of the scapula and attaches at the medial lip of the humerus.
The medial and lateral pectoral nerves come off their respective medial and lateral cords. What two similar structures do they innervate?
The pectoralis minor and major are both innervated by the medial and lateral pectoral nerves that come from the medial and lateral cords.
If the teres major is innervated by the lower subscapular nerve of the posterior cord of the brachial plexus. What is the teres minor innervated by?
The teres minor is innervated by the axillary nerve of the posterior cord.
The trapezius is a muscle that is not innervated by a nerve coming from the brachial plexus in addition to the diaphragm. What different nerves are each these two muscles innervated by?
The trapezius is innervated by the accessory nerve while the diaphragm is innervated by the phrenic nerve.
The intercostal muscles, both interior and exterior, serve to either elevate (exterior intercostals) or depress (interior intercostals) the ribs. What nerve innervates these two muscles?
The intercostal nerve, which is not a nerve of the brachial plexus, serves to innervate the internal and external intercostal muscles.
The dorsal rami of spinal nerves innervate what muscle located in the back? Hint: It is made up of the iliocostalis, longissiumus, and spinalis which are arranged lateral to medial.
The dorsal rami of spinal nerves serve to innervate the erector spinae which is made up of three muscles.
All the nerves that we have gone over in class have sensory and motor functions. Knowing this what is their specific classification? Hint: S PG S M
sensory, postganglionic sympathetic motor
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