petrotympanic

The chorda tympani nerve passes through a canal (canal of Huguier), separated from the anterior edge of the petrotympanic fissure by a thin scale of bone and situated on the lateral side of the auditory tube, in the retiring angle between the squama and the petrous portion of the temporal.

II. Osteology. 5a. 4. The Temporal Bone 1918

The mandibular fossa (glenoid fossa) is bounded, in front, by the articular tubercle; behind, by the tympanic part of the bone, which separates it from the external acoustic meatus; it is divided into two parts by a narrow slit, the petrotympanic fissure (Glaserian fissure).

II. Osteology. 5a. 4. The Temporal Bone 1918

The iter chordæ anterius (canal of Huguier) is placed at the medial end of the petrotympanic fissure; through it the chorda tympani nerve leaves the tympanic cavity.

X. The Organs of the Senses and the Common Integument. 1d. 2. The Middle Ear or Tympanic Cavity 1918

Its upper border fuses laterally with the back of the postglenoid process, while medially it bounds the petrotympanic fissure.

II. Osteology. 5a. 4. The Temporal Bone 1918

The petrotympanic fissure (fissura petrotympanica; Glaserian fissure) opens just above and in front of the ring of bone into which the tympanic membrane is inserted; in this situation it is a mere slit about 2 mm. in length.

X. The Organs of the Senses and the Common Integument. 1d. 2. The Middle Ear or Tympanic Cavity 1918

The anterior ligament of the malleus (lig. mallei anterius) is attached by one end to the neck of the malleus, just above the anterior process, and by the other to the anterior wall of the tympanic cavity, close to the petrotympanic fissure, some of its fibers being prolonged through the fissure to reach the spina angularis of the sphenoid.

X. The Organs of the Senses and the Common Integument. 1d. 3. The Auditory Ossicles 1918

Lateral to the spina angularis is the mandibular fossa, divided into two parts by the petrotympanic fissure; the anterior portion, concave, smooth bounded in front by the articular tubercle, serves for the articulation of the condyle of the mandible; the posterior portion, rough and bounded behind by the tympanic part of the temporal, is sometimes occupied by a part of the parotid gland.

II. Osteology. 5c. The Exterior of the Skull 1918

Between the tympanic part and the articular tubercle is the mandibular fossa, divided into two parts by the petrotympanic fissure.

II. Osteology. 5c. The Exterior of the Skull 1918

The anterior process (processus anterior [Folii]; processus gracilis) is a delicate spicule, which springs from the eminence below the neck and is directed forward to the petrotympanic fissure, to which it is connected by ligamentous fibers.

X. The Organs of the Senses and the Common Integument. 1d. 3. The Auditory Ossicles 1918

This ring of bone is incomplete at its upper part, forming a notch (notch of Rivinus), close to which are three small apertures: the iter chordæ posterius, the petrotympanic fissure, and the iter chordæ anterius.

X. The Organs of the Senses and the Common Integument. 1d. 2. The Middle Ear or Tympanic Cavity 1918