Nervous System and Sense Organ
Make sure to study the materials and models on display, especially note comparisons between
systems of vertebrate groups.
A. Nervous System
Study Fig. 22-27 -see pp. 152-154 (364-366) showing the brain in lab book; examine the
sheep brains on display to find the following. Know:
hypophysis = pituitary gland
2. Histology – review nerve slides:
a) Motor nerve cells: Study slide #15 (smear of tissue from ox spinal cord) -
see Fig. 4-15A in lab book.
b) Peripheral nerve: Study slide #16 (cross section and longitudinal section
of peripheral nerve) see Fig. 4-15D in lab book.
Remind teacher to show kodacolor slides and overhead transparencies of
nerve tissue to point out main features and histology of nerve tissue to
and to explain a how a motor nerve works. (Also refer to Fig. 4-15A in
lab book). Know:
- axon (takes message away from cell body)
- dendrite (takes message toward cell body)
- cell body
- cell nucleus
- nuclei of glial cell (glial cells are supporting cells)
- myelin sheath
- nodes of Ranvier
- neurilemma (spelled neurolemma in textbook)
- Schwann cell
B. Sense Organs
1. Ear: examine ear models on display. Read pp. 327-330 in lecture text; see Figs.
33-25, 33-26, and 33-29 in lecture textbook; parts & functions to know:
outer, middle, and inner ear
external auditory meatus
hammer - malleus
anvil – incus
stirrup - stapes
Remind teacher to use overheads to explain ear structure and how it works.
2. Eye. Cow eyes are available for dissection; have teacher demonstrate before
you do your dissection-see pp. 330-333 in textbook; see Figs. 33-32 and 33-33;
parts & functions to know:
Remind teacher to use overheads to explain eye structure and how it works.
Other helpful hints:
1. Note kidney model and other models are still on display/demonstration – be sure to review for
upcoming final lab exam.
2. Review for lab final exam: birds, bones, pig dissection, mammals, models, nervous system,
ear, and eye. Kodacolor slides of human anatomy are also a very good review for the lab test.
3. The VCR tape of the pig dissection is also available for in-lab use.