Nerve Anatomy and Functions

Dr. Mike provides an overview of the 31 pairs of spinal nerves and their associated plexuses. He explains the cervical, thoracic, lumbar, sacral, and coccygeal areas of the spinal cord, detailing the number of nerves in each. The video covers the cervical plexus and its role in breathing through the phrenic nerve, the brachial plexus and its arm-related nerves, and the lumbar and sacral plexuses, highlighting the femoral and sciatic nerves. Clinical relevance and potential injuries are discussed throughout.

What is the primary function of a nerve plexus?

• To protect the spinal cord

• To form a network of nerves that branch out

• To supply blood to the spinal cord

• To connect the brain to the spinal cord

How many pairs of spinal nerves are there in the thoracic region?

• 12

• 1

• 8

• 5

Which mnemonic helps remember the number of spinal nerves in each region?

• Adults work from 9 a.m. to 5 p.m.

• Children play at 10 a.m., 2 p.m., and 4 p.m.

• Young people sleep at 9 p.m., 11 p.m., and 6 a.m.

• Old people eat at 8 a.m., 12 p.m., and 5 p.m.

Which nerves form the phrenic nerve?

• C3, C4, C5

• C1, C2, C3

• C5, C6, C7

• C7, C8, T1

What is the role of the phrenic nerve?

• Facilitates leg movement

• Innervates the diaphragm for breathing

• Regulates heart rate

• Controls hand movements

Which nerve is associated with carpal tunnel syndrome?

• Ulnar nerve

• Radial nerve

• Median nerve

• Sciatic nerve

What condition is caused by impingement of the radial nerve?

• Foot drop

• Tennis elbow

• Saturday night palsy

• Carpal tunnel syndrome

Which nerve is responsible for the sensation known as the 'funny bone'?

• Ulnar nerve

• Femoral nerve

• Radial nerve

• Median nerve

Which nerve innervates the anterior thigh muscles?

• Femoral nerve

• Sciatic nerve

• Ulnar nerve

• Radial nerve

What is a common symptom of sciatic nerve impingement?

• Neck pain

• Wrist pain

• Foot drop

• Numbness in the fingers