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Four of the cranial nerves serve the eye directly: one sensory and three motor nerves. The optic nerve is sensory and crosses the midline in the optic chiasm. The oculomotor nerve, trochlear nerve, and abducens nerve are motor nerves that control one or more of the eye muscles. The oculomotor nerve crosses the midline before leaving the central ...
One possible reason for this is that its environment is partly maze-like and consistently turning in one direction is a good way to search and exit mazes without getting lost. [34] This turning bias is correlated with slight asymmetries in the ants' compound eyes (differential ommatidia count).
Each gap junction (sometimes called a nexus) contains numerous gap junction channels that cross the plasma membranes of both cells. [11] With a lumen diameter of about 1.2 to 2.0 nm, [2] [12] the pore of a gap junction channel is wide enough to allow ions and even medium-size molecules like signaling molecules to flow from one cell to the next, [2] [13] thereby connecting the two cells' cytoplasm.
The simplest form of a unidirectional network is a modified, fiber-optic network link, with send and receive transceivers removed or disconnected for one direction, and any link failure protection mechanisms disabled. Some commercial products rely on this basic design, but add other software functionality that provides applications with an ...
For instance, body language can be used to establish personal space, which is the amount of space needed for oneself in order to be comfortable. Taking a step back can therefore be a social cue indicating a violation of personal space. People pay attention to motion cues even with other visual cues (e.g. facial expression) present.
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This figure shows nerve activity associated with rotational-induced physiologic nystagmus and spontaneous nystagmus resulting from a lesion of one labyrinth. Thin straight arrows show direction of slow components, thick straight arrows show direction of fast components, and curved arrows show direction of endolymph flow in the horizontal semicircular canals.
Earth’s inner core, a red-hot ball of iron 1,800 miles below our feet, stopped spinning recently, and it may now be reversing directions, according to an analysis of seismic activity.