Spinal Nerves
Brachial Plexus Structure
Brachial Plexus Innervations
Sensory Innervations and Dermatomes
Muscles
100
This is where the mixed (sensory and motor) portion begins.
What is the spinal nerve?
100
There are ________ divisions.
What are three anterior and three posterior (6)?
100
This nerve innervates the serratus anterior.
What is the long thoracic nerve?
100
This nerve is responsible for the sensory distribution on the back of the arm.
What is the axillary nerve?
100
How many scalene muscles are there?
What is 3?
200
This portion of a spinal nerve supplies the brachial plexus.
What are the ventral rami?
200
This is the order of the brachial plexus.
What are roots, trunks, divisions, cords, and branches?
200
This nerve innervates 11 muscles in the arm.
What is the median nerve?
200
This dermatome is responsible for the radial side of the thumb and index finger.
What is the C6 dermatome?
200
The plexus exits between these two scalene muscles.
What is anterior and middle?
300
These directly exist the spinal cord.
What is the ventral rootlets?
300
Name the five terminal branches.
What are musculocutaneous, axillary, radial, median, and ulna?
300
These two nerves innervate the subscapularis.
What is the upper and lower scapular nerve?
300
This dermatome is responsible for the ulnar border of the arm and the little finger.
What is the C8 dermatome?
300
This muscle flexes the head.
What is the anterior scalene muscle?
400
This is where the mixed (sensory and motor) portion begins.
What is spinal nerve?
400
These two nerves branch off the superior trunk.
What are the suprascapular and subclavius nerves?
400
This nerve innervates both the supraspinatus and infraspinatus.
What is the suprascapular nerve?
400
These three nerves are responsible for motor flexors of the arm/hand.
What are the musculocutaneous, median, and ulnar nerves?
400
The superior attachment: posterior tubercle of transverse process of C4-C6 is this muscle(s).
What is middle and posterior?
500
Put these in order from spinal cord to plexus: a) ventral and dorsal rami b) ventral and dorsal rootlets c) spinal nerve d) dorsal and ventral roots
What is a) rootlets b) roots c) spinal nerve d) rami
500
The cords supply four areas. Name them.
What are pectorals, supscapular, brachial, and antebrachial areas.
500
This nerve innervates the brachialis, coracobrachialis, and the biceps brachii.
What is the musculocutaneous nerve?
500
These two nerves are responsible for the motor extensors of the hand/arm.
What are the radial and axillary nerves?
500
This is the inferior attachment for the middle scalene muscle.
What is the superior surface of the first rib and the posterior groove for subclavian artery.
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