Peripheral Nervous System Lecture 2

Question 1

Cervical part:

Answer 1

Crunchy breakfast (cereal) at 7 am ➞ cervical vertebrae
1. There are 8 cervical spinal nerves. (One comes from occipital)
2. Cervical enlargement. (Goes down to arms and legs): contains neurons that innervate the upper limbs

Question 2

thoracic part:

Answer 2

Tasty lunch at 12pm (12 Thoracic vertebrae)
1. 12 thoracic nerves (&vertebrae)
Thoracic nerves ➞ innervate the chest

Question 3

Lumbar part:

Answer 3

1. 5 Lumbar nerves. (5pm ➞light dinner)
2. Lumbosacral enlargement: contains neurons that innervate the lower limbs.

Question 4

Sacral part:

Answer 4

1. Conus medullaris: the end of the spinal cord.

Question 5

Cauda Equina
↓ ↓
Caudal Horse

Answer 5

1. A collection of nerve roots(horse tail).
2. Filum terminale: pia mater anchor for the conus medullaris (stabilization)

Question 6

Spinal Nerve Distribution:
Cervical (7) plexus……..

Answer 6

1. Formed by anterior rami of C1-C4 (forms a plexus)
2. Contains PHRENIC NERVE (INNERVATES THE DIAPHRAGM)

Question 7

Spinal nerve distribution:
Brachial plexus

Answer 7

1. Formed by the anterior rami of C5-T1.
2. Posterior cord:
   axillary nerve (innervates the deltoid and Teres minor muscles)
   AND
   radial nerve (innervates the posterior arm and forearm muscles
3. Lateral cord: branches ➞ musculocutaneous nerve: innervates the biceps brachii and brachioradialis muscles
4. Medial cord:ulnar nerve (innervates some of the anterior… pause ask prof