A.NATOMY IN A NUTSHELL. 



25 



the joint and are covered with articular cartilage. This cartilage has no blood 

 vessels, is a hylaine variety, and is nourished by the lymph. These bones are 

 held together by ligaments (to bind) which are flexible but not extensible. 

 Joints, like muscles must have blood and nerve supply. 



Hilton's Law — A nerve trunk which snpplies a joint supplies the muscle 

 which moves the joint and the integument over the fullest insertion of the mus- 

 cle . The Circumflex nerve to the shoulder joint is a good example of this law. 



There are three great classes of joints in the body: 



A. Immovable or Synarthrosis. 



B. Partly movable or Amphiarthrosis. 

 ('. Freely movable or Diarthrosis. 



PLATE IV. 



ANT. PRIMARY BRANCH 



SPINAL NtHvb 



POSTERIOR PRIMARY BRANCH 



ANT OR VENTRAL R00T-M0TUR 



EXT. DIVISION 



INT DIVISION 



1 - GALL 6 - VENTRO LATERAL ASSOCIATION 



2 - BURDACK 7 - DEEP LATERAL ASSOCIATION 



3 - MARGINAL 9 - DIRECT PYRAMIDAL 



4 - DIRECT CEREBELLAR 9 - CROSSED PYRA MIOAL 



5 -ASCENDING LATERAL TRACT (GOWERSt 10 COMMA 



A Transverse Section of the Spinal Cord. 



Under (A) Synarthrosis we have the following: 



1. True sutures or sutura vera. 



a. Dentata ;is interparietal. 



b. Serrata as interfrontal. 



c. Limbosa as fronto-parietal. 



2. Sutura notha. 



a. Squamosa as squamo-parietal. 



b. Harmonia as intermaxillary. 



3. Schindylesis as the sphenoid with the vomer. 



4. Gomphosis, as the teeth. 



5. Synchondrosis, which means the union of bones by mean- of fibrous 

 or elastic cartilage, e. g. ; epiphyseal line.-. 



