CAS BI 325 Chapter Notes - Chapter 12: Glabrousness, Dermis, Epithelium
2 Jan 2018
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Receptors distributed throughout body rather than specialized locations. 4 senses (touch, temperature, pain, body position(proprioception)) -skin prevents evaporation of body fluids into environment. Sensitive to physical distortion such as stretching and bending. -all have unmyelinated axon branches sensitive to stretching, bending, pressure, or vibration. Deep in dermis; highest density in the fingers. Consist of nerve terminal and flattened non-neuronal epithelial cell. In b/w dry skin and mucous membranes nerve terminals appear as. Krause"s end bulbs knotted balls of string. Hairs grow from (terminations of single axons) Follicles embedded in skin which is innervated by free nerve endings. If a dorsal root is cut, corresponding dermatome will not lose complete sensation. Inner gray matter core; thick covering of white matter tracts referred to as . (cranial nerve v), that enter brain @ sensations originating from opposite side of the body. **information is altered every time it passes through a set of synapses in the brain.
