Nerve Plexuses GBA

Question 1

Brachial Plexus:
Branches Coming from the Medial Cord?
What is their Spinal nerves origin?

Answer 1

Brachial Plexus: Medial Cord - C8-T1

1) Ulnar Nerve
2) Medial Brachial Cutaneous Nerve
3) Medial Antebrachial Cutaneous Nerve
3) Medial Pectoral Nerve
4) Part of the Medial Nerve

Question 2

Brachial Plexus:

Radial Nerve - Cord(s) and Spinal Nerves Origin?

Answer 2

Brachial Plexus: Radial Nerve
C5-T1
Posterior Cord

Question 3

Brachial Plexus:

Axillary Nerve - Cord(s) and Spinal Nerves Origin?

Answer 3

Brachial Plexus: Axillary Nerve
C5-C6
Posterior Cord

Question 4

Brachial Plexus:

Median Nerve - Cord(s) and Spinal Nerves Origin?

Answer 4

Brachial Plexus: Median Nerve
C5-T1
Medial and Lateral Cords

Question 5

Brachial Plexus:

Ulnar nerve - Cord(s) and Spinal Nerves Origin?

Answer 5

Brachial Plexus:
Ulnar nerve C8-T1
Medial Cord

Question 6

Brachial Plexus:

Musculocutaneous nerve - Cord(s) and Spinal Nerves Origin?

Answer 6

Brachial Plexus:
Musculocutaneous nerve C5-C6
Lateral Cord

Question 7

Brachial Plexus:
Branches Coming from the Lateral Cord?
Supraclavicular Branches Coming from the C5-C6 origin?

Answer 7

Brachial Plexus: Lateral Cord

1) Musculocutaneous nerve C5-C6
2) Lateral Pectoral (C5-C7)

C5-C6: Subclavius, Suprascapular and Long thoracic

Question 8

Brachial Plexus:

Branches Coming from the Posterior Cord?

Answer 8

Brachial Plexus: Posterior Cord

1) Axillary
2) Radial
3) Subscapular

Question 9

Cervical Plexus:

What are the contributions of C1 Spinal nerve?

Answer 9

Cervical Plexus: C1

1) Hijacking Hypoglossal Nerve - Motor Branches to Geniohyoid and Thyrohyoid Muscles.
2) Gives the Superior Ramus of Ansa Cervicalis

Question 10

Cervical Plexus:

What are the contributions of C2 Spinal nerve?

Answer 10

Cervical Plexus: C2

1) Together with C3 Gives the Greater Auricular, Lesser Occipital and Transverse Cervical Nerves.
2) Gives the Inferior Ramus of Ansa Cervicalis (with C3)

Question 11

Cervical Plexus:

What are the contributions of C3 Spinal nerve?

Answer 11

Cervical Plexus: C3

1) Together with C2 Gives the Greater Auricular, Lesser Occipital and Transverse Cervical Nerves.
2) Together with C4 gives the Supraclavicular Nerves
3) Together with C4 and C5 gives the Phrenic Nerve
4) Gives the Inferior Ramus of Ansa Cervicalis (with C2)

Question 12

Cervical Plexus:
Origin of Ansa cervicalis (Deep)?
Structures innervated by it?
Where can we find it.

Answer 12

Cervical Plexus: Ansa cervicalis
C1-C3
Omohyoid, Sternohyoid and Sternothyroid Muscles.
Can be found superficial to Carotid Sheath.

Question 13

Cervical Plexus:
Origin of Phrenic Nerve ?
Structures innervated by it?

Answer 13

Cervical Plexus: Phrenic Nerve
C3-C5
Diaphragm - Motor and Sensory.
Pericardium and Mediastinal Pleura Sensory.

Question 14

Cervical Plexus: what is Erb’s Point

Answer 14

Cervical Plexus:Erb’s Point
Point where the four superficial branches of the cervical plexus—the greater auricular, lesser occipital, transverse cervical, and supraclavicular nerves—emerge from behind SCM.

Question 15

Lumbar Plexus:

3 Most superior Branches and Spinal Nerve Origin?

Answer 15

Lumbar Plexus:

1) Iliohypogastric - T12-L1
2) Ilioinguinal - T12-L1
3) Genitofemoral - T12-L2

Question 16

Lumbar Plexus:

3 Most Inferior Branches and Spinal Nerve Origin?

Answer 16

Lumbar Plexus:
1)Lateral Femoral Cutaneous - L2-L3
2)Femoral Nerve - L2-L4
3)Obturator Nerve - L2-L4
(Lumbosacral Trunk connects to Sacral Plexus L4-L5)

Question 17

Sacral Plexus:

2 Most Superior Branches and Spinal Nerve Origin?

Answer 17

Sacral Plexus:

1) Superior Gluteal Nerve -L4-S1
2) Inferior Gluteal Nerve - L5-S2

Question 18

Sacral Plexus:

3 Most Inferior Branches and Spinal Nerve Origin?

Answer 18

Sacral Plexus:

1) Sciatic Nerve L4-S3
2) Posterior Femoral Nerve L4-S3
3) Pudendal Nerve S2-S4