Superior semicircular canal
Lateral semicircular canal
111 segment (vertical, mastoid) of facial canal
III segment (vertical, mastoid) of facial canal
Stylomastoid foramen Sigmoid sinus Condylar canal
Occipital condyle Lateral mass of atlas
Glossopharyngeal (IX Cranial Nerve), Vagus (X Cranial Nerve), Accessory (XI Cranial Nerve), Hypoglossal (XII Cranial Nerve) Nerves
The ninth (glossopharyngeal) and tenth (vagus) nerves arise from the upper part of the medulla, lateral to the olive. The eleventh (accessory) emerges behind or lateral to the olive, with several fibers extended along most of the medulla length. The twelfth (hypoglossal) nerve emerges from the anterolateral (preolivary) sulcus at the lower part of the medulla.
The IX, X and XI cranial nerves reach the pars nervosa of the jugular foramen, while the XII cranial nerve exits the skull through the hypoglossal canal.
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