Brachial Plexus

Question 1

What Ventral roots are involved in the brachial plexus?

Answer 1

C5-T1

Question 2

Name the progressive structures formed by the nerves as they exit the spinal chord, form and then leave the brachial plexus

Answer 2

Roots, Trunks, Divisions, Chords, Branches

Robert Tailor Drinks Cold Beers.

Question 3

What forms the posterior chord, what forms the lateral chord, what forms the medial chord

Answer 3

POSTERIOR- posterior divisions of superior, middle, and inferior trunks. LATERAL - anterior division of superior and middle trunks. MEDIAL- anterior division of the inferior trunk.

Question 4

The position of the chords are named with respect to what structure?

Answer 4

Axillary artery

Question 5

What two upper extremity muscles do not receive all of their motor innervation from the brachial plexus?

Answer 5

Levator Scapular (C3, C4) and Trapezius (CN XI)

Question 6

Radiculopathy is a lesion at what level?

Answer 6

Level of the spinal nerve

Question 7

Plexopathy is a lesion at what level?

Answer 7

Level of a trunk or chord

Question 8

Peripheral mononeuropathies is a lesion at what level?

Answer 8

lesion at level of a branch of the bp

Question 9

What is the group of muscles called that are innervated by the same spinal root?

Answer 9

myotome

Question 10

What are the three signs of radiculopathy?

Answer 10

Sensory loss, motor loss, reflex signs

Question 11

What is the notch under the spine of the scapula?

Answer 11

Spinoglenoid notch.

Question 12

Lesion to Dorsal scapular nerve

Answer 12

Weakness to levator scapulae, rhomboid major and minor, lateral deviation and upward rotation of scapula

Question 13

Lesion long thoracic nerve

Answer 13

Weakness of serratus anterior, when asked to push against wall you patient displays winged scapula

Question 14

Suprascapular Nerve lesion

Answer 14

Weakness to supraspinatus and infraspinatus. Weak Abduction and lateral rotation.

Question 15

Upper and lower subscapular nerve lesion

Answer 15

Weakness of subscapularis and teres major, weak medial rotation and adduction. Difficulty scratching back with back

Question 16

Thoracodorsal nerve lesion

Answer 16

Loss of motor to latissimus dorsi, weak adduction extension and medial rotation. cant place dorsum of hand on back

Question 17

Axillary nerve lesion

Answer 17

Deltoid and teres minor, skin of upper and lateral aspect of the arm superficial to deltoid. Weak abduction and flattening of shoulder

Question 18

What is a common nerve injured in a seatbelt injury?

Answer 18

Pectoral nerve

Question 19

An ulnar nerve at the axilla causes what?

Answer 19

sensory loss to ulnar innervated areas, and ulnar claw, 4th and 5th MP joints are hyperextended and IP joints are flexed

Question 20

What hand symptoms does a lesion of the median nerve lead to?

Answer 20

Ape hand

Question 21

What deformity is observed in upper trunk palsy?

Answer 21

Waiters tip deformity.

Question 22

What are the main symptoms of a middle trunk paralysis

Answer 22

Radial nerve and extension

Question 23

What are the symptoms of a lower trunk palsy?

Answer 23

loss of sensation on medial part of arm and loss of flexors in the hands. Lower trunk palsy can also show some horners syndrome effects on the autonomics heading to the neck

Question 24

What are symptoms of a lateral chord lesion?

Answer 24

loss of sensory to lateral portion of arm, weak flexion of forearm and wrist, digits and pronation.
both musculocutaneous and median affected.

Question 25

lesion of the medial chord?

Answer 25

Ulnar nerve knocked out. loss of sensory to medial part of arm and hand. Weak flexion of the wrist and digits and weak movement of the thumb and pinky.

Question 26

Posterior chord lesion?

Answer 26

Loss of sensory to posterior of arm, weak extension of everything. and weak movement of the shoulder, Both the radial and axillary never are knocked out.