Fig. 1. Left Temporal Bone of New-born Infant. Front View of Tympanic Membrane and Ossicles (B.). 1. Tympanic ring. 2. Notch of Rivinus. 3. Tympanic membrane. Fig. 2. Specimen No. 1. 1. Horizontal layer of squamous portion. 2. Roof of mastoid antrum. 3. Attic (epitympanic recess). 4. Malleus. 4. Prominence formed by short process of malleus. 5. Streak formed by manubrium. 6. Umbo. Seen from Within (B.). 5. Slender or Folian process in Glaserian fissure. 6. Incus. 7. Stapes. 8. Chorda tympani. 9. Anterior malleolar fold. 10. Posterior malleolar fold. Fig. 3. Left Temporal Bone of New-born Infant. Seen from Within (B.). 1. Petrosquamous suture. 2. Sigmoid groove. 3. External opening of the aquæductus vestibuli. 4. Eminentia arcuata. 5. Fossa subarcuata. 6. Prominence due to posterior semicircular canal. 7. Internal auditory meatus. 8. Foramen nervi facialis (area ves tibularis). 9. Superior cribriform area. 10. Middle cribriform area. 11. Foramen singulare. 12. Foramen centrale cochleare and spiral cribriform tract. 13. Falciform crest. 14. External orifice aquæductus cochleæ. Fig. 4. Chain of Ossicles. Lateral View. Right Side (× 3) (B.). Fig. 9. Malleus (1) with Tensor Tympani Muscle (2). Life Size. Pos terior View (B.). Fig. 10. Stapes (1) with Stapedius Muscle (2). Life Size (B.). |