A & P 2 - Class 9 - CN V & VII, Roots, Rami, Intercostal Nerves

Question 1

Name of CN V?

Answer 1

Trigeminal

Question 2

Function of Trigeminal nerve?

Answer 2

touch, pain and temperature sensations and proprioception (muscle sense); chewing

Question 3

CN V: motor, sensory or mixed?

Answer 3

mixed

Question 4

The sensory part of the Trigeminal nerve consists of _____ branches.

Answer 4

3; ophthalmic nerve, maxillary nerve, mandibular nerve

Question 5

CN V: sensory part: ophthalmic nerve: axons from?

Answer 5

scalp and forehead skin

Question 6

CN V: sensory part: maxillary nerve: axons from?

Answer 6

lower eyelid, nose, upper teeth, upper lip, and pharynx

Question 7

CN V: sensory part: mandibular nerve: axons from?

Answer 7

tongue, lower teeth, lower side of face

Question 8

CN V: motor part: axons from?

Answer 8

somatic motor neurons that innervate muscles used in chewing

Question 9

Name of CN VII?

Answer 9

Facial

Question 10

Function of Facial nerve?

Answer 10

taste (anterior tongue), proprioception (muscle sense), touch, pain, temperature sensations; facial expressions, secretion of tears and saliva

Question 11

CN VII: motor, sensory, or mixed?

Answer 11

mixed

Question 12

CN VII: sensory part: axons from?

Answer 12

taste buds on anterior tongue AND proprioceptors in muscles of face and scalp

Question 13

CN VII: motor part: axons from?

Answer 13

somatic motor neurons that innervate facial, scalp, and neck muscles plus parasympathetic axons that stimulate lacrimal (tear) glands and salivary glands

Question 14

Name all the cranial nerves that are mixed.

Answer 14

V-Trigeminal, VII-Facial, IX-Glossopharyngeal, X-Vagus

Question 15

Two bundles of axons, called ________, connect each spinal nerve to a segment of the cord by a series of small rootlets.

Answer 15

roots

Question 16

What is another name for the posterior root?

Answer 16

dorsal

Question 17

The posterior or dorsal root contains ONLY what type of axons?

Answer 17

sensory

Question 18

What is the purpose of the sensory axons in the dorsal root between the spinal cord and spinal nerve?

Answer 18

conduct nerve impulses for sensations from the skin, muscles and internal organs into the CNS.

Question 19

What is another name for the anterior root?

Answer 19

ventral

Question 20

The ventral or anterior root contains axons of…?

Answer 20

somatic motor neurons AND autonomic motor neurons

Question 21

What does the anterior root axons of somatic motor neurons conduct?

Answer 21

nerve impulses from the CNS to effectors (muscles and glands).

Question 22

What does the anterior root axons of autonomic motor neurons conduct?

Answer 22

smooth muscle, cardiac muscle and glands

Question 23

Spinal nerves are: motor, sensory, mixed?

Answer 23

mixed

Question 24

Define ramus?

Answer 24

soon after each spinal nerve emerges from the spinal cavity, it forms several branches, each of which is called a ramus.

Question 25

What does ramus mean?

Answer 25

Branch

Question 26

What is the function of the dorsal ramus?

Answer 26

Supplies somatic motor and sensory fibers to several smaller nerves. these smaller nerves, in turn, innervate muscles and skin of the posterior surface of the head, neck, and trunk.

Question 27

Remember: dorsal root ganglion =

Answer 27

Cell bodies of sensory neurons

Question 28

ALL ARE MIXED NERVES- ramus or root?

Answer 28

Ramus

Question 29

What is the name of the posterior branch of the Ramus?

Answer 29

Dorsal ramus

Question 30

The anterior branch of the Ramus?

Answer 30

Ventral ramus

Question 31

Do rami join together to form plexuses?

Answer 31

No

Question 32

Intercostal nerves include which spinal nerves?

Answer 32

The anterior rami of spinal nerves T2 - T12, where there is no plexus formation

Question 33

How are the intercostal nerves different than other spinal nerves?

Answer 33

They connect directly to the structures they supply in the intercostal spaces

Question 34

Where are the roots?

Answer 34

Inside of the vertebral canal where spinal nerves attach to the spinal cord

Question 35

Where is the only location outside of the spinal cord where sensory and motor fibers are bundled sparately?

Answer 35

Roots

Question 36

What type of fibers split away from the ventral ramus and head toward a ganglion of the sympthetic chain?

Answer 36

Autonomic motor fibers

Question 37

What is the difference between a ventral root and a dorsal root?

Answer 37

The dorsal root ONLY contains sensory axons; ventral root contains axons of somatic motor neurons and atonomic motor neurons

Question 38

What is the difference between a dorsal root and a dorsal rami?

Answer 38

Root is the connection between the spinal nerve and the spinal cord; ramus is the spinal nerve emerging from the spinal cavity to form a branch.

Question 39

What structures do dorsal rami innervate?

Answer 39

Deep Muscles and skin of the posterior surface of the head, neck and trunk.

Question 40

What do the ventral rami of T2 - T12 form and innervate?

Answer 40

Muscles of the anterior skin and thoracic area.

Question 41

What does plexus mean?

Answer 41

Braid or network