Department of Zoology
Southern Illinois University at Carbondale
ZOOL 409, Lab Week 6
Lab notes offer a preview of upcoming labs and links to more information about tissues examined during lab.
- Week 6 lecture notes
- SYLLABUS (including links to all note pages)
- 409 Homepage (index of course resources)
- Dr. King's School of Medicine histology page
- Slide summary
TUESDAY and THURSDAY
Primary objectives:
- Examine skin and recognize its various tissue components.
- Slide 10, peculiar skin (no glands, no hair, with strands of smooth muscle), but nice epidermis.
- Slide 43, scalp (lots of large hair follicles and sebaceous glands).
- Slide 89, "thick skin" (from palm of hand or sole of foot); thick epidermis; no hair nor sebaceous glands. In most boxes, this slide includes Meissner's corpuscles (in dermal papillae) and Pacinian corpuscles. Also, elastic fibers are stained on this slide, and myoepithelial cells are visible in sweat glands.
- Slide 92, skin with large apocrine sweat glands as well as ordinary (eccrine) sweat glands. This slide also may have a small site of inflammation.
Compare / contrast skin with the following slides. Notice similarities, such as basic tissue layers. Then look for differences. What features on these slides are NOT found in skin? And what features of skin are NOT found on these specimens?
- slides 07, 68, 85 -- esophagus.
- slides 46 -- tongue.
- slide 56 -- vagina.
- Components to identify:
- layers of epidermis (most distinct in slide 89)
- basal layer (stratum basale / stratum germinativum)
- "prickly cell" layer" (stratum spinosum)
- granular layer (stratum granulosum)
- cornified layer (stratum corneum)
- underlying layers
- papillary layer of dermis, dermal papillae
- reticular layer of dermis
- hypodermis, or subcutaneous adipose
- cell types
- In epidermis -- keratinocytes , notice cell-cell junctions most clearly on slide 10;
also notice that other, non-keratinocyte cells are also present).- In dermis -- see if you can find distinct cell types (e.g., fibroblasts, macrophages, lymphocytes, mast cells -- see connective tissue cells).
- SPECIAL STRUCTURES
- sweat glands (in slides 43, 89, 92)
- hair follicles (in slides 43, 92)
- sebaceous glands (in slides 43, 92)
- arrector pili muscles (small bundles of smooth muscle for piloerection, should be present in slides 43, 92)
- vasculature
- Meissner's corpuscles and Pacinian corpuscles (on slide 89)
- nerves (deep in dermis)
Complete slide list:
01, 02, 03,
04, 05, 06,
07, 08, 09,
10, 11, 12,
13, 14, 15,
16, 17, 18,
19, 20, 21,
22, 23, 24,
25, 26, 27,
28, 29, 30,
31, 32, 33,
34, 35, 36,
37, 38, 39,
40, 41, 42,
43, 44, 45,
46, 47, 48,
49, 50, 51,
52, 53, 54,
55, 56, 57,
58, 59, 60,
61, 62, 63,
64, 65, 66,
67, 68, 69,
70, 71, 72,
73, 74, 75,
76, 77, 78,
79, 80, 81,
82, 83, 84,
85, 86, 87,
88, 89, 90,
91, 92, 93,
94, 95, 96,
97, 98, 99,
100
Comments and questions: dgking@siu.edu
Department of Zoology e-mail: zoology@zoology.siu.edu
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