Question

THE NERVOUS SYSTEM

Spinal Cord & Associated Structures:

• Grey Matter

• Cauda Equina

• Anterior White Column

• Anterior Gray Horn

• Anterior Median Fissure

• Efferent Nerve

• White Matter
• Cervical Enlargement

• Lateral White Column

• Lateral Gray Horn
• Posterior Median Sulcus

• Conus Medullaris
• Lumbar Enlargement
• Posterior White Column

• Posterior Gray Horn

• Afferent Nerve

1. What type of information does an afferent nerve carry?

2. What type of information does an efferent nerve carry?

Spinal Nerve Structures:

• Dorsal & Ventral Rootlets • Dorsal & Ventral Root

• Spinal Nerve
3. Does the root of the spinal nerve carry mixed information? What about the ramus?

• Dorsal & Ventral Rami • Dorsal Root Ganglion 2. Dorsal rami only supply what area of the body?

Brachial Plexus Structures:

• Roots •

• Cords •

• Ulnar Nerve •

4. What is actually happening when you hit your “funny bone”?

• Divisions
• Median Nerve

• Axillary Nerve

Trunks Musculocutaneous Nerve

Radial Nerve

Lumbosacral Plexus Structures:

• Femoral Nerve • Superior Gluteal Nerve • Inferior Gluteal Nerve

• Sciatic Nerve

• 5.Which nerve exits out the greater sciatic foramen ABOVE the piriformis muscle?

• 6.What is the most obvious way to differentiate between sciatic nerve and inferior gluteal nerve?

carnival nerve

7. Match the cranial nerves with their associated roman numeral:

CN I CN II CN III CN IV CN V CN VI CN VII CN VIII CN IX CN X CN XI CN XII

Cranial nerves:

A. Vagus nerve
B. Trigeminal nerve
C. (Spinal) Accessory nerve D. Optic nerve
E. Olfactory nerve
F. Glossopharyngeal nerve G. Oculomotor nerve
H. Trochlear nerve
I. Abducens nerve
J. Hypoglossal nerve
K. Vestibulocochlear
L. Facial nerve

8. Indicate which cranial nerve passes through each foramen:

Ethmoid Bone
Olfactory Foramina: ___________________________________________________

Sphenoid Bone
o Optic Canal: _________________________________________________________

o Superior Orbital Fissure: _______________________________________________

o Foramen Rotundum: __________________________________________________

o Foramen Ovale: ______________________________________________________

Temporal Bone
o Internal Auditory Meatus: _______________________________________________

Occipital Bone
o Jugular Foramen: _____________________________________________________

o Hypoglossal Canal: ___________________________________________________

ANSWER ALL THE ABOVE

Answer 1

Answer 1 - Afferent nerve carries sensory information. The receptors convert various stimuli from the external environment into electrical signals. These electrical signals are transmitted by the sensory nerves to the brain for interpretation

Answer 2 - Efferent nerve carries motor information. This information travels from the brain or the spinal cord to the effector organs.

Answer 4 - No

Explanation:

• The spinal nerve is formed by 2 root
  • The ventral root
  • Dorsal root
• The ventral root carries motor information
• The Dorsal root carries sensory information.
• Both these roots arise from the spinal segment and after a short distance join together to form spinal nerve.
• Therefore, a spinal nerve has mixed ( motor and sensory) whereas the ventral root has motor nerves and the dorsal root has sensory information.
• The spinal nerve then divides into the dorsal and ventral rami. Both the rami has sensory and motor nerves in them. Therefore, they are mixed.

Answer 5 - the dorsal rami supplies the back ( motor and sensory information)

Answer 6 - The ulnar nerve travels behind the medial epicondyle of the humerus. When this part is tapped, the ulnar nerve gets stimulated. This gives a sensation of tingling and numbness long the medial border of the forearm, the medial border of the palm and the little finger.