Gross Anatomy of the Central Nervous System

Topics: Brain, Central nervous system, Cranial nerves Pages: 5 (721 words) Published: June 18, 2013
Gross Anatomy of the Central Nervous System

Laszlo Vass, Ed.D. Version 42-0011-00-01

Lab RepoRt assistant

This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.

What is the purpose of this exercise?

Are there any safety concerns associated with this exercise? If so, list what they are and what precautions should be taken.

Questions: Exercise 1 Structures of the Brain

A. Label the terms from Figure 2 of the Discussion and Review on this Lateral View of the Brain below.


B. Label the terms from Figure 4 of the Discussion and Review on this Midsagittal View of the Brain below.

C. Label the terms from Figure 6 of the Discussion and Review on this Ventral View of the Brain below. [pic]

D. Label the brain association terms from Figure 3 of the Discussion and Review on this Lateral View of the Brain below.

Questions: Exercise 2 The Sheep Brain Dissection

A. Which of the four major areas of the brain (cerebrum, diencephalon, cerebellum and brain stem) was obviously much larger in the human brain diagram than in the sheep brain? Why do these structures differ so dramatically?

Human- cerebrum larger than sheep; higher cortical function capability to match need. Other areas reflect
relatively equal importance to the two species.

B. What is the significance of the size difference in the olfactory bulbs between humans and sheep?
Sheeps require heightened smell; humans are primarily visually-oriented and thus have decreased need
for high olfactory sensation.

C. The human cerebellum is split in half while the sheep cerebellum is one mass. Why does this structural difference exist?
More complex movement, coordination & integration required by humans.

D. What is the significance in the size difference between the sheep and human brain stems?
Brain stems is major hub to link the various processes and activities; humans have more complex sensory
and motor requirements.

E. What is the function of the third ventricle, fourth ventricle, cerebellum, and brain stem?

Third ventricle- protection of the brain from trauma; pathway for circulation of cerebrospinal fluid
Fourth ventricle- forms central canal of spinal cord; protects brain from trauma
Cerebellum- fine movement coordination; balance & equilibrium; muscle tone
Brain stem- alertness; arousal; breathing; blood pressure; digestion; heart rate; other autonomic functions;
relays information between the peripheral nerves and spinal cord to the upper parts of the brain

F. In your own words, explain how (if) this exercise helped you better understand brain anatomy.

This exercise really only helped in differentiating brain anatomy between different species.

Exercise 3: The Cranial Nerves

Fill in the following information about the twelve cranial nerves:

| | |Is it Sensory/Motor/ | |Cranial Nerve |Function |Both? | |I. Olfactory |Smell |Sensory | |II. Optic...
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