THE CRANIAL FORAMINA. 35 



Foremen Lacerum Medium, q internal carotid artery, carotid plexus, large 



p^trosal nerve, and a branch from the ascending pharyngeal artery. 

 Small Foramen, lesser petrosal nerve. 

 Hiatus Fallopii, large petrosal nerve, branch of middle meningeaJ artery. 



Posterior Fossa contains 6 pairs and I single, viz. 



Meatus Auditorius Internus, facial and auditory nerves, auditory artery. 

 Aqueductus Vestibuli, small artery and vein, process of dura mater. 

 Foramen Lacerum Posterius, r glosso-pharyngeal, pneumo-gastric, and spinal 



accessory nerves, internal jugular vein, meningeal branches of the ascend 



ing pharyngeal and occipital arteries. 

 Mastoid Foramen (often absent), small vein, occasionally the mastoid 



artery. 

 Anterior Condyloid Foramen, hypoglossal nerve, meningeal branch from 



the ascending pharyngeal artery. 



Posterior Condyloid Foramen (often absent), posterior condyloid vein. 

 Foramen Magnum, k medulla oblongata and its membranes, the vertebral 



arteries, and the spinal accessory nerves. 



Externally, at the base of the skull are 10 pairs, viz. 

 Opening of the Eustachian Tube, air to the middle ear. 

 Opening of Tensor Tympani Canal, the tensor tympani muscle. 

 Orifice of the Vidian Canal, the Vidian nerve, and vessels. 

 Glasserian Fissure,* laxator tympani muscle, tympanic artery, processus 



gracilis of the malleus. 



Orifice of the Canal of Hugier, chorda tympani nerve. 

 Foramen for Jacobsoris Nerve, tympanic branch of glosso-pharyngeal. 

 Foramen for Arnold' 's Nerve, auricular branch of pneumogastric. 

 Opening of the Aqueductus Cochleae, vein to the cochlea. 

 Stylo-mastoid Foramen / facial nerve, stylo-mastoid artery. 

 Auricular Fissure, exit of Arnold's nerve. 



Face presents 3 pairs, viz. 



Supraorbital Foramen or Notch, supraorbital artery, vein, and nerve. 

 Infraorbital Foramen, infraorbital artery and nerve. 

 Menial Foramen, mental artery and nerve. 



Palate presents, on each side at least 6 pairs, viz. 



Incisive Foramina^ (one or two), nerves and vessels to the incisor teeth. 

 2 Anterior Palatine, anterior palatine vessels, naso-palatine nerves. 

 Posterior Palatine, posterior palatine vessels, anterior palatine nerve. 

 Accessory Palatine Foramina (one or two), posterior palatine nerves- 

 Ptcrygo-palatine Foramen^ pterygo-palatine vessels. 



