The Vertebral Column pt. 2

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PART 2 DROP-DOWN QUESTIONS

Take a moment to review what you’ve been learning!
Test your understanding and track your progress with these checkpoints.

Use them to reinforce your knowledge and identify areas that may need more attention.

What is the spinal cord, and where does it extend?

The spinal cord is a cylindrical structure about 45 cm long that extends from the brainstem to the first lumbar vertebra (L1).

How is the spinal cord protected?

It is protected by the vertebrae, meninges (dura mater, arachnoid mater, pia mater), and cerebrospinal fluid (CSF), which cushions it from injury.

What are the functions of gray matter and white matter in the spinal cord?

Gray matter processes signals, while white matter transmits sensory and motor information through ascending and descending tracts.

What are the main tracts in the spinal cord, and what do they do?

The corticospinal tract controls voluntary motor movements, while the spinothalamic tract carries pain and temperature sensations.

What is a spinal reflex, and why is it important?

A spinal reflex is an automatic, involuntary response that occurs without brain involvement, providing quick protective actions like the withdrawal reflex.

What happens if the spinal cord’s blood supply is interrupted?

Ischemia or infarction can occur, leading to neurological deficits.

How many pairs of spinal nerves are there, and how are they distributed?

There are 31 pairs of spinal nerves:

8 cervical
12 thoracic
5 lumbar
5 sacral
1 coccygeal

What are the two roots of a spinal nerve, and what do they do?

The ventral root carries motor signals from the brain to muscles, and the dorsal root carries sensory signals from the body to the brain.

What happens to spinal nerves after they exit the spinal canal?

They divide into the posterior primary ramus (supplying back muscles and skin) and the anterior primary ramus (supplying the front of the body and forming plexuses).

What is the cauda equina, and what does it do?

The cauda equina is a collection of nerve roots that extend beyond the spinal cord to innervate the lower body and pelvic organs.

What are the possible effects of cauda equina damage?

It can lead to bowel and bladder dysfunction and sensory loss in the lower limbs.

How do spinal nerves contribute to the autonomic nervous system?

They help regulate involuntary functions such as heart rate, digestion, and glandular activity.

What are dermatomes and myotomes?

Dermatomes are specific skin regions innervated by spinal nerves, while myotomes are muscle groups controlled by them.

What is the sciatic nerve, and why is it significant?

It is the largest and longest nerve in the body, extending from the lower back to the feet.

What are reflex pathways, and what are their functions?

Reflex pathways allow rapid, involuntary responses, such as the patellar reflex for posture and the withdrawal reflex for protection.

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