Upper Extremity: Brachial Plexus Innervation

Question 1

the brachial plexus is from a series of ___ rami from C__-T__.

Answer 1

the brachial plexus is from a series of anterior rami from C5-T1.

Question 2

BP becomes__(#)_ main __ nerves. Creates a network of nerve branches.

Answer 2

BP becomes 4 main motor nerves. Creates a network of nerve branches.

Question 3

The nerve tracts of the BP seperate into anterior and posterior division. Anterior nerve tracts serve ___ and posterior divisions serve ___.

Answer 3

The nerve tracts seperate into anterior and posterior division. Anterior nerve tracts serve flexors and posterior divisions serve extensors.

Question 4

Answer 4

Question 6

– Roots of the brachial plexus emerge from the vertebral column between the anterior and middle ___ muscles (___ groove) in the neck.

– Formation of the plexus begins in the neck (___ part), where it accompanies the ___ artery, and continues into the __ (___ part), where it accompanies the ___ artery.

– The roots, trunks, and divisions of the plexus are ____ (above the clavicle); the cords form at the level of the clavicle, and their branches are ___.

Answer 6

– Roots of the brachial plexus emerge from the vertebral column between the anterior and middle scalene muscles (interscalene groove) in the neck.

– Formation of the plexus begins in the neck (supraclavicular part), where it accompanies the subclavian artery, and continues into the axilla (infraclavicular part), where it accompanies the axillary artery.

– The roots, trunks, and divisions of the plexus are supraclavicular (above the clavicle); the cords form at the level of the clavicle, and their branches are infraclavicular

Question 7

Roots C5 to T1 combine to form three trunks:

1. C5 and C6 form the __ trunk.
2. C7 forms the __ trunk.
3. C8 and T1 form the __ trunk.

Answer 7

Roots C5 to T1 combine to form three trunks:

1. C5 and C6 form the upper trunk.
2. C7 forms the middle trunk.
3. C8 and T1 form the lower trunk.

Question 8

1. Anterior divisions of the upper and middle trunk (C5–C7) form the __ cord.
2. Anterior divisions of the lower trunk (C8–T1) form the m__edial cord.
3. Posterior divisions of all trunks (C5–T1) form the __ cord.

the three cords divide to form the five terminal nerves of the plexus.

Answer 8

1. Anterior divisions of the upper and middle trunk (C5–C7) form the lateral cord.
2. Anterior divisions of the lower trunk (C8–T1) form the medial cord.
3. Posterior divisions of all trunks (C5–T1) form the posterior cord.

therefore, the roots–> trunk –> cords

Question 9

The three cords divide to form the five terminal nerves of the plexus.

○ Medial and lateral cords form the __, __, and __ nerves, which innervate the __ muscles of the arm and forearm, and all muscles of the __.

○ The posterior cord forms the __ and __ nerves, which innervate muscles of the __ and __ regions and __ muscles of the arm and forearm.

Answer 9

The three cords divide to form the five terminal nerves of the plexus.

○ Medial and lateral cords form the musculocutaneous, median, and ulnar nerves, which innervate the anterior muscles of the arm and forearm, and all muscles of the palm.

○ The posterior cord forms the axillary and radial nerves, which innervate muscles of the scapular and deltoid regions and posterior muscles of the arm and forearm.

Question 10

1. Anterior divisions of the upper and middle trunk (C5–C7) form the lateral cord.
2. Anterior divisions of the lower trunk (C8–T1) form the medial cord.
3. Posterior divisions of all trunks (C5–T1) form the posterior cord.

Question 11

Remember this diagram

Question 12

Which nerve serves which region of the hand

Answer 12

Question 13

which nerve serves which reigon of the posterior view of hand?

Answer 13

Question 14

Answer 14

Question 15

labell the snuff box

Answer 15