28 



ANATOMY. 



transverse processes ; there are also four other shorter processes on 

 each movable vertebra, two above and two below, called the articular 

 processes (articulum, a little joint), by which the several bones are 

 still further joined together. The only part which now concerns us is 



Fig. 10. 



Fig. 10. Right side of the bones of the trunk. 

 1 to 5 is the spinal column; 1, the cervix or 

 neck, consisting of seven cervical vertebrae. 2, 

 from * to *, the dorsum or back, consisting of 

 twelve dorsal vertebrae; 3, the loins, consisting 

 of five lumbar vertebrae ; 4, the sacrum, com- 

 posed of five consolidated sacral vertebrae ; and 

 5, the three or four imperfect vertebrae called 

 coccygeal. The twelve ribs of the right side are 

 also seen ; and the inner side of the sternum in 

 front. The right collar-bone is marked c/ the 

 right scapula s. The right hip-bone, or innomi- 

 nate bone, is indicated by three letters : i on the 

 part called the ilium, is on the ischium, and p 

 on the pubes. The large rounded deep hollow 

 cup where these three parts meet, is the acetab- 

 ulum or socket for the head of the thigh-bone ; 

 it contrasts with the small, oval, shallow depres- 

 sion in the scapula, named the glenoid cavity, 

 intended for the reception of the humerus 

 (From Nature.) 



the open vertebral ring : in the natural state it is the succession of 

 these rings which forms the spinal canal, Fig. 12, c, e. 



Now, the cavity of the skull contains the large, soft, pulpy organ 

 called the brain, which is itself composed of the cerebrum, or brain 

 proper, Fig. 12, a, and the cerebellum, or little brain, b. The cerebrum 

 and cerebellum are connected together at the under part or base of the 

 brain ; but, above, the cerebrum is parted into two lateral halves or 

 hemispheres, which are lodged one on each side of the falx, whilst, 

 below, the tentoriurn separates the cerebrum from the cerebellum. 

 The mechanical support thus afforded by the tentorium and the falx is 

 obvious enough. From the base of the brain there is sent down a thick, 



