Lecture 7 Flashcards
What are the 5 receptors in the skin (the somatosensory system)?
Collectively called cutaneous receptors (Hair follicle, free nerve endings, Meissner’s corpuscles, Ruffini’s corpuscles and Pacinian corpuscles)
What are the somatosensory pathways to the brain?
Spinothalamic tract, and Dorsal Column (medial lemniscus)
What are the photoreceptors of the eye, and what environmental stimuli do they detect?
Rod cells and cone cells; light
What are the receptors in the skin collectively referred to?
What environmental stimuli do hair follicles detect?
fine touch and vibration
What environmental stimuli do free nerve endings detect?
pain and temperature (hot and cold)
What environmental stimuli do Meissner’s corpuscles detect?
low-frequency vibrations and touch
What environmental stimuli do Ruffini’s corpuscles detect?
What environmental stimuli do Pacinian corpuscles detect?
high-frequency vibrations and touch
The spinothalamic tract transmits information dealing with what?
basic sensations of pain, temperature, and crude touch
The dorsal column transmits information dealing with what?
advanced sensations of fine detailed touch, proprioception, and vibration
Where is the somatosensory cortex located?
in the parietal lobe on the POSTCENTRAL gyrus behind the central sulcus.
What types of cells does the retina contain (aside from rod and cone cells)?
bipolar cells, ganglion cells, horizontal cells, and amacrine cells
What are the four types of eye movements?
Saccades, Smooth Pursuit, Vestibular Ocular Reflex (VOR), and Vergences
Which receptors detect touch?
Ruffini corpuscles, Merkel’s disks, Meissner’s corpuscles, and Pacinian corpuscles