26 Post-Lab for Brain and Cranial Nerves
Gillian Backus; Heidi W. Wangerin; and Paula Rodgers
Post-Lab for Brain and Cranial Nerves
Name: ________________________
Lab Checkout:
When you finish the lab, please clean up your lab space and put away your materials neatly in the tray. Once you have thoroughly cleaned, washed, and dried your lab table, please get your instructor’s initials to check-out of lab.
- Lab bench clean, washed, and dried
- Materials put away properly and organized in trays
- Microscope properly put away
Lab completed (% completed = ______ %) Instructor initials: ______________
Activity 1: The Structure and Function of the Brain
1. Identify the brain part that corresponds to its description. Use the following word bank: Temporal lobe, frontal lobe, parietal lobe, occipital lobe, cerebrum, diencephalon, brain stem, midbrain, hypothalamus, arachnoid granulations, longitudinal fissure, central sulcus, corpus callosum, pituitary gland, thalamus, optic chiasma, olfactory bulb, infundibulum. Each word may be used once or not at all. No word may be used more than once.
-
- contains the hypothalamus __________________________________________
- lobe that controls equilibrium and balance _______________________________
- fissure that separates the left and right halves of the brain __________________
- tract that connects the left and right hemispheres of the brain _______________
- stores and releases many of the body’s hormones ________________________
- lobe that contains Broca’s area _______________________________________
- controls heart rate, respiratory rate and temperature ______________________
- superior and inferior colliculi make up this structure _______________________
- collects cerebrospinal fluid after it has circulated around the brain and spinal cord _______________________
- enlarged portion of sheep brain responsible for smell ______________________
- where the optic nerve and the optic tracts cross __________________________
Activity 2: The Meninges and Flow of Cerebrospinal Fluid
2. Name the three meningeal layers from superficial to deepest.
3. Use the text provided to trace the path of cerebrospinal fluid from its formation to its return to the venous circulation by completing this fill-in-the blank series.
The choroid plexus is lined with (a)________________________________ cells that filters blood to produce (b) _______________________________. The (c)_____________________________ ventricles are paired ventricles found in each cerebral hemisphere. CSF. They connect to the third ventricle by the (d)_____________________________. The third and fourth ventricles are connected by a structure called the (e)__________________________________. CSF reaches the subarachnoid space by tiny holes called (f)__________________________________ and also circulates in the center of the spinal cord through a structure called the (g)________________________________________. To recycle the CSF, it is pushed through the (h)__________________________________________ into the sagittal sinus.
Activity 3: Dissection of a Sheep Brain
| Structure | Brain Region (cerebrum, diencephalon, cerebellum, brainstem) |
| Thalamus | |
| Pons | |
| Arbor vitae | |
| Occipital lobe | |
| Inferior colliculus |
Activity 4: Identify the Cranial Nerves
5. Name the four cranial nerves which play a role in both motor function and sensation (which four are “mixed”).
6. Match the cranial nerve below with its function (put all that apply).
| ___ controls lateral eye movement and constricts the pupil
___ directly involved in chewing ___ involved in swallowing and regulating internal organs, and taste ___ rotates the head ___ controls movement of tongue ___ involved in taste of the posterior of the tongue ___ Sensory for smell ___ sensory for hearing ___ sensory for vision ___ detects stimulation on the face |
a. oculomotor
b. vagus c. optic d. glossopharyngeal e. facial f. accessory g. olfactory h. hypoglossal i. trigeminal j. vestibulocochlear |
7. List all of the nerves involved in the following (list all involved)
-
- taste
- swallowing
- eye movements
Activity 5: Evaluate Cranial Nerve Function
8. Given the results of a series of cranial nerve tests, determine which cranial nerve(s) is/are impaired.
____________________________ eye does not move medially and droopy eyelid
____________________________strong pain sensation in the buccal region
____________________________ inability to swallow and voice is hoarse (rough)
____________________________ tongue drifts to the right side
____________________________ asymmetrical smile (only on left side)
____________________________ inability to rotate head to the left
____________________________sensations of vertigo (dizziness)
