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BIO121 Week 6 Lecture Notes

by: BenWilliams

BIO121 Week 6 Lecture Notes Bio 121

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About this Document

These are notes from 9/26-9/30 Disclaimer: These materials are the interpretation of lecture. The materials are not direct products of Professor Erbach.
Anatomy and Physiology
Class Notes
anatomy, Physiology, Biology
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This 2 page Class Notes was uploaded by BenWilliams on Friday September 30, 2016. The Class Notes belongs to Bio 121 at Parkland College taught by Erbach in Fall 2016. Since its upload, it has received 9 views. For similar materials see Anatomy and Physiology in Natural Sciences at Parkland College.


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Date Created: 09/30/16
Week 6 Lecture Notes 9/26-9/30 I. Components of Integumentary System A. Cutaneous Membrane 1. Epidermis a) Stratified squamous epithelia 2. Dermis a) Papillary layer- areolar connective tissue b) Reticular layer- dense regular connective tissue B. Accessory Structures 1. Hair, nails, exocrine glands, sebaceous glands, sweat glands, nerves, arrector pili muscles, blood vessels, etc. C. Hypodermis (technically not a part of the integument) 1. Subcutaneous tissue that separates integument from deep fascia D. Most abundant cell type- keratinocytes II. Nerve Types A. Tactile corpuscles 1. Sensitive to light touch 2. In the papillary layer of epidermis B. Lamellated corpuscles 1. Sensitive to deep pressure 2. In the deep dermis or hypodermis C. Tactile discs 1. Sensitive to light touch 2. In the deep epidermis D. Free nerve endings 1. Sensitive to pain and temperature 2. In the epidermis III. Functions of the Integumentary System A. Protection B. Excretion C. Temperature regulation D. Produce melanin and keratin E. Vitamin D synthesis F. Store lipids G. Sensory input IV. Deep Epidermal Layers A. Stratum basale 1. Deepest layer 2. Contains basal cells (stem cells) B. Stratum spinosum 1. Contains dendritic cells (immune response cells) C. Stratum granulosum 1. Area where cells stop dividing and only produce keratin D. Stratum lucidum 1. Only found in thick skin 2. Contains dead cells filled with keratin E. Stratum corneum 1. Outermost layer 2. Water resistant layer V. Thick and Thin Skin A. Thick 1. Found in palms of hands and feet 2. 5 strata thick B. Thin 1. Found on most of the body 2. 4 strata thick VI. Skin Color A. Factors that affect skin color 1. Pigments a) Carotene- orange/yellow and collects in epidermis b) Melanin- yellow/brown/black, produced in stratum basale, and provides protection from UV radiation by shading nuclei (1) Eumelanin (2) Pheomelanin c) Albinism- lack of melanin production 2. Blood circulation a) Subpapillary plexus- blood vessels in the dermis b) Cutaneous plexus- blood vessels in hypodermis 3. Keratinization 4. UV exposure a) UV radiation is a collection of high energy particles that can alter the structure of molecules, including DNA


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