. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. BONES OF THE HEAD. 27 this surface is the zygomatic process,^ which forms a part of the zygo- matic arch. The base of this process is triangular, and has beneath it a cavity called glenoid for the articulation of the lower jaw. This cavity is separated by the Glaserian fissure from another behind it, containing a portion of the parotid gland. Through this fissure pass the chorda tympani nerve and the laxator tympani
. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. BONES OF THE HEAD. 27 this surface is the zygomatic process,^ which forms a part of the zygo- matic arch. The base of this process is triangular, and has beneath it a cavity called glenoid for the articulation of the lower jaw. This cavity is separated by the Glaserian fissure from another behind it, containing a portion of the parotid gland. Through this fissure pass the chorda tympani nerve and the laxator tympani muscle, attached to the processus gracilis of the malleus. The internal surface has a distinct groove* for the middle artery of the dura mater. The edge is thin and cutting and has flat serrations^ for the parietal bone. The mastoid? portion is behind, and nipple-like. It is thick and cellular; the cells being lined by a thin membrane. Ex- ternally it is rough, and has a large process called mastoid^ into which are inserted the sterno-cleido-mastoid and tra- chelo-mastoid muscles. Be- neaih this process is the di- gastric fossa ^'^ which gives ori- gin to the digastric niliscle. Internally is a deep sulcus^ containing a part of the lateral sinus. The edges are thick and dentate. Near the upper edge is the mastoid foramen, which transmits a vein, one of the emissaries of Santorini. The petrous^ portion is pyramidal and directed obliquely forwards and inwards. Its structure is extremely dense and brittle. The base has a large oval opening externally, betweeen the zygo- matic and mastoid, called the external meatus, which is surrounded by a rim called the auditory process, to which is attached the carti- laginous portion of the ear. In the foetus it is a ring. The apeo: is obtuse and is perforated by the carotid canal and foramen lacerum. In the angle between the apex and squamous portion, is the bony por- tion of the Eustachian tube, and above it a canal for the tensor tympani mu
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