PHYSIOLOGY, AND PATHOLOGY OF THE CHIMPANZEE. 415 



plexus, which breaks up into gastric (G.P), splenic (S.P), and 

 hepatic (H.P) plexuses. It sends off the superior mesenteric 

 (S.M.P), left renal (L.R.P) and left suprarenal (L.S.R.P) 

 plexuses. 



F. Inferior Mesenteric Plexus (I.M.P):— A well-marked 

 ganglion (I.M.G) is present. It supplies the descending colon 

 and rectum and communicates with the left abdominal sympa- 

 thetic cord. 



The right cceliac ganglion (R.S.G) receives the great 

 splanchnic nerve. It is connected to the left ganglion by 

 several communicating nerves. Offshoots go into the cceliac, 

 right renal and superior mesenteric plexuses. 



G. The right and left renal plexuses (L.R.P. and R.R.P) are 

 offshoots of the corresponding halves of the solar plexus. They 

 receive splanchnic nerves and branches from the abdominal 

 sympathetic cords. 



H. The ovarian plexuses (O.P) are offshoots of the abdominal 

 sympathetic ganglia. 



The Eye and its Appendages (text-iig. 27). 



The skin over the supraorbital margin has a few long hairs 

 running in diffei^ent directions, but there are no pi^onounced 

 eyebrows. The upper lid is longer than the lower, and has 

 longer cilia. The Meibomian glands form projections on the 

 back of the lid, but a strip of darkly-coloured conjunctiva prevents 

 them from forming ridges on the ocular surface of the lid. The 

 capacious lacus lachrymalis is lined by black conjunctiva. No 

 caruncula is present, but the plica semilunaris is well marked. 

 The bulbar conjunctiva is dark in colour, but only the marginal 

 part of the palpebral conjunctiva is pigmented. The lower 

 lachrymal papilla is larger than the upper one, and the internal 

 tarsal ligament is larger than the lateral tarsal raphe. 



The lachrymal gland is small and flat, and consists of tAvo 

 parts as in Man. The ducts open into the superior conjunctival 

 fornix. And the naso-lachrymal duct opens below the inferior 

 turbinate bone into the middle of the inferior nasal meatus 

 (PI. II. fig. A). The gland is deeply embedded in thick fat. 



The fascia is very strong, and is attached as in Man to the 

 tarsal ligaments. 



Orbital Muscles: — The levator palpehrce superioris ai-ises as in 

 Man. But it has only two insertions — into the tarsus and 

 conjunctiva — instead of three. It is supplied by the third nerve 

 as in Man. The frontal nerve is far internal to it. The 

 superior oblique arises as in Man, and the trochlea is well 

 developed. Its long, fan-shaped tendon is inserted into the 

 eyeball distinctly to the outer side. It passes under the superior 

 rectus. The fourth nerve supplies it by three branches. The 

 rectus superior arises, and is inserted, as in Man. As its 

 insertion the ocular surface plays upon the anterior border of the 



