100 b between the dura mater and arachnoid 0 c in the

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Unformatted text preview: ck absorption and insulation Many organs including the heart, eyes, kidneys, and spleen. Dense regular Arranged in an irregular pattern Provides strength and withstands stress. Deep layers of the skin’s dermis, GI tract, capsules of synovial joints. Dense irregular Almost entirely collagen fibers, densely packed Strongest connective tissue Tendons, ligaments, aponeuroses, fascia, fibrous joints Reticular Delicate fibers forming interlacing networks Internal support Kidneys, spleen, liver and other soft organs Cartilage (hyaline, elastic, fibrocartilage) Avascular, gel like Cushioning, and joint lubrication Hyaline-nose, ribs, articular cartilage. Elastic- epiglottis and ear Fibrocartilage- intervertebral disks and the symphysis pubis The Skin Match the number of each structure in the skin diagram with its name on the chart, then describe the characteristics or functions of each. The first one has been done as an example. Number 1 2 epidermis Reticular layer of dermis Sebaceous gland 3 Hair root 4 Hypodermis (as well as adipose tissue) Dermal papillae 5 Meissner’s corpuscle Eccrine glands 7 Arrector pili muscle 9 Pacinian corpuscle 10 6 8 Characteristics The outer layer of the skin, composed of stratified squamous epithelium Made of areolar and dense irregular connective tissue. Contains many of the nerves, sensory corpuscles, hair follicles, and numerous glands. Secrete oily substance called sebum which prevents dehydration. They connect to hair follicles over most of the skin Anchors hair, area of new hair cell growth The hypodermis is mostly made up of adipocytes. It is also called the subcutaneous layer Extension of dermis into epidermis. Contain vascular loops and specialized nerve endings Light touch receptors that are attached to nerve endings that produce action potentials. Found extensively in skin and aids in thermoregulation. It secretes primarily water with little amounts of salts and urea. Found in dermis and attached at one end to the hair root and the other end to basement membrane of epidermis. Able to raise hairs during thermoregulation and stressful situations Responds to pressure and vibration. Found in subcutaneous tissue as well as mesenteries and near joints. BIOL 237 Case History 1 A 27 year old man, who works outdoors, notices a growth on the skin which includes a darkly pigmented spot surrounded by a halo of inflamed skin. This man has a very fair complexion, with numerous freckles and blond hair. Because of his job and recreational interests he spends a great deal of time outdoors and often gets sunburned in the summer time. The pigmented spot was removed surgically and sent for biopsy. It was determined to be malignant, but there was no evidence of metastasis. 1. 2. 3. 4. 5. What is the most likely diagnosis of the condition described. Explain. Describe the normal histology of the epidermis which relates to this condition. Where do melanocytes originate, and where do they reside after migration. Describe the differences in metabol...
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This note was uploaded on 01/29/2013 for the course BIOL 239 taught by Professor Swan during the Fall '12 term at New Mexico.

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