ANAT 321 Lecture Notes - Lecture 3: Lamellar Corpuscle, Golgi Tendon Organ, Bulbous Corpuscle
9 Sep 2016
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Free nerve endings - some are activated by temperature, other by pain, damage, etc. Ion channels in each type of receptor ending transduce a particular stimulus into changes in membrane potential (typically depolarization: eg. Touch-sensitive endings contain stretch-activated ion channels, whereas temperature sensitive endings contain ion channels that are activated over specific ranges of temperature. It processes the information from the lines relative to other stimuli - my hand is only hot because the rest of my skin is a lower temperature. The primary somatic sensory neurons innervate a specific region of the body surface by branching out endings: a stimulus within this receptive field will excite the cell. Each neuron in the pathway has a receptive field. Some terms: medial - on/near the midline. Lateral - on either side of the midline: dorsal - back, ventral - stomach, rostral/anterior - front, caudal/posterior - end.
