ANAT 312 Lecture Notes - Lecture 6: Endolymphatic Sac, Membranous Labyrinth, Scarpa'S Ganglion
26 Nov 2016
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Document Summary
Sensory cells, ganglia, vestibular portion of cn viii, tracts and nuclei that sense and help coordinate head movement. Sense position and movement of the head in space and then evokes appropriate adjustments in posture, muscle tone and eye position to maintain balance. Head movement had 6 degrees of freedom: 3 rotational and 3 linear (about the x, y, z axes). Balance is further maintained through coordination of vestibular information with vision with proprioceptors in muscles and joints. Contains the vestibule (containing the saccule and utricle) and the semicircular canals! Endolymph bathes the hair cells in the membranous labyrinth; it is high in k+ and made in the endolymphatic sac. Whereas, perilympth from the cns surrounds bony cavities; made from the. The saccule and utricle detect linear acceleration and head tilt; they are considered the static labirynth. Sensory hair cells are located in the utricle floor or saccule wall. A group of hair cells is a called a macula.
