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BOTANIC PHYSICIAN. 
The cellular membrane is formed of small membranous cells, which 
are sometimes distended with fat. Its situation is under the skit 
“and in some soft parts. Use, to cover and defend the muscles ; 10 
unite the soft parts ; and to render the muscular fibres flexible. 
re ae Es ee ee ee 
OF THE HEAD. 
_ The parts which form the head, are divided into external and in~ 
_ ternal. The external parts are, the common integuments ; hair; @ 
tendinous expansion ; three pair of muscles; the covering memir 
_ brane; and the skull itself The internal parts are, the outer mem- 
__ brane of the brain (dura mater); the web membrane, between the — 
- outer and inner ; the inner membrane (pia mater) ; the brain ; hind 
brain; oblong marrow ; nine pair of nerves ; four arteries, and twent 
four vein canals. ee 
Outer Membrane—A thick membrane, which strongly adheres | 
the internal surface of the skull, especially about the sutures, Its 
esses are, the scythe process, which divides the two hemispheres 
'the brain ; the partition which separates the brain from the hindel 
brain ; and the partition separating the two lobes of the hinder brai 
It is composed of two strong layers, adhering together by fibrous 
re. Its arteries are, the front, middle, and back, The veins 
ror — — in number they are twenty-two, the p 
a ich are, the upper itudinal, si ad lower Jon 
inal; all of whict ac ppe longitudina , side, and lo g 
base of the skull, into the internal jugular veins. It has 
_Its use is, to form: the internal lining of the skull, and 
fend the brain and internal parts from compression. 
very delicate and transparent ; situated 
es. It is very thin and fila 
nerves. Use, not known- 
nd contain the 
of the skull. Its shape is 
‘o his size, than in any other 
~..-4 into two hemispheres, 
