ANATOMY IN A NUTSHELL. 



461 



muscle is the most superficial and the largesl muscle in the superficial abdominal 

 region. It is situated on the side and front part of the abdomen. The side of 

 the muscle consists of muscular fibers and its anterior part of aponeurotic 

 fibers. The aponeurosis of this muscle is strong but thin, and its fibers pass 

 obliquely downward and inward. At the linea alba, or median line of the ab- 

 domen, it joins the aponeurosis of its fellow. It is connected to the lower 

 border of the Pectoralis major above and below its attachment extends from 

 the anterior superior spine of the ilium to the spine of the os pubes ami theilio- 

 pectineal line, thus forming Poupart's ligament. 



Okigin. — From the external surface and the lower borders of the eight 

 lower ribs. The attachment of the digitations run downward and backward. 

 The first five of these digitations, which increase in size from above downward. 



PLATE CCXLIX. 



CANAL FOR JACOBSON'S NERVE 

 AQUAIDUCTUS COCHLEAR 

 CANAL FOR ARNOLD'S NERVE 

 JUGULAR FOSSA 

 VAGINAL PROCESS. 

 STYLOID PROCESS. 

 STYLO-MASTOID FOR AM E 

 JUGULAR SURFACE. 

 OCCIPITAL GROOVE.^ 

 DIGASTRIC 

 FOSSA. 



OPENING OF CAROTED GANAL. 

 QUAPLAT'L ROUGH SURFACE 

 TENSOR TYMPANI MUSCLE 

 LEVATOR PALATI 

 CANAL FOR EUSTACHIAN TUBE 

 AND,.TENSOR TYMPANI MUS. 



STYLO-PHARYNGEUS 

 EMINENTIA 

 ARTICULARIS 



The Inferior Surface of Petrous Portion of Temporal Bonf. 



are received between the corresponding processes of the Serratus magnus mus- 

 cle, while the last three digitations which diminish in size from above down- 

 ward interdigitate with processes of the Latissimus dorsi muscle. 



Insertion. — Into the anterior half of th( out< r lip of the cr< si of I he ilium, 

 and into the aponeurosis of the muscle extending from the prominence of the 

 ninth costal cartilage to the anterior superior spinous process of the ilium. 



Action. — To compress the viscera. To flex the thorax on the pelvis or 

 to flex the pelvis on the thorax. These muscles of the abdominal wall assisl 

 in micturition, defecation, and parturition. 



Nerve Supply.— Lower intercostals, 



BLOOD SUPPLY. — Intercostal and lumbar arteries. 



Obliquus interims, also called Ascending oblique. Description. This 

 muscle lies bfeneath the External oblique and is smaller and thinner than that 

 muscle. 



Origin.- From the outer half of Poupart's ligament, from the anterior 



