THE ABDOMINAL WALLS 



245 



The uppermost fibres are inserted into the lower ribs and their 

 cartilages ; the intermediate fibres form an aponeurosis, which is 

 inserted into the linea alba ; the lowest fibres arch over the 

 spermatic cord and are inserted behind it as it leaves the inguinal 



Greater occipital nerve 



Third occipital nerve 



Sterno-mastoid 



Lesser occipital nerve 



Trapezius 



Deltoid 



Semispinalis capitis (O.T. complexus) 



Splenius capitis 

 Cervical nerves to trapezius 

 Accessory nerve 



Ascending br. of transverse cervic 

 Levator scapulae 



Descending br. of t 

 cervical artery and 

 scapulas nerve 



Rhomboideus rr 



_ Trapezius 

 (reflected) 



Rhomboideus 

 major 



Teres major 



Serratus ante 



Serratus posterior inferior 

 Latissimus dorsi 

 External oblique muscle 

 Trigonum lumbale (Petiti) 



Glutseus medius 

 Glutseus maximus 



FIG. 74. The Muscles on the Dorsal Aspect of the Trunk. 



canal. The latter blend with fibres of the transversus to form 

 the Falx Inguinalis Aponeurotica (Conjoined Tendon). 



The Transversus Abdominis is the deepest muscular layer 

 of the lateral abdominal wall. It arises (i) from the internal 

 surfaces of the lower six costal cartilages, interdigitating with 

 the diaphragm, so that the fascia on its deep surface 



16 a 



External divisions of 

 posterior rami of 

 lumbar nerves 



