Exam 3 Spinal cord SG (pt2)

Question 1

Which spinal nerve components form intercostal nerves?

Answer 1

Anterior rami of spinal nerves T2 – T12

Question 2

What structures do intercostal nerves supply?

Answer 2

These nerves connect directly to the structures they supply:

• intercostal muscles
• abdominal muscles
• skin overlying those muscles

Question 3

What structures do posterior rami of thoracic nerves supply?

Answer 3

deep back muscles and skin of the posterior aspect of the thorax

Question 4

Name the subunits of the plexuses.

Answer 4

Roots
Trunks
Divisions
Nerves

Question 5

How are the roots of plexus subunit formed?

Answer 5

From the spinal cord

Question 6

How are the trunks of plexus subunit formed?

Answer 6

By union of roots with:

Superior trunk
Middle trunk
Inferior trunk

Question 7

How are the divisions of plexus subunit formed?

Answer 7

By branching trunks:

Anterior division
Posterior division

Question 8

How are the nerves of plexus subunit formed?

Answer 8

By extending to the body part innervated

Question 9

Name the spinal nerves that contribute to the phrenic nerve.

Answer 9

C3, C4, C5

Question 10

Above what spinal cord level does complete severing result in respiratory arrest?

Answer 10

the spinal cord above the origin of the phrenic nerve (C3, C4, C5)

Question 11

What physical manifestation indicates radial nerve injury?

Answer 11

Wrist drop, which is the inability to extend the wrist and fingers

Question 12

What causes radial nerve injury?

Answer 12

improperly administered intramuscular injections into the deltoid muscle or by a cast applied too tightly around the mid-humerus

Question 13

What are the two nerves that comprise the sciatic nerve?

Answer 13

The tibial and common fibular nerves

Question 14

What does the sciatic nerve supply?

Answer 14

muscles of the leg, foot, and toes

Question 15

How does injury to the sciatic nerve manifest itself?

Answer 15

sciatica, pain that may extend from the buttock down the posterior and lateral aspect of the leg and into the food.

Question 16

Name the region of the body supplied by the brachial plexus

Answer 16

The shoulders and upper limbs

Question 17

Name the region of the body supplied by the cervical plexus

Answer 17

The skin and muscles of the head, neck, superior portion of the shoulders, and chest, and the diaphragm

Question 18

Name the region of the body supplied by the lumbar plexus

Answer 18

The anterolateral abdominal wall, external genitals, and part of the lower limbs

Question 19

Name the region of the body supplied by the sacral plexus

Answer 19

The buttocks, perineum, and lower limbs

Question 20

What is the dermatome of the face and scalp?

Answer 20

Cranial nerve V, Trigeminal

Question 21

What is the causative agent of shingles?

Answer 21

Herpes zoster

Question 22

What nervous tissue does shingles affect?

Answer 22

Posterior root ganglion

Question 23

How is shingles associated with dermatomes?

Answer 23

causes pain, skin discoloration, and a line of blisters on the skin coinciding with dermatomal distribution of the sensory nerve to posterior root ganglion

Question 24

What are the two principal functions of the spinal cord are in maintenance of homeostasis?

Answer 24

Nerve impulse propagation
Information integration (processing)

Question 25

What part of the spinal cord carries out each of the functions (in maintenance of homeostasis)?

Answer 25

Gray matter and white matter?