Human Anatomy and Histology · MU Plovdiv

100. Internal ear. The bony and membranous labyrinth - vestibular part. Organ of equilibrium. Pathway of equilibrium.

Inside: 12 sections · 10 labelled pictures · 1 table · 20 flashcards · 7 min

Topic 100 of 138 in the MU Plovdiv syllabus for Human Anatomy and Histology (Dental Medicine, Year 1). The free AceMed note covers it in 11 sections, about 897 words (7 min of reading), with 20 flashcards.

In this note

  1. Vestibular pathway:
  2. Peripheral Vestibular System:
  3. Pathway
  4. Vestibular nuclei complex:
  5. Connections of the vestibular nuclei:
  6. INTERNAL EAR
  7. Bony Labyrinth:
  8. Membranous Labyrinth:
  9. VESTIBULAR LABYINTH (=vestibular system)
  10. COCHLEAR MEMBRANOUS LYBYINTH
  11. Componants:

Vestibular pathway:

  • The vestibular pathway is responsible for processing related to balance, spatial orientation, & head movement.
  • The vestibular system consists of both central & peripheral componants.

Peripheral Vestibular System:

  • Semicircular Canals: 3 fluid-filled canals within the inner ear, that detect rotational movements of the head.
  • Utricle & Saccule: within the inner ear, that detect linear accelerations & head position relative to gravity.

Pathway

  1. (1) Inner ear
  2. (2) Vestibular ganglion
  3. (3) Internal acustic meatus ← with cochlear br. + facial nerve.
  4. (4) Vestibular nuclei within the medulla

Connections of the vestibular nuclei:

4 connections:

  1. With the spinal cord (medial & lateral nuclei)
  2. " " cerebellum through the inferior cerebllar Peducle.
  3. with other brainstem nuclei (eye movement nuclei)
  4. " " thalamus.
  • vestibular n.
  • thalamus
  • spinal cord
  • lat. & Ant.
  • cerebellum
  • folleculonodula
  • oclumotor n.s
  • medial

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