Posterior to the bony closure of the prootic foramen, the ventromedial part of the pseudobasal process joins the prootic and forms the ventrolateral edge of the otic capsule. The posterior terminus of the medial branch of the pterygoid lies ventral to the lateral part of the otic capsule. The posterior branch of the otic process merges with the pterygoid process ventrally.
Figs. 16-17. Transverse sections through otic region: 16) at level of prootic foramen; 17) at level of anterior acoustic foramen. Abbreviations: angspl., angulosplenial; ant. acus. f., anterior acoustic foramen; cr. par., crista parotica; fpar., frontoparietal; max., maxillary; Mc. c., Meckel's cartilage; ot. cap., otic capsule; pasph., parasphenoid; pro., prootic; psdbas. proc., pseudobasal process; pter., pterygoid; pter. proc., pterygoid process; qj., quadratojugal; sq., squamosal; tect. syn., tectum synoticum; tymp. r., tympanic ring.
Figs. 18-19. Transverse sections through otic capsule: 18) at level of posterior acoustic foramen; 19) at level of jugular foramen. Abbreviations: angspl., angulosplenial; corn. prin., cornu principalis; cr. par., crista parotica; exocc., exoccipital; fpar., frontoparietal; jug. f., jugular foramen; max., maxillary; Mc. c., Meckel's cartilage; ot. cap., otic capsule; p. ext. pl., pars externa plectri; p. int. pl., pars interna plectri; p. med. pl., pars media plectri; pasph., parasphenoid; post. acus. f., posterior acoustic foramen; postlat. cr. par., posterolateral edge of crista parotica; pro., prootic; pter., pterygoid; pter. proc., pterygoid process; quad. proc., quadrate process; qj. quadratojugal; sq., squamosal; tect. syn., tectum synoticum; tymp. r., tympanic ring.