Lumbosacral plexus - Week 3

Question 1

What is a neural plexus?

Answer 1

An intertwining network of nerves derived from several spinal nerves, that give rise to peripheral nerves that supply the structures of the arm or leg

Question 2

Where are the plexuses?

Answer 2

Ventral rami of the following regions form a plexus: Cervical, brachial, lumbar, sacral, coccygeal.

Thoracic is supplied segmentally

Question 3

What is the advantages of a plexus?

Answer 3

If one part of the spinal is damaged, a different part of the spinal cord could still give some functionality to that segment through intertwining nerves

Question 4

Hypoasthesia

Answer 4

Numbness

Question 5

Paraesthesia

Answer 5

Abnormal sensation - pins and needles or tingling

Question 6

Which part of the vertebrae holds the lumbar plexus?

Answer 6

T12 - L4

Question 7

Name the nerves that are in the lumbar plexus from superior to inferior

Answer 7

“I twice get laid on fridays”

Iliohypogastric nerve & ilioinguinal nerve (L1), Genitofemoral nerve (L1, L2), Lateral femoral cutaneous nerve (L2, L3), Obturator nerve (L2, L3, L4), Femoral nerve (L2, L3, L4)

Question 8

What is the largest nerve that arises from the lumbar plexus?

Answer 8

Femoral nerve

Question 9

What is a nerve plexus?

Answer 9

Several interconnected nerves that come together and then branch back out to serve a region of the body

Question 10

What muscles does the femoral nerve innervate?

Answer 10

Anterior hip and thigh - hip flexors & quadriceps (knee extensors)

Question 11

What muscles does the obturator nerve innervate?

Answer 11

Medial thigh - hip adductors