premaxiMa 



orbitosphenoid 

 orbitonasal foramen 

 ethmoid foramen 



lacrimal canal 

 infraorbital cana 



dermal petrosal parietal 



squamosal 



supraoccipital 



temporal 



canal 



maxillary turbina 

 nasal turbinal 

 ethmoid turbinal 



juga 



taenia clinorbitalis 

 sella turcica 



temporal cano 



jugular foramen 



occipital condyle' 



sphenopalatine foramen 



palatine cano 

 orbital fissure-foramen rotundum 

 IV, V|.,,VI 

 alar cano 



nasal septum 



ory nerve foramen 

 lobe chamber 

 ethmoid foramen 

 optic foramen 

 orbital fissure-foramen 

 carotid canal rotundur 

 foramen ovale 



anterior lacerate 

 fissure 



subarcuate fossa 



internal auditory meatus 



occipital 

 condyle 

 jugular foramen 

 crista parotica 



basisphenoid 



nuchal crest 



temporal crest 



temporal canal 



(posttemporol 



fenestra) 



glenoid 



-crista parotica 



... I . , x>' / \ --^ \ '^stylomastoid foramen 



occipital condy e '^ I ,,1^^/^ i • i 



^ ^ palatine ^°"'^' \ hyoid process 



Q ectopterygoid 



dorsum sellae 

 optic foramen 

 ethmoid foramen 

 ethmoid turbinal 

 nasal turbinal 



maxillary turbinal 



external naris 



orbital fissure-foramen rotundum 



foramen ovale 



anterior lacerate fissure 



hiatus facialis foramen 



prootic canal 



subarcuate fossa 



endolymphatic foramen 



nternal auditory meatus 

 jugular foramen 

 carotid foramen 

 (dashed outline) 



Figure 3-8. Skull and mandible of the Platypus {Ornifhorhynchus). A, lateral view of cranium with 

 zygomatic arch cut away; B, posterior view of cranium; C, dorsal view of skull with cranial roof 

 removed; D, medial view of right half of skull. 



MAMMALIAN HEAD SKELETON • 47 



