Plexus

Question 1

Cervical plexus

Answer 1

C1-C4
loops: ascending + descending branches
anteromedial to levator scapulae + middle scalene mucle
cutaneous + motor branches

Question 2

Cutaneous branches of cervical plexus

Answer 2

Lesser occipital: C2-C3
Great auricular: C2-C3
Transverse cervical: C2-C3
Supraclavicular: C3-C4

Question 3

Motor branches of cervical plexus

Answer 3

Ansa cervicalis: superior root C1, inferior root C2-C3
Phrenic: C3-C5
Segmental: C1-C4

Question 4

Brachial plexus

Answer 4

C5-T1
to upper limb
between anterior and middle scalene muscles
- superior, middle, inferior trunk ⇒ anterior, posterior divisions ⇒ lateral, medial, posterior cord

Question 5

Lumbar plexus

Answer 5

L1-L5
Iliohypogastric: T12-L1
Ilioinguinal: anterior L1
Genitofemoral: anterior L1-L2
Lateral femoral cutaneous: anterior L2-L3
Femoral: anterior L2-L4
Obturator: anterior L2-L4

Question 6

Sacral plexus

Answer 6

L5-S4
Superior gluteal: posterior L4-S1
Inferior gluteal: posterior L5-S2
Piriformis nerve: posterior S1-S2
Sciatic: posterior L4-S2, anterior L5-S3
Nerve to quadratus femoris and inferior gemellus: anterior L4-S1
Nerve to obturator internus and superior gemellus: anterior L5-S2
Posterior femoral cutaneous: posterior S1-S2, anterior S2-S3
Pudendal: anterior S2-S4

Question 7

Lesser occipital nerve

Answer 7

cervical plexus
C2-C3
skin of posterior ear + mastoid

Question 8

Great auricular nerve

Answer 8

cervical plexus
C2-C3
skin inferior to ear + parotid

Question 9

Transverse cervical nerve

Answer 9

cervical plexus
C2-C3
skin of anterior + lateral parts of neck

Question 10

Supraclavicular nerve

Answer 10

cervical plexus
C3-C4
skin around clavicle

Question 11

Ansa cervicalis

Answer 11

cervical plexus
C1-C3
infrahyoid muscles

Question 12

Phrenic nerve

Answer 12

cervical plexus
C3-C5
diaphragm + pericardium

Question 13

Supracalvicular branches of brachial plexus

Answer 13

• Dorsal scapular: C5
• Long thoracic: C5-C7
• Suprascapular: C5-C6
• Subclavian nerve: C5-C6

Question 14

Infraclavicular branches of Brachial plexus

Answer 14

• Lateral Pectoral: C5-C7
• Musculocutaneous: C5-C7
• Median: C6-C7, C8-T1
• Medial Pectoral: C8-T1
• Medial brachial cutaneous: C8-T1
• Medial antebrachial cutaneous: C8-T1
• Ulnar nerve: C8-T1
• Superior subscapular: C5
• Inferior subscapular: C6
• Thoracodorsal: C6-C8
• Axillary: C5-C6
• Radial: C5-T1