£  ~  BOTANIC-PHYSICIAN: = 
- * 
OF THE HEAD. 
"Phe head is divided into the skull and face. 
= : -THE SKULL. | 
_" The shape is various according to the customs of different nations, 
the bones of the infant being so tender as to be moulded into 
almost any form. It consists of eight bones: one forming the fore- 
_ head, two forming the top and sides of the head, two forming the 
temples, one forming the back part of the head, one wedge-shaped 
3 in the-middle of the base of the skullyyand-one sicye-shaped, behind 
the root of the nose. : i ni ; 
- Upon examining the upper part of a skull externally, several zig- 
| zag lines are perceptible; that which extends across from one tem- 
ie over to the other is called the crowning suture, and unites the 
: Sheed bones to the two which form the top and sides of the head; 
that which proceeds from behind one ear over across to the other, 
is the back suture, connecting the hinder bone to the side bones of 
the head ; and the suture extending from the crowning suture to the 
back suture, is called the arrow-shaped. These are sometimes called 
the true sutures, to distinguish them from the two spurious sutures, 
which unite the temple bones to the sides of the head. There are 
several prominences on the upper part of the skul! ; twoin the fore- 
head bones, one over each eye, one in the middle of each bone form- 
‘ing the sides of the head, and one in the centre ofthe hinder bone. 
These eminences point out the centre of ossification in these bones. 
ane On the internal surface of the upper part of the skull are a num- 
3 ber of grooves formed by the spinous artery of the outer membrane 
: ofthe brain. The sutures are here in the form of a line, not dove- 
tailed, and the whole surface is more polished than the external. 4 
___The bones forming the upper part of the skull consist of anexter- 
nal and an internal table, of a compact structure, and a spongy inter- 
Me 2 
