;,.U ANATOMY IN A NUTSHELL. 



The external surface of the malar hone is convex and gives attachment 

 to the Zygomaticus major and the Zygomaticus minor. It has a malar fora- 

 men tor malar branch of temporo-malar nerve and vessels. 



lt> inner surface is concave and has a triangular rough surface for its artic- 

 ulation with the superior maxillary. It has a smooth concave surface ex- 

 ternally which forms part of the temporal fossa above and part of the zygo- 

 matic fossa below. This surface gives origin to the Masseter muscle. 



The orbital border, or antero-superior, forms part of the circumference of 

 the oribt. 



The maxillary border, or antero-inferior, articultaes with the superior 

 maxillary hone. The Levator labii superioris propius muscle is attached to 

 this border. 



The temporal border, or post em-superior, is a curved border. The tem- 

 poral fascia is attached to this border which is continuous with the temporal 

 ridge above and with the upper border of the zygomatic arch below. 



The zygomatic border, or postero-inferior, is continuous with the lower 

 border of the zygomatic arch and gives origin to the Masseter muscle. 



The maxillary process articulates with the superior maxillary bone. It is 

 rough ami triangular. 



The zygomatic process articulates with the zygomatic process of the tem- 

 poral hone. 



The frontal process articulates with the external angular process of the 

 frontal hone. 



The orbital process passes backward forming part of the floor and outer 

 wall of the orbit. It also forms part of the temporal fossa and bounds the 

 spheno-maxillary fissure anteriorly. It presents the inner opening of the tem- 

 poro-malar canals. 



Ossification.— From two or three centers. 



Articulation. — It articulates with four bones. The frontal, sphenoid, 

 and temporal of the cranium, ami the superior maxillary of the face. 



An \< iimi.vi of Muscles.— It has five muscles attached to it. Levator 

 labii superioris propius of the superior maxillary region, Zygomatic major and 

 Zygomatic minor of the superior maxillary region, the Masseter of the temporo- 

 maxillary region, Temporal of the temporo-maxillary region. 



Blood Supply. Interim' orbital, lachrymal branches of the ophthalmic, 

 transverse facial, and deep temporal arteries. 



Levator labii superioris proprius. — 



Origin.- From the superior maxillary bone above the infraorbital foramen, 

 al.-o from the lower border of the maxillary process of the malar bone. 



Insertion. Into the facial part of the Orbicularis oris. 



\> i [ON. To elevate ami protrude the lip. 



\'l.l;\ l. Si PPL1 . facial nerve. 



Blood Supply. Branchesfrom the facial artery. 



The infraorbital plexus, which is formed by the fifth and seventh nerves 

 and the anastomosis of the infraorbital and facial arteries, are beneath this 

 muscle. 



