BIOL 1410- Integumentary System Exam Guide Graded A 2024

integumentary system includes ___ - skin hair nails glands nerves (sensory receptors) skin consists of ___ - epidermis and dermis epidermis - epithelial tissue derived from the ectoderm stratified squamous epithelium acascular dermis - connective tissue (proper) derived from mesoderm vascular contains nerves, glands, and hair follicles layers of epidermis beautiful skin gets lovely compliments - stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum stratum basale - single later of cells that has a basal layer 90% of cells in this layer are keratinocytes 8% of cells in this layer are melanocytes these cells mitotically divide stratum spinosum - several layers thick with limited cell division melanin granules scattered throughout with many keratinocytes layered atop one another stratum granulosum - dark granules are seen within this layer, 3-5 layers thick all cell layers above are too far above the blood supply to maintain life stratum lucidum - very visible in thick skin 2-3 layers thick, dead clear cells, flat appears as clear band of cells stratum corneum - outermost layer of epidermis that protects and maintains moisture. 30 layers thick flat and keratin filled that provides strength these cells shed and are replaced through mitotic division thin skin - stratum lucidum is not visible has hair follicles, sweat glands and sebaceous glands thick skin - stratum lucid is visible no hair follicles, no hair or sebaceous glands sweat glands found here include palms of hands and soles of feet layers of the dermis - 1. papillary layer 2. reticular layer papillary layer - the outer layer of the dermis, directly beneath the epidermis composed of loose, areolar connective tissue