Lab Dissector and Case Studies

Question 1

Can a subdural hematoma be detected by LP?

How about a subarachnoid hemorrhage?

Answer 1

No.

Yes, bloody or yellow fluid

Question 2

What is the reason for the cervical and lumbar enlargements?

Answer 2

brachial plexus and sacral plexuses come off to supply limbs

Question 3

Why is there relatively little gray matter in the thoracic level compared with the cervical and lumbar?

Answer 3

Cervical and Lumbar regions have more gray matter as that is the home for the motor neurons going to arms/legs

Question 4

Why is there more white matter as you ascend the spinal cord?

Answer 4

cervical region needs the most white matter because that is where many of the axons going to the brain or the rest of the body pass through

lower segments have less because there is less “stuff” needing to pass through them.

Question 5

Is there any evidence for white matter within the gray?

Answer 5

yes, few myelinated axons within gray matter

Question 6

What does the sulcus limitans do?

Answer 6

separates the basilar and alar plate (embryo)

Question 7

What is the vagal trigone?

What is the hypoglossal trigone?

Answer 7

Overlies dorsal motor nucleus of the Vagus N.

Overlies the motor nucleus of the hypoglossal N.

Question 8

General somatic afferents (GSA) convey afferent impilses from

Answer 8

skin, bone, SKM, joints, lig., tendons

Question 9

General visceral afferent (GVA) convey afferents from

Answer 9

visceral receptors, carotid body/sinus, organs

Question 10

special afferents convey afferent fibers from

Answer 10

chemical receptors (taste, smell, sight, hearing/balance)

Question 11

general somatic efferents (GSE) send efferents to

Answer 11

SKM of nonbranchiometric origin like eye/tongue

Question 12

General visceral efferent (GVE) sneds fibers to

Answer 12

ANS, smooth and cardiac muscles, glands

Question 13

Special Visceral Efferent (SVE) sends efferents to

Answer 13

branchial arch muscles (mastication, facial, pharynx/larynx)